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-rw-r--r--third_party/abseil_cpp/absl/flags/BUILD.bazel514
-rw-r--r--third_party/abseil_cpp/absl/flags/CMakeLists.txt451
-rw-r--r--third_party/abseil_cpp/absl/flags/commandlineflag.cc34
-rw-r--r--third_party/abseil_cpp/absl/flags/commandlineflag.h200
-rw-r--r--third_party/abseil_cpp/absl/flags/commandlineflag_test.cc231
-rw-r--r--third_party/abseil_cpp/absl/flags/config.h87
-rw-r--r--third_party/abseil_cpp/absl/flags/config_test.cc61
-rw-r--r--third_party/abseil_cpp/absl/flags/declare.h65
-rw-r--r--third_party/abseil_cpp/absl/flags/flag.cc38
-rw-r--r--third_party/abseil_cpp/absl/flags/flag.h396
-rw-r--r--third_party/abseil_cpp/absl/flags/flag_benchmark.cc159
-rw-r--r--third_party/abseil_cpp/absl/flags/flag_test.cc906
-rw-r--r--third_party/abseil_cpp/absl/flags/flag_test_defs.cc24
-rw-r--r--third_party/abseil_cpp/absl/flags/internal/commandlineflag.cc26
-rw-r--r--third_party/abseil_cpp/absl/flags/internal/commandlineflag.h68
-rw-r--r--third_party/abseil_cpp/absl/flags/internal/flag.cc568
-rw-r--r--third_party/abseil_cpp/absl/flags/internal/flag.h775
-rw-r--r--third_party/abseil_cpp/absl/flags/internal/parse.h59
-rw-r--r--third_party/abseil_cpp/absl/flags/internal/path_util.h62
-rw-r--r--third_party/abseil_cpp/absl/flags/internal/path_util_test.cc46
-rw-r--r--third_party/abseil_cpp/absl/flags/internal/private_handle_accessor.cc65
-rw-r--r--third_party/abseil_cpp/absl/flags/internal/private_handle_accessor.h61
-rw-r--r--third_party/abseil_cpp/absl/flags/internal/program_name.cc60
-rw-r--r--third_party/abseil_cpp/absl/flags/internal/program_name.h50
-rw-r--r--third_party/abseil_cpp/absl/flags/internal/program_name_test.cc61
-rw-r--r--third_party/abseil_cpp/absl/flags/internal/registry.h97
-rw-r--r--third_party/abseil_cpp/absl/flags/internal/usage.cc524
-rw-r--r--third_party/abseil_cpp/absl/flags/internal/usage.h104
-rw-r--r--third_party/abseil_cpp/absl/flags/internal/usage_test.cc493
-rw-r--r--third_party/abseil_cpp/absl/flags/marshalling.cc241
-rw-r--r--third_party/abseil_cpp/absl/flags/marshalling.h264
-rw-r--r--third_party/abseil_cpp/absl/flags/marshalling_test.cc904
-rw-r--r--third_party/abseil_cpp/absl/flags/parse.cc823
-rw-r--r--third_party/abseil_cpp/absl/flags/parse.h60
-rw-r--r--third_party/abseil_cpp/absl/flags/parse_test.cc929
-rw-r--r--third_party/abseil_cpp/absl/flags/reflection.cc337
-rw-r--r--third_party/abseil_cpp/absl/flags/reflection.h90
-rw-r--r--third_party/abseil_cpp/absl/flags/reflection_test.cc267
-rw-r--r--third_party/abseil_cpp/absl/flags/usage.cc65
-rw-r--r--third_party/abseil_cpp/absl/flags/usage.h43
-rw-r--r--third_party/abseil_cpp/absl/flags/usage_config.cc164
-rw-r--r--third_party/abseil_cpp/absl/flags/usage_config.h134
-rw-r--r--third_party/abseil_cpp/absl/flags/usage_config_test.cc205
43 files changed, 0 insertions, 10811 deletions
diff --git a/third_party/abseil_cpp/absl/flags/BUILD.bazel b/third_party/abseil_cpp/absl/flags/BUILD.bazel
deleted file mode 100644
index 78d6da74d819..000000000000
--- a/third_party/abseil_cpp/absl/flags/BUILD.bazel
+++ /dev/null
@@ -1,514 +0,0 @@
-#
-# Copyright 2019 The Abseil Authors.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-
-load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_library", "cc_test")
-load(
-    "//absl:copts/configure_copts.bzl",
-    "ABSL_DEFAULT_COPTS",
-    "ABSL_DEFAULT_LINKOPTS",
-    "ABSL_TEST_COPTS",
-)
-
-package(default_visibility = ["//visibility:public"])
-
-licenses(["notice"])
-
-cc_library(
-    name = "path_util",
-    hdrs = [
-        "internal/path_util.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    visibility = [
-        "//absl/flags:__pkg__",
-    ],
-    deps = [
-        "//absl/base:config",
-        "//absl/strings",
-    ],
-)
-
-cc_library(
-    name = "program_name",
-    srcs = [
-        "internal/program_name.cc",
-    ],
-    hdrs = [
-        "internal/program_name.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    visibility = [
-        "//absl/flags:__pkg__",
-    ],
-    deps = [
-        ":path_util",
-        "//absl/base:config",
-        "//absl/base:core_headers",
-        "//absl/strings",
-        "//absl/synchronization",
-    ],
-)
-
-cc_library(
-    name = "config",
-    srcs = [
-        "usage_config.cc",
-    ],
-    hdrs = [
-        "config.h",
-        "usage_config.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":path_util",
-        ":program_name",
-        "//absl/base:config",
-        "//absl/base:core_headers",
-        "//absl/strings",
-        "//absl/synchronization",
-    ],
-)
-
-cc_library(
-    name = "marshalling",
-    srcs = [
-        "marshalling.cc",
-    ],
-    hdrs = [
-        "marshalling.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        "//absl/base:config",
-        "//absl/base:core_headers",
-        "//absl/base:log_severity",
-        "//absl/strings",
-        "//absl/strings:str_format",
-    ],
-)
-
-cc_library(
-    name = "commandlineflag_internal",
-    srcs = [
-        "internal/commandlineflag.cc",
-    ],
-    hdrs = [
-        "internal/commandlineflag.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        "//absl/base:config",
-        "//absl/base:fast_type_id",
-    ],
-)
-
-cc_library(
-    name = "commandlineflag",
-    srcs = [
-        "commandlineflag.cc",
-    ],
-    hdrs = [
-        "commandlineflag.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":commandlineflag_internal",
-        "//absl/base:config",
-        "//absl/base:fast_type_id",
-        "//absl/strings",
-        "//absl/types:optional",
-    ],
-)
-
-cc_library(
-    name = "private_handle_accessor",
-    srcs = [
-        "internal/private_handle_accessor.cc",
-    ],
-    hdrs = [
-        "internal/private_handle_accessor.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    visibility = [
-        "//absl/flags:__pkg__",
-    ],
-    deps = [
-        ":commandlineflag",
-        ":commandlineflag_internal",
-        "//absl/base:config",
-        "//absl/strings",
-    ],
-)
-
-cc_library(
-    name = "reflection",
-    srcs = [
-        "reflection.cc",
-    ],
-    hdrs = [
-        "internal/registry.h",
-        "reflection.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":commandlineflag",
-        ":commandlineflag_internal",
-        ":config",
-        ":private_handle_accessor",
-        "//absl/base:config",
-        "//absl/base:core_headers",
-        "//absl/container:flat_hash_map",
-        "//absl/strings",
-        "//absl/synchronization",
-    ],
-)
-
-cc_library(
-    name = "flag_internal",
-    srcs = [
-        "internal/flag.cc",
-    ],
-    hdrs = [
-        "internal/flag.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    visibility = ["//absl/base:__subpackages__"],
-    deps = [
-        ":commandlineflag",
-        ":commandlineflag_internal",
-        ":config",
-        ":marshalling",
-        ":reflection",
-        "//absl/base",
-        "//absl/base:config",
-        "//absl/base:core_headers",
-        "//absl/memory",
-        "//absl/meta:type_traits",
-        "//absl/strings",
-        "//absl/synchronization",
-        "//absl/utility",
-    ],
-)
-
-cc_library(
-    name = "flag",
-    srcs = [
-        "flag.cc",
-    ],
-    hdrs = [
-        "declare.h",
-        "flag.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":config",
-        ":flag_internal",
-        ":reflection",
-        "//absl/base",
-        "//absl/base:config",
-        "//absl/base:core_headers",
-        "//absl/strings",
-    ],
-)
-
-cc_library(
-    name = "usage_internal",
-    srcs = [
-        "internal/usage.cc",
-    ],
-    hdrs = [
-        "internal/usage.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    visibility = [
-        "//absl/flags:__pkg__",
-    ],
-    deps = [
-        ":commandlineflag",
-        ":config",
-        ":flag",
-        ":flag_internal",
-        ":path_util",
-        ":private_handle_accessor",
-        ":program_name",
-        ":reflection",
-        "//absl/base:config",
-        "//absl/base:core_headers",
-        "//absl/strings",
-    ],
-)
-
-cc_library(
-    name = "usage",
-    srcs = [
-        "usage.cc",
-    ],
-    hdrs = [
-        "usage.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":usage_internal",
-        "//absl/base:config",
-        "//absl/base:core_headers",
-        "//absl/strings",
-        "//absl/synchronization",
-    ],
-)
-
-cc_library(
-    name = "parse",
-    srcs = ["parse.cc"],
-    hdrs = [
-        "internal/parse.h",
-        "parse.h",
-    ],
-    copts = ABSL_DEFAULT_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":commandlineflag",
-        ":commandlineflag_internal",
-        ":config",
-        ":flag",
-        ":flag_internal",
-        ":private_handle_accessor",
-        ":program_name",
-        ":reflection",
-        ":usage",
-        ":usage_internal",
-        "//absl/base:config",
-        "//absl/base:core_headers",
-        "//absl/strings",
-        "//absl/synchronization",
-    ],
-)
-
-############################################################################
-# Unit tests in alphabetical order.
-
-cc_test(
-    name = "commandlineflag_test",
-    size = "small",
-    srcs = [
-        "commandlineflag_test.cc",
-    ],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":commandlineflag",
-        ":commandlineflag_internal",
-        ":config",
-        ":flag",
-        ":private_handle_accessor",
-        ":reflection",
-        "//absl/memory",
-        "//absl/strings",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "config_test",
-    size = "small",
-    srcs = [
-        "config_test.cc",
-    ],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":config",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "flag_test",
-    size = "small",
-    srcs = [
-        "flag_test.cc",
-        "flag_test_defs.cc",
-    ],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":config",
-        ":flag",
-        ":flag_internal",
-        ":marshalling",
-        ":reflection",
-        "//absl/base:core_headers",
-        "//absl/base:malloc_internal",
-        "//absl/strings",
-        "//absl/time",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_binary(
-    name = "flag_benchmark",
-    testonly = 1,
-    srcs = [
-        "flag_benchmark.cc",
-    ],
-    copts = ABSL_TEST_COPTS,
-    tags = ["benchmark"],
-    visibility = ["//visibility:private"],
-    deps = [
-        ":flag",
-        ":marshalling",
-        ":parse",
-        ":reflection",
-        "//absl/strings",
-        "//absl/time",
-        "//absl/types:optional",
-        "@com_github_google_benchmark//:benchmark_main",
-    ],
-)
-
-cc_test(
-    name = "marshalling_test",
-    size = "small",
-    srcs = [
-        "marshalling_test.cc",
-    ],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":marshalling",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "parse_test",
-    size = "small",
-    srcs = [
-        "parse_test.cc",
-    ],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":flag",
-        ":parse",
-        ":reflection",
-        ":usage_internal",
-        "//absl/base:raw_logging_internal",
-        "//absl/base:scoped_set_env",
-        "//absl/strings",
-        "//absl/types:span",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "path_util_test",
-    size = "small",
-    srcs = [
-        "internal/path_util_test.cc",
-    ],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":path_util",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "program_name_test",
-    size = "small",
-    srcs = [
-        "internal/program_name_test.cc",
-    ],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":program_name",
-        "//absl/strings",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "reflection_test",
-    size = "small",
-    srcs = [
-        "reflection_test.cc",
-    ],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":commandlineflag_internal",
-        ":flag",
-        ":marshalling",
-        ":reflection",
-        ":usage_internal",
-        "//absl/memory",
-        "//absl/strings",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "usage_config_test",
-    size = "small",
-    srcs = [
-        "usage_config_test.cc",
-    ],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":config",
-        ":path_util",
-        ":program_name",
-        "//absl/strings",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-cc_test(
-    name = "usage_test",
-    size = "small",
-    srcs = [
-        "internal/usage_test.cc",
-    ],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    deps = [
-        ":config",
-        ":flag",
-        ":parse",
-        ":path_util",
-        ":program_name",
-        ":reflection",
-        ":usage",
-        ":usage_internal",
-        "//absl/strings",
-        "@com_google_googletest//:gtest",
-    ],
-)
diff --git a/third_party/abseil_cpp/absl/flags/CMakeLists.txt b/third_party/abseil_cpp/absl/flags/CMakeLists.txt
deleted file mode 100644
index e5083d7b9a87..000000000000
--- a/third_party/abseil_cpp/absl/flags/CMakeLists.txt
+++ /dev/null
@@ -1,451 +0,0 @@
-#
-# Copyright 2019 The Abseil Authors.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-
-# Internal-only target, do not depend on directly.
-absl_cc_library(
-  NAME
-    flags_path_util
-  HDRS
-    "internal/path_util.h"
-  COPTS
-    ${ABSL_DEFAULT_COPTS}
-  LINKOPTS
-    ${ABSL_DEFAULT_LINKOPTS}
-  DEPS
-    absl::config
-    absl::strings
-  PUBLIC
-)
-
-# Internal-only target, do not depend on directly.
-absl_cc_library(
-  NAME
-    flags_program_name
-  SRCS
-    "internal/program_name.cc"
-  HDRS
-    "internal/program_name.h"
-  COPTS
-    ${ABSL_DEFAULT_COPTS}
-  LINKOPTS
-    ${ABSL_DEFAULT_LINKOPTS}
-  DEPS
-    absl::config
-    absl::core_headers
-    absl::flags_path_util
-    absl::strings
-    absl::synchronization
-  PUBLIC
-)
-
-absl_cc_library(
-  NAME
-    flags_config
-  SRCS
-    "usage_config.cc"
-  HDRS
-    "config.h"
-    "usage_config.h"
-  COPTS
-    ${ABSL_DEFAULT_COPTS}
-  LINKOPTS
-    ${ABSL_DEFAULT_LINKOPTS}
-  DEPS
-    absl::config
-    absl::flags_path_util
-    absl::flags_program_name
-    absl::core_headers
-    absl::strings
-    absl::synchronization
-)
-
-absl_cc_library(
-  NAME
-    flags_marshalling
-  SRCS
-    "marshalling.cc"
-  HDRS
-    "marshalling.h"
-  COPTS
-    ${ABSL_DEFAULT_COPTS}
-  LINKOPTS
-    ${ABSL_DEFAULT_LINKOPTS}
-  DEPS
-    absl::config
-    absl::core_headers
-    absl::log_severity
-    absl::strings
-    absl::str_format
-)
-
-# Internal-only target, do not depend on directly.
-absl_cc_library(
-  NAME
-    flags_commandlineflag_internal
-  SRCS
-    "internal/commandlineflag.cc"
-  HDRS
-    "internal/commandlineflag.h"
-  COPTS
-    ${ABSL_DEFAULT_COPTS}
-  LINKOPTS
-    ${ABSL_DEFAULT_LINKOPTS}
-  DEPS
-    absl::config
-    absl::fast_type_id
-)
-
-absl_cc_library(
-  NAME
-    flags_commandlineflag
-  SRCS
-    "commandlineflag.cc"
-  HDRS
-    "commandlineflag.h"
-  COPTS
-    ${ABSL_DEFAULT_COPTS}
-  LINKOPTS
-    ${ABSL_DEFAULT_LINKOPTS}
-  DEPS
-    absl::config
-    absl::fast_type_id
-    absl::flags_commandlineflag_internal
-    absl::optional
-    absl::strings
-)
-
-# Internal-only target, do not depend on directly.
-absl_cc_library(
-  NAME
-    flags_private_handle_accessor
-  SRCS
-    "internal/private_handle_accessor.cc"
-  HDRS
-    "internal/private_handle_accessor.h"
-  COPTS
-    ${ABSL_DEFAULT_COPTS}
-  LINKOPTS
-    ${ABSL_DEFAULT_LINKOPTS}
-  DEPS
-    absl::config
-    absl::flags_commandlineflag
-    absl::flags_commandlineflag_internal
-    absl::strings
-)
-
-absl_cc_library(
-  NAME
-    flags_reflection
-  SRCS
-    "reflection.cc"
-  HDRS
-    "reflection.h"
-    "internal/registry.h"
-  COPTS
-    ${ABSL_DEFAULT_COPTS}
-  LINKOPTS
-    ${ABSL_DEFAULT_LINKOPTS}
-  DEPS
-    absl::config
-    absl::flags_commandlineflag
-    absl::flags_private_handle_accessor
-    absl::flags_config
-    absl::strings
-    absl::synchronization
-    absl::flat_hash_map
-)
-
-# Internal-only target, do not depend on directly.
-absl_cc_library(
-  NAME
-    flags_internal
-  SRCS
-    "internal/flag.cc"
-  HDRS
-    "internal/flag.h"
-  COPTS
-    ${ABSL_DEFAULT_COPTS}
-  LINKOPTS
-    ${ABSL_DEFAULT_LINKOPTS}
-  DEPS
-    absl::base
-    absl::config
-    absl::flags_commandlineflag
-    absl::flags_commandlineflag_internal
-    absl::flags_config
-    absl::flags_marshalling
-    absl::synchronization
-    absl::meta
-    absl::utility
-  PUBLIC
-)
-
-absl_cc_library(
-  NAME
-    flags
-  SRCS
-    "flag.cc"
-  HDRS
-    "declare.h"
-    "flag.h"
-  COPTS
-    ${ABSL_DEFAULT_COPTS}
-  LINKOPTS
-    ${ABSL_DEFAULT_LINKOPTS}
-  DEPS
-    absl::config
-    absl::flags_commandlineflag
-    absl::flags_config
-    absl::flags_internal
-    absl::flags_reflection
-    absl::base
-    absl::core_headers
-    absl::strings
-)
-
-# Internal-only target, do not depend on directly.
-absl_cc_library(
-  NAME
-    flags_usage_internal
-  SRCS
-    "internal/usage.cc"
-  HDRS
-    "internal/usage.h"
-  COPTS
-    ${ABSL_DEFAULT_COPTS}
-  LINKOPTS
-    ${ABSL_DEFAULT_LINKOPTS}
-  DEPS
-    absl::config
-    absl::flags_config
-    absl::flags
-    absl::flags_commandlineflag
-    absl::flags_internal
-    absl::flags_path_util
-    absl::flags_private_handle_accessor
-    absl::flags_program_name
-    absl::flags_reflection
-    absl::strings
-    absl::synchronization
-)
-
-absl_cc_library(
-  NAME
-    flags_usage
-  SRCS
-    "usage.cc"
-  HDRS
-    "usage.h"
-  COPTS
-    ${ABSL_DEFAULT_COPTS}
-  LINKOPTS
-    ${ABSL_DEFAULT_LINKOPTS}
-  DEPS
-    absl::config
-    absl::core_headers
-    absl::flags_usage_internal
-    absl::strings
-    absl::synchronization
-)
-
-absl_cc_library(
-  NAME
-    flags_parse
-  SRCS
-    "parse.cc"
-  HDRS
-    "internal/parse.h"
-    "parse.h"
-  COPTS
-    ${ABSL_DEFAULT_COPTS}
-  LINKOPTS
-    ${ABSL_DEFAULT_LINKOPTS}
-  DEPS
-    absl::config
-    absl::core_headers
-    absl::flags_config
-    absl::flags
-    absl::flags_commandlineflag
-    absl::flags_commandlineflag_internal
-    absl::flags_internal
-    absl::flags_private_handle_accessor
-    absl::flags_program_name
-    absl::flags_reflection
-    absl::flags_usage
-    absl::strings
-    absl::synchronization
-)
-
-############################################################################
-# Unit tests in alpahabetical order.
-
-absl_cc_test(
-  NAME
-    flags_commandlineflag_test
-  SRCS
-    "commandlineflag_test.cc"
-  COPTS
-    ${ABSL_TEST_COPTS}
-  DEPS
-    absl::flags
-    absl::flags_commandlineflag
-    absl::flags_commandlineflag_internal
-    absl::flags_config
-    absl::flags_private_handle_accessor
-    absl::flags_reflection
-    absl::memory
-    absl::strings
-    gtest_main
-)
-
-absl_cc_test(
-  NAME
-    flags_config_test
-  SRCS
-    "config_test.cc"
-  COPTS
-    ${ABSL_TEST_COPTS}
-  DEPS
-    absl::flags_config
-    gtest_main
-)
-
-absl_cc_test(
-  NAME
-    flags_flag_test
-  SRCS
-    "flag_test.cc"
-    "flag_test_defs.cc"
-  COPTS
-    ${ABSL_TEST_COPTS}
-  DEPS
-    absl::core_headers
-    absl::flags
-    absl::flags_config
-    absl::flags_internal
-    absl::flags_marshalling
-    absl::flags_reflection
-    absl::strings
-    absl::time
-    gtest_main
-)
-
-absl_cc_test(
-  NAME
-    flags_marshalling_test
-  SRCS
-    "marshalling_test.cc"
-  COPTS
-    ${ABSL_TEST_COPTS}
-  DEPS
-    absl::flags_marshalling
-    gtest_main
-)
-
-absl_cc_test(
-  NAME
-    flags_parse_test
-  SRCS
-    "parse_test.cc"
-  COPTS
-    ${ABSL_TEST_COPTS}
-  DEPS
-    absl::flags
-    absl::flags_parse
-    absl::flags_reflection
-    absl::flags_usage_internal
-    absl::raw_logging_internal
-    absl::scoped_set_env
-    absl::span
-    absl::strings
-    gmock_main
-)
-
-absl_cc_test(
-  NAME
-    flags_path_util_test
-  SRCS
-    "internal/path_util_test.cc"
-  COPTS
-    ${ABSL_TEST_COPTS}
-  DEPS
-    absl::flags_path_util
-    gtest_main
-)
-
-absl_cc_test(
-  NAME
-    flags_program_name_test
-  SRCS
-    "internal/program_name_test.cc"
-  COPTS
-    ${ABSL_TEST_COPTS}
-  DEPS
-    absl::flags_program_name
-    absl::strings
-    gtest_main
-)
-
-absl_cc_test(
-  NAME
-    flags_reflection_test
-  SRCS
-    "reflection_test.cc"
-  COPTS
-    ${ABSL_TEST_COPTS}
-  DEPS
-    absl::flags_commandlineflag_internal
-    absl::flags
-    absl::flags_reflection
-    absl::flags_usage
-    absl::memory
-    absl::strings
-    gmock_main
-)
-
-absl_cc_test(
-  NAME
-    flags_usage_config_test
-  SRCS
-    "usage_config_test.cc"
-  COPTS
-    ${ABSL_TEST_COPTS}
-  DEPS
-    absl::flags_config
-    absl::flags_path_util
-    absl::flags_program_name
-    absl::strings
-    gtest_main
-)
-
-absl_cc_test(
-  NAME
-    flags_usage_test
-  SRCS
-    "internal/usage_test.cc"
-  COPTS
-    ${ABSL_TEST_COPTS}
-  DEPS
-    absl::flags_config
-    absl::flags
-    absl::flags_path_util
-    absl::flags_program_name
-    absl::flags_parse
-    absl::flags_reflection
-    absl::flags_usage
-    absl::strings
-    gtest
-)
diff --git a/third_party/abseil_cpp/absl/flags/commandlineflag.cc b/third_party/abseil_cpp/absl/flags/commandlineflag.cc
deleted file mode 100644
index 9f3b4a5a28ef..000000000000
--- a/third_party/abseil_cpp/absl/flags/commandlineflag.cc
+++ /dev/null
@@ -1,34 +0,0 @@
-//
-// Copyright 2020 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/commandlineflag.h"
-
-#include <string>
-
-#include "absl/base/config.h"
-#include "absl/flags/internal/commandlineflag.h"
-#include "absl/strings/string_view.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-
-bool CommandLineFlag::IsRetired() const { return false; }
-bool CommandLineFlag::ParseFrom(absl::string_view value, std::string* error) {
-  return ParseFrom(value, flags_internal::SET_FLAGS_VALUE,
-                   flags_internal::kProgrammaticChange, *error);
-}
-
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/flags/commandlineflag.h b/third_party/abseil_cpp/absl/flags/commandlineflag.h
deleted file mode 100644
index f2fa08977fd4..000000000000
--- a/third_party/abseil_cpp/absl/flags/commandlineflag.h
+++ /dev/null
@@ -1,200 +0,0 @@
-//
-// Copyright 2020 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-// -----------------------------------------------------------------------------
-// File: commandlineflag.h
-// -----------------------------------------------------------------------------
-//
-// This header file defines the `CommandLineFlag`, which acts as a type-erased
-// handle for accessing metadata about the Abseil Flag in question.
-//
-// Because an actual Abseil flag is of an unspecified type, you should not
-// manipulate or interact directly with objects of that type. Instead, use the
-// CommandLineFlag type as an intermediary.
-#ifndef ABSL_FLAGS_COMMANDLINEFLAG_H_
-#define ABSL_FLAGS_COMMANDLINEFLAG_H_
-
-#include <memory>
-#include <string>
-
-#include "absl/base/config.h"
-#include "absl/base/internal/fast_type_id.h"
-#include "absl/flags/internal/commandlineflag.h"
-#include "absl/strings/string_view.h"
-#include "absl/types/optional.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-class PrivateHandleAccessor;
-}  // namespace flags_internal
-
-// CommandLineFlag
-//
-// This type acts as a type-erased handle for an instance of an Abseil Flag and
-// holds reflection information pertaining to that flag. Use CommandLineFlag to
-// access a flag's name, location, help string etc.
-//
-// To obtain an absl::CommandLineFlag, invoke `absl::FindCommandLineFlag()`
-// passing it the flag name string.
-//
-// Example:
-//
-//   // Obtain reflection handle for a flag named "flagname".
-//   const absl::CommandLineFlag* my_flag_data =
-//        absl::FindCommandLineFlag("flagname");
-//
-//   // Now you can get flag info from that reflection handle.
-//   std::string flag_location = my_flag_data->Filename();
-//   ...
-class CommandLineFlag {
- public:
-  constexpr CommandLineFlag() = default;
-
-  // Not copyable/assignable.
-  CommandLineFlag(const CommandLineFlag&) = delete;
-  CommandLineFlag& operator=(const CommandLineFlag&) = delete;
-
-  // absl::CommandLineFlag::IsOfType()
-  //
-  // Return true iff flag has type T.
-  template <typename T>
-  inline bool IsOfType() const {
-    return TypeId() == base_internal::FastTypeId<T>();
-  }
-
-  // absl::CommandLineFlag::TryGet()
-  //
-  // Attempts to retrieve the flag value. Returns value on success,
-  // absl::nullopt otherwise.
-  template <typename T>
-  absl::optional<T> TryGet() const {
-    if (IsRetired() || !IsOfType<T>()) {
-      return absl::nullopt;
-    }
-
-    // Implementation notes:
-    //
-    // We are wrapping a union around the value of `T` to serve three purposes:
-    //
-    //  1. `U.value` has correct size and alignment for a value of type `T`
-    //  2. The `U.value` constructor is not invoked since U's constructor does
-    //     not do it explicitly.
-    //  3. The `U.value` destructor is invoked since U's destructor does it
-    //     explicitly. This makes `U` a kind of RAII wrapper around non default
-    //     constructible value of T, which is destructed when we leave the
-    //     scope. We do need to destroy U.value, which is constructed by
-    //     CommandLineFlag::Read even though we left it in a moved-from state
-    //     after std::move.
-    //
-    // All of this serves to avoid requiring `T` being default constructible.
-    union U {
-      T value;
-      U() {}
-      ~U() { value.~T(); }
-    };
-    U u;
-
-    Read(&u.value);
-    // allow retired flags to be "read", so we can report invalid access.
-    if (IsRetired()) {
-      return absl::nullopt;
-    }
-    return std::move(u.value);
-  }
-
-  // absl::CommandLineFlag::Name()
-  //
-  // Returns name of this flag.
-  virtual absl::string_view Name() const = 0;
-
-  // absl::CommandLineFlag::Filename()
-  //
-  // Returns name of the file where this flag is defined.
-  virtual std::string Filename() const = 0;
-
-  // absl::CommandLineFlag::Help()
-  //
-  // Returns help message associated with this flag.
-  virtual std::string Help() const = 0;
-
-  // absl::CommandLineFlag::IsRetired()
-  //
-  // Returns true iff this object corresponds to retired flag.
-  virtual bool IsRetired() const;
-
-  // absl::CommandLineFlag::DefaultValue()
-  //
-  // Returns the default value for this flag.
-  virtual std::string DefaultValue() const = 0;
-
-  // absl::CommandLineFlag::CurrentValue()
-  //
-  // Returns the current value for this flag.
-  virtual std::string CurrentValue() const = 0;
-
-  // absl::CommandLineFlag::ParseFrom()
-  //
-  // Sets the value of the flag based on specified string `value`. If the flag
-  // was successfully set to new value, it returns true. Otherwise, sets `error`
-  // to indicate the error, leaves the flag unchanged, and returns false.
-  bool ParseFrom(absl::string_view value, std::string* error);
-
- protected:
-  ~CommandLineFlag() = default;
-
- private:
-  friend class flags_internal::PrivateHandleAccessor;
-
-  // Sets the value of the flag based on specified string `value`. If the flag
-  // was successfully set to new value, it returns true. Otherwise, sets `error`
-  // to indicate the error, leaves the flag unchanged, and returns false. There
-  // are three ways to set the flag's value:
-  //  * Update the current flag value
-  //  * Update the flag's default value
-  //  * Update the current flag value if it was never set before
-  // The mode is selected based on `set_mode` parameter.
-  virtual bool ParseFrom(absl::string_view value,
-                         flags_internal::FlagSettingMode set_mode,
-                         flags_internal::ValueSource source,
-                         std::string& error) = 0;
-
-  // Returns id of the flag's value type.
-  virtual flags_internal::FlagFastTypeId TypeId() const = 0;
-
-  // Interface to save flag to some persistent state. Returns current flag state
-  // or nullptr if flag does not support saving and restoring a state.
-  virtual std::unique_ptr<flags_internal::FlagStateInterface> SaveState() = 0;
-
-  // Copy-construct a new value of the flag's type in a memory referenced by
-  // the dst based on the current flag's value.
-  virtual void Read(void* dst) const = 0;
-
-  // To be deleted. Used to return true if flag's current value originated from
-  // command line.
-  virtual bool IsSpecifiedOnCommandLine() const = 0;
-
-  // Validates supplied value usign validator or parseflag routine
-  virtual bool ValidateInputValue(absl::string_view value) const = 0;
-
-  // Checks that flags default value can be converted to string and back to the
-  // flag's value type.
-  virtual void CheckDefaultValueParsingRoundtrip() const = 0;
-};
-
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_FLAGS_COMMANDLINEFLAG_H_
diff --git a/third_party/abseil_cpp/absl/flags/commandlineflag_test.cc b/third_party/abseil_cpp/absl/flags/commandlineflag_test.cc
deleted file mode 100644
index 585db4ba78a0..000000000000
--- a/third_party/abseil_cpp/absl/flags/commandlineflag_test.cc
+++ /dev/null
@@ -1,231 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/commandlineflag.h"
-
-#include <memory>
-#include <string>
-
-#include "gtest/gtest.h"
-#include "absl/flags/flag.h"
-#include "absl/flags/internal/commandlineflag.h"
-#include "absl/flags/internal/private_handle_accessor.h"
-#include "absl/flags/reflection.h"
-#include "absl/flags/usage_config.h"
-#include "absl/memory/memory.h"
-#include "absl/strings/match.h"
-#include "absl/strings/str_cat.h"
-#include "absl/strings/string_view.h"
-
-ABSL_FLAG(int, int_flag, 201, "int_flag help");
-ABSL_FLAG(std::string, string_flag, "dflt",
-          absl::StrCat("string_flag", " help"));
-ABSL_RETIRED_FLAG(bool, bool_retired_flag, false, "bool_retired_flag help");
-
-// These are only used to test default values.
-ABSL_FLAG(int, int_flag2, 201, "");
-ABSL_FLAG(std::string, string_flag2, "dflt", "");
-
-namespace {
-
-namespace flags = absl::flags_internal;
-
-class CommandLineFlagTest : public testing::Test {
- protected:
-  static void SetUpTestSuite() {
-    // Install a function to normalize filenames before this test is run.
-    absl::FlagsUsageConfig default_config;
-    default_config.normalize_filename = &CommandLineFlagTest::NormalizeFileName;
-    absl::SetFlagsUsageConfig(default_config);
-  }
-
-  void SetUp() override { flag_saver_ = absl::make_unique<absl::FlagSaver>(); }
-  void TearDown() override { flag_saver_.reset(); }
-
- private:
-  static std::string NormalizeFileName(absl::string_view fname) {
-#ifdef _WIN32
-    std::string normalized(fname);
-    std::replace(normalized.begin(), normalized.end(), '\\', '/');
-    fname = normalized;
-#endif
-    return std::string(fname);
-  }
-
-  std::unique_ptr<absl::FlagSaver> flag_saver_;
-};
-
-TEST_F(CommandLineFlagTest, TestAttributesAccessMethods) {
-  auto* flag_01 = absl::FindCommandLineFlag("int_flag");
-
-  ASSERT_TRUE(flag_01);
-  EXPECT_EQ(flag_01->Name(), "int_flag");
-  EXPECT_EQ(flag_01->Help(), "int_flag help");
-  EXPECT_TRUE(!flag_01->IsRetired());
-  EXPECT_TRUE(flag_01->IsOfType<int>());
-  EXPECT_TRUE(!flag_01->IsOfType<bool>());
-  EXPECT_TRUE(!flag_01->IsOfType<std::string>());
-  EXPECT_TRUE(absl::EndsWith(flag_01->Filename(),
-                             "absl/flags/commandlineflag_test.cc"))
-      << flag_01->Filename();
-
-  auto* flag_02 = absl::FindCommandLineFlag("string_flag");
-
-  ASSERT_TRUE(flag_02);
-  EXPECT_EQ(flag_02->Name(), "string_flag");
-  EXPECT_EQ(flag_02->Help(), "string_flag help");
-  EXPECT_TRUE(!flag_02->IsRetired());
-  EXPECT_TRUE(flag_02->IsOfType<std::string>());
-  EXPECT_TRUE(!flag_02->IsOfType<bool>());
-  EXPECT_TRUE(!flag_02->IsOfType<int>());
-  EXPECT_TRUE(absl::EndsWith(flag_02->Filename(),
-                             "absl/flags/commandlineflag_test.cc"))
-      << flag_02->Filename();
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(CommandLineFlagTest, TestValueAccessMethods) {
-  absl::SetFlag(&FLAGS_int_flag2, 301);
-  auto* flag_01 = absl::FindCommandLineFlag("int_flag2");
-
-  ASSERT_TRUE(flag_01);
-  EXPECT_EQ(flag_01->CurrentValue(), "301");
-  EXPECT_EQ(flag_01->DefaultValue(), "201");
-
-  absl::SetFlag(&FLAGS_string_flag2, "new_str_value");
-  auto* flag_02 = absl::FindCommandLineFlag("string_flag2");
-
-  ASSERT_TRUE(flag_02);
-  EXPECT_EQ(flag_02->CurrentValue(), "new_str_value");
-  EXPECT_EQ(flag_02->DefaultValue(), "dflt");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(CommandLineFlagTest, TestParseFromCurrentValue) {
-  std::string err;
-
-  auto* flag_01 = absl::FindCommandLineFlag("int_flag");
-  EXPECT_FALSE(
-      flags::PrivateHandleAccessor::IsSpecifiedOnCommandLine(*flag_01));
-
-  EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
-      *flag_01, "11", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange, err));
-  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 11);
-  EXPECT_FALSE(
-      flags::PrivateHandleAccessor::IsSpecifiedOnCommandLine(*flag_01));
-
-  EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
-      *flag_01, "-123", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange,
-      err));
-  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), -123);
-  EXPECT_FALSE(
-      flags::PrivateHandleAccessor::IsSpecifiedOnCommandLine(*flag_01));
-
-  EXPECT_TRUE(!flags::PrivateHandleAccessor::ParseFrom(
-      *flag_01, "xyz", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange,
-      err));
-  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), -123);
-  EXPECT_EQ(err, "Illegal value 'xyz' specified for flag 'int_flag'");
-  EXPECT_FALSE(
-      flags::PrivateHandleAccessor::IsSpecifiedOnCommandLine(*flag_01));
-
-  EXPECT_TRUE(!flags::PrivateHandleAccessor::ParseFrom(
-      *flag_01, "A1", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange, err));
-  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), -123);
-  EXPECT_EQ(err, "Illegal value 'A1' specified for flag 'int_flag'");
-  EXPECT_FALSE(
-      flags::PrivateHandleAccessor::IsSpecifiedOnCommandLine(*flag_01));
-
-  EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
-      *flag_01, "0x10", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange,
-      err));
-  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 16);
-  EXPECT_FALSE(
-      flags::PrivateHandleAccessor::IsSpecifiedOnCommandLine(*flag_01));
-
-  EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
-      *flag_01, "011", flags::SET_FLAGS_VALUE, flags::kCommandLine, err));
-  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 11);
-  EXPECT_TRUE(flags::PrivateHandleAccessor::IsSpecifiedOnCommandLine(*flag_01));
-
-  EXPECT_TRUE(!flags::PrivateHandleAccessor::ParseFrom(
-      *flag_01, "", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange, err));
-  EXPECT_EQ(err, "Illegal value '' specified for flag 'int_flag'");
-
-  auto* flag_02 = absl::FindCommandLineFlag("string_flag");
-  EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
-      *flag_02, "xyz", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange,
-      err));
-  EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "xyz");
-
-  EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
-      *flag_02, "", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange, err));
-  EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(CommandLineFlagTest, TestParseFromDefaultValue) {
-  std::string err;
-
-  auto* flag_01 = absl::FindCommandLineFlag("int_flag");
-
-  EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
-      *flag_01, "111", flags::SET_FLAGS_DEFAULT, flags::kProgrammaticChange,
-      err));
-  EXPECT_EQ(flag_01->DefaultValue(), "111");
-
-  auto* flag_02 = absl::FindCommandLineFlag("string_flag");
-
-  EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
-      *flag_02, "abc", flags::SET_FLAGS_DEFAULT, flags::kProgrammaticChange,
-      err));
-  EXPECT_EQ(flag_02->DefaultValue(), "abc");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(CommandLineFlagTest, TestParseFromIfDefault) {
-  std::string err;
-
-  auto* flag_01 = absl::FindCommandLineFlag("int_flag");
-
-  EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
-      *flag_01, "22", flags::SET_FLAG_IF_DEFAULT, flags::kProgrammaticChange,
-      err))
-      << err;
-  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 22);
-
-  EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
-      *flag_01, "33", flags::SET_FLAG_IF_DEFAULT, flags::kProgrammaticChange,
-      err));
-  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 22);
-  // EXPECT_EQ(err, "ERROR: int_flag is already set to 22");
-
-  // Reset back to default value
-  EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
-      *flag_01, "201", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange,
-      err));
-
-  EXPECT_TRUE(flags::PrivateHandleAccessor::ParseFrom(
-      *flag_01, "33", flags::SET_FLAG_IF_DEFAULT, flags::kProgrammaticChange,
-      err));
-  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 201);
-  // EXPECT_EQ(err, "ERROR: int_flag is already set to 201");
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/flags/config.h b/third_party/abseil_cpp/absl/flags/config.h
deleted file mode 100644
index 813a9257000f..000000000000
--- a/third_party/abseil_cpp/absl/flags/config.h
+++ /dev/null
@@ -1,87 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_FLAGS_CONFIG_H_
-#define ABSL_FLAGS_CONFIG_H_
-
-// Determine if we should strip string literals from the Flag objects.
-// By default we strip string literals on mobile platforms.
-#if !defined(ABSL_FLAGS_STRIP_NAMES)
-
-#if defined(__ANDROID__)
-#define ABSL_FLAGS_STRIP_NAMES 1
-
-#elif defined(__APPLE__)
-#include <TargetConditionals.h>
-#if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
-#define ABSL_FLAGS_STRIP_NAMES 1
-#elif defined(TARGET_OS_EMBEDDED) && TARGET_OS_EMBEDDED
-#define ABSL_FLAGS_STRIP_NAMES 1
-#endif  // TARGET_OS_*
-#endif
-
-#endif  // !defined(ABSL_FLAGS_STRIP_NAMES)
-
-#if !defined(ABSL_FLAGS_STRIP_NAMES)
-// If ABSL_FLAGS_STRIP_NAMES wasn't set on the command line or above,
-// the default is not to strip.
-#define ABSL_FLAGS_STRIP_NAMES 0
-#endif
-
-#if !defined(ABSL_FLAGS_STRIP_HELP)
-// By default, if we strip names, we also strip help.
-#define ABSL_FLAGS_STRIP_HELP ABSL_FLAGS_STRIP_NAMES
-#endif
-
-// ABSL_FLAGS_INTERNAL_ATOMIC_DOUBLE_WORD macro is used for using atomics with
-// double words, e.g. absl::Duration.
-// For reasons in bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80878, modern
-// versions of GCC do not support cmpxchg16b instruction in standard atomics.
-#ifdef ABSL_FLAGS_INTERNAL_ATOMIC_DOUBLE_WORD
-#error "ABSL_FLAGS_INTERNAL_ATOMIC_DOUBLE_WORD should not be defined."
-#elif defined(__clang__) && defined(__x86_64__) && \
-    defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_16)
-#define ABSL_FLAGS_INTERNAL_ATOMIC_DOUBLE_WORD 1
-#endif
-
-// ABSL_FLAGS_INTERNAL_HAS_RTTI macro is used for selecting if we can use RTTI
-// for flag type identification.
-#ifdef ABSL_FLAGS_INTERNAL_HAS_RTTI
-#error ABSL_FLAGS_INTERNAL_HAS_RTTI cannot be directly set
-#elif !defined(__GNUC__) || defined(__GXX_RTTI)
-#define ABSL_FLAGS_INTERNAL_HAS_RTTI 1
-#endif  // !defined(__GNUC__) || defined(__GXX_RTTI)
-
-// These macros represent the "source of truth" for the list of supported
-// built-in types.
-#define ABSL_FLAGS_INTERNAL_BUILTIN_TYPES(A) \
-  A(bool, bool)                              \
-  A(short, short)                            \
-  A(unsigned short, unsigned_short)          \
-  A(int, int)                                \
-  A(unsigned int, unsigned_int)              \
-  A(long, long)                              \
-  A(unsigned long, unsigned_long)            \
-  A(long long, long_long)                    \
-  A(unsigned long long, unsigned_long_long)  \
-  A(double, double)                          \
-  A(float, float)
-
-#define ABSL_FLAGS_INTERNAL_SUPPORTED_TYPES(A) \
-  ABSL_FLAGS_INTERNAL_BUILTIN_TYPES(A)         \
-  A(std::string, std_string)                   \
-  A(std::vector<std::string>, std_vector_of_string)
-
-#endif  // ABSL_FLAGS_CONFIG_H_
diff --git a/third_party/abseil_cpp/absl/flags/config_test.cc b/third_party/abseil_cpp/absl/flags/config_test.cc
deleted file mode 100644
index 638998667e70..000000000000
--- a/third_party/abseil_cpp/absl/flags/config_test.cc
+++ /dev/null
@@ -1,61 +0,0 @@
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/config.h"
-
-#ifdef __APPLE__
-#include <TargetConditionals.h>
-#endif
-
-#include "gtest/gtest.h"
-
-#ifndef ABSL_FLAGS_STRIP_NAMES
-#error ABSL_FLAGS_STRIP_NAMES is not defined
-#endif
-
-#ifndef ABSL_FLAGS_STRIP_HELP
-#error ABSL_FLAGS_STRIP_HELP is not defined
-#endif
-
-namespace {
-
-// Test that ABSL_FLAGS_STRIP_NAMES and ABSL_FLAGS_STRIP_HELP are configured how
-// we expect them to be configured by default. If you override this
-// configuration, this test will fail, but the code should still be safe to use.
-TEST(FlagsConfigTest, Test) {
-#if defined(__ANDROID__)
-  EXPECT_EQ(ABSL_FLAGS_STRIP_NAMES, 1);
-  EXPECT_EQ(ABSL_FLAGS_STRIP_HELP, 1);
-#elif defined(__myriad2__)
-  EXPECT_EQ(ABSL_FLAGS_STRIP_NAMES, 0);
-  EXPECT_EQ(ABSL_FLAGS_STRIP_HELP, 0);
-#elif defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
-  EXPECT_EQ(ABSL_FLAGS_STRIP_NAMES, 1);
-  EXPECT_EQ(ABSL_FLAGS_STRIP_HELP, 1);
-#elif defined(TARGET_OS_EMBEDDED) && TARGET_OS_EMBEDDED
-  EXPECT_EQ(ABSL_FLAGS_STRIP_NAMES, 1);
-  EXPECT_EQ(ABSL_FLAGS_STRIP_HELP, 1);
-#elif defined(__APPLE__)
-  EXPECT_EQ(ABSL_FLAGS_STRIP_NAMES, 0);
-  EXPECT_EQ(ABSL_FLAGS_STRIP_HELP, 0);
-#elif defined(_WIN32)
-  EXPECT_EQ(ABSL_FLAGS_STRIP_NAMES, 0);
-  EXPECT_EQ(ABSL_FLAGS_STRIP_HELP, 0);
-#elif defined(__linux__)
-  EXPECT_EQ(ABSL_FLAGS_STRIP_NAMES, 0);
-  EXPECT_EQ(ABSL_FLAGS_STRIP_HELP, 0);
-#endif
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/flags/declare.h b/third_party/abseil_cpp/absl/flags/declare.h
deleted file mode 100644
index b9794d8b85ac..000000000000
--- a/third_party/abseil_cpp/absl/flags/declare.h
+++ /dev/null
@@ -1,65 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-// -----------------------------------------------------------------------------
-// File: declare.h
-// -----------------------------------------------------------------------------
-//
-// This file defines the ABSL_DECLARE_FLAG macro, allowing you to declare an
-// `absl::Flag` for use within a translation unit. You should place this
-// declaration within the header file associated with the .cc file that defines
-// and owns the `Flag`.
-
-#ifndef ABSL_FLAGS_DECLARE_H_
-#define ABSL_FLAGS_DECLARE_H_
-
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-
-// absl::Flag<T> represents a flag of type 'T' created by ABSL_FLAG.
-template <typename T>
-class Flag;
-
-}  // namespace flags_internal
-
-// Flag
-//
-// Forward declaration of the `absl::Flag` type for use in defining the macro.
-#if defined(_MSC_VER) && !defined(__clang__)
-template <typename T>
-class Flag;
-#else
-template <typename T>
-using Flag = flags_internal::Flag<T>;
-#endif
-
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-// ABSL_DECLARE_FLAG()
-//
-// This macro is a convenience for declaring use of an `absl::Flag` within a
-// translation unit. This macro should be used within a header file to
-// declare usage of the flag within any .cc file including that header file.
-//
-// The ABSL_DECLARE_FLAG(type, name) macro expands to:
-//
-//   extern absl::Flag<type> FLAGS_name;
-#define ABSL_DECLARE_FLAG(type, name) extern ::absl::Flag<type> FLAGS_##name
-
-#endif  // ABSL_FLAGS_DECLARE_H_
diff --git a/third_party/abseil_cpp/absl/flags/flag.cc b/third_party/abseil_cpp/absl/flags/flag.cc
deleted file mode 100644
index 531df1287a17..000000000000
--- a/third_party/abseil_cpp/absl/flags/flag.cc
+++ /dev/null
@@ -1,38 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/flag.h"
-
-#include "absl/base/config.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-
-// This global mutex protects on-demand construction of flag objects in MSVC
-// builds.
-#if defined(_MSC_VER) && !defined(__clang__)
-
-namespace flags_internal {
-
-ABSL_CONST_INIT static absl::Mutex construction_guard(absl::kConstInit);
-
-absl::Mutex* GetGlobalConstructionGuard() { return &construction_guard; }
-
-}  // namespace flags_internal
-
-#endif
-
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/flags/flag.h b/third_party/abseil_cpp/absl/flags/flag.h
deleted file mode 100644
index a9cb2b7994d1..000000000000
--- a/third_party/abseil_cpp/absl/flags/flag.h
+++ /dev/null
@@ -1,396 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-// -----------------------------------------------------------------------------
-// File: flag.h
-// -----------------------------------------------------------------------------
-//
-// This header file defines the `absl::Flag<T>` type for holding command-line
-// flag data, and abstractions to create, get and set such flag data.
-//
-// It is important to note that this type is **unspecified** (an implementation
-// detail) and you do not construct or manipulate actual `absl::Flag<T>`
-// instances. Instead, you define and declare flags using the
-// `ABSL_FLAG()` and `ABSL_DECLARE_FLAG()` macros, and get and set flag values
-// using the `absl::GetFlag()` and `absl::SetFlag()` functions.
-
-#ifndef ABSL_FLAGS_FLAG_H_
-#define ABSL_FLAGS_FLAG_H_
-
-#include <string>
-#include <type_traits>
-
-#include "absl/base/attributes.h"
-#include "absl/base/config.h"
-#include "absl/base/optimization.h"
-#include "absl/flags/config.h"
-#include "absl/flags/internal/flag.h"
-#include "absl/flags/internal/registry.h"
-#include "absl/strings/string_view.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-
-// Flag
-//
-// An `absl::Flag` holds a command-line flag value, providing a runtime
-// parameter to a binary. Such flags should be defined in the global namespace
-// and (preferably) in the module containing the binary's `main()` function.
-//
-// You should not construct and cannot use the `absl::Flag` type directly;
-// instead, you should declare flags using the `ABSL_DECLARE_FLAG()` macro
-// within a header file, and define your flag using `ABSL_FLAG()` within your
-// header's associated `.cc` file. Such flags will be named `FLAGS_name`.
-//
-// Example:
-//
-//    .h file
-//
-//      // Declares usage of a flag named "FLAGS_count"
-//      ABSL_DECLARE_FLAG(int, count);
-//
-//    .cc file
-//
-//      // Defines a flag named "FLAGS_count" with a default `int` value of 0.
-//      ABSL_FLAG(int, count, 0, "Count of items to process");
-//
-// No public methods of `absl::Flag<T>` are part of the Abseil Flags API.
-#if !defined(_MSC_VER) || defined(__clang__)
-template <typename T>
-using Flag = flags_internal::Flag<T>;
-#else
-// MSVC debug builds do not implement initialization with constexpr constructors
-// correctly. To work around this we add a level of indirection, so that the
-// class `absl::Flag` contains an `internal::Flag*` (instead of being an alias
-// to that class) and dynamically allocates an instance when necessary. We also
-// forward all calls to internal::Flag methods via trampoline methods. In this
-// setup the `absl::Flag` class does not have constructor and virtual methods,
-// all the data members are public and thus MSVC is able to initialize it at
-// link time. To deal with multiple threads accessing the flag for the first
-// time concurrently we use an atomic boolean indicating if flag object is
-// initialized. We also employ the double-checked locking pattern where the
-// second level of protection is a global Mutex, so if two threads attempt to
-// construct the flag concurrently only one wins.
-// This solution is based on a recomendation here:
-// https://developercommunity.visualstudio.com/content/problem/336946/class-with-constexpr-constructor-not-using-static.html?childToView=648454#comment-648454
-
-namespace flags_internal {
-absl::Mutex* GetGlobalConstructionGuard();
-}  // namespace flags_internal
-
-template <typename T>
-class Flag {
- public:
-  // No constructor and destructor to ensure this is an aggregate type.
-  // Visual Studio 2015 still requires the constructor for class to be
-  // constexpr initializable.
-#if _MSC_VER <= 1900
-  constexpr Flag(const char* name, const char* filename,
-                 const flags_internal::HelpGenFunc help_gen,
-                 const flags_internal::FlagDfltGenFunc default_value_gen)
-      : name_(name),
-        filename_(filename),
-        help_gen_(help_gen),
-        default_value_gen_(default_value_gen),
-        inited_(false),
-        impl_(nullptr) {}
-#endif
-
-  flags_internal::Flag<T>& GetImpl() const {
-    if (!inited_.load(std::memory_order_acquire)) {
-      absl::MutexLock l(flags_internal::GetGlobalConstructionGuard());
-
-      if (inited_.load(std::memory_order_acquire)) {
-        return *impl_;
-      }
-
-      impl_ = new flags_internal::Flag<T>(
-          name_, filename_,
-          {flags_internal::FlagHelpMsg(help_gen_),
-           flags_internal::FlagHelpKind::kGenFunc},
-          {flags_internal::FlagDefaultSrc(default_value_gen_),
-           flags_internal::FlagDefaultKind::kGenFunc});
-      inited_.store(true, std::memory_order_release);
-    }
-
-    return *impl_;
-  }
-
-  // Public methods of `absl::Flag<T>` are NOT part of the Abseil Flags API.
-  // See https://abseil.io/docs/cpp/guides/flags
-  bool IsRetired() const { return GetImpl().IsRetired(); }
-  absl::string_view Name() const { return GetImpl().Name(); }
-  std::string Help() const { return GetImpl().Help(); }
-  bool IsModified() const { return GetImpl().IsModified(); }
-  bool IsSpecifiedOnCommandLine() const {
-    return GetImpl().IsSpecifiedOnCommandLine();
-  }
-  std::string Filename() const { return GetImpl().Filename(); }
-  std::string DefaultValue() const { return GetImpl().DefaultValue(); }
-  std::string CurrentValue() const { return GetImpl().CurrentValue(); }
-  template <typename U>
-  inline bool IsOfType() const {
-    return GetImpl().template IsOfType<U>();
-  }
-  T Get() const {
-    return flags_internal::FlagImplPeer::InvokeGet<T>(GetImpl());
-  }
-  void Set(const T& v) {
-    flags_internal::FlagImplPeer::InvokeSet(GetImpl(), v);
-  }
-  void InvokeCallback() { GetImpl().InvokeCallback(); }
-
-  const CommandLineFlag& Reflect() const {
-    return flags_internal::FlagImplPeer::InvokeReflect(GetImpl());
-  }
-
-  // The data members are logically private, but they need to be public for
-  // this to be an aggregate type.
-  const char* name_;
-  const char* filename_;
-  const flags_internal::HelpGenFunc help_gen_;
-  const flags_internal::FlagDfltGenFunc default_value_gen_;
-
-  mutable std::atomic<bool> inited_;
-  mutable flags_internal::Flag<T>* impl_;
-};
-#endif
-
-// GetFlag()
-//
-// Returns the value (of type `T`) of an `absl::Flag<T>` instance, by value. Do
-// not construct an `absl::Flag<T>` directly and call `absl::GetFlag()`;
-// instead, refer to flag's constructed variable name (e.g. `FLAGS_name`).
-// Because this function returns by value and not by reference, it is
-// thread-safe, but note that the operation may be expensive; as a result, avoid
-// `absl::GetFlag()` within any tight loops.
-//
-// Example:
-//
-//   // FLAGS_count is a Flag of type `int`
-//   int my_count = absl::GetFlag(FLAGS_count);
-//
-//   // FLAGS_firstname is a Flag of type `std::string`
-//   std::string first_name = absl::GetFlag(FLAGS_firstname);
-template <typename T>
-ABSL_MUST_USE_RESULT T GetFlag(const absl::Flag<T>& flag) {
-  return flags_internal::FlagImplPeer::InvokeGet<T>(flag);
-}
-
-// SetFlag()
-//
-// Sets the value of an `absl::Flag` to the value `v`. Do not construct an
-// `absl::Flag<T>` directly and call `absl::SetFlag()`; instead, use the
-// flag's variable name (e.g. `FLAGS_name`). This function is
-// thread-safe, but is potentially expensive. Avoid setting flags in general,
-// but especially within performance-critical code.
-template <typename T>
-void SetFlag(absl::Flag<T>* flag, const T& v) {
-  flags_internal::FlagImplPeer::InvokeSet(*flag, v);
-}
-
-// Overload of `SetFlag()` to allow callers to pass in a value that is
-// convertible to `T`. E.g., use this overload to pass a "const char*" when `T`
-// is `std::string`.
-template <typename T, typename V>
-void SetFlag(absl::Flag<T>* flag, const V& v) {
-  T value(v);
-  flags_internal::FlagImplPeer::InvokeSet(*flag, value);
-}
-
-// GetFlagReflectionHandle()
-//
-// Returns the reflection handle corresponding to specified Abseil Flag
-// instance. Use this handle to access flag's reflection information, like name,
-// location, default value etc.
-//
-// Example:
-//
-//   std::string = absl::GetFlagReflectionHandle(FLAGS_count).DefaultValue();
-
-template <typename T>
-const CommandLineFlag& GetFlagReflectionHandle(const absl::Flag<T>& f) {
-  return flags_internal::FlagImplPeer::InvokeReflect(f);
-}
-
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-
-// ABSL_FLAG()
-//
-// This macro defines an `absl::Flag<T>` instance of a specified type `T`:
-//
-//   ABSL_FLAG(T, name, default_value, help);
-//
-// where:
-//
-//   * `T` is a supported flag type (see the list of types in `marshalling.h`),
-//   * `name` designates the name of the flag (as a global variable
-//     `FLAGS_name`),
-//   * `default_value` is an expression holding the default value for this flag
-//     (which must be implicitly convertible to `T`),
-//   * `help` is the help text, which can also be an expression.
-//
-// This macro expands to a flag named 'FLAGS_name' of type 'T':
-//
-//   absl::Flag<T> FLAGS_name = ...;
-//
-// Note that all such instances are created as global variables.
-//
-// For `ABSL_FLAG()` values that you wish to expose to other translation units,
-// it is recommended to define those flags within the `.cc` file associated with
-// the header where the flag is declared.
-//
-// Note: do not construct objects of type `absl::Flag<T>` directly. Only use the
-// `ABSL_FLAG()` macro for such construction.
-#define ABSL_FLAG(Type, name, default_value, help) \
-  ABSL_FLAG_IMPL(Type, name, default_value, help)
-
-// ABSL_FLAG().OnUpdate()
-//
-// Defines a flag of type `T` with a callback attached:
-//
-//   ABSL_FLAG(T, name, default_value, help).OnUpdate(callback);
-//
-// After any setting of the flag value, the callback will be called at least
-// once. A rapid sequence of changes may be merged together into the same
-// callback. No concurrent calls to the callback will be made for the same
-// flag. Callbacks are allowed to read the current value of the flag but must
-// not mutate that flag.
-//
-// The update mechanism guarantees "eventual consistency"; if the callback
-// derives an auxiliary data structure from the flag value, it is guaranteed
-// that eventually the flag value and the derived data structure will be
-// consistent.
-//
-// Note: ABSL_FLAG.OnUpdate() does not have a public definition. Hence, this
-// comment serves as its API documentation.
-
-
-// -----------------------------------------------------------------------------
-// Implementation details below this section
-// -----------------------------------------------------------------------------
-
-// ABSL_FLAG_IMPL macro definition conditional on ABSL_FLAGS_STRIP_NAMES
-#if !defined(_MSC_VER) || defined(__clang__)
-#define ABSL_FLAG_IMPL_FLAG_PTR(flag) flag
-#define ABSL_FLAG_IMPL_HELP_ARG(name)                      \
-  absl::flags_internal::HelpArg<AbslFlagHelpGenFor##name>( \
-      FLAGS_help_storage_##name)
-#define ABSL_FLAG_IMPL_DEFAULT_ARG(Type, name) \
-  absl::flags_internal::DefaultArg<Type, AbslFlagDefaultGenFor##name>(0)
-#else
-#define ABSL_FLAG_IMPL_FLAG_PTR(flag) flag.GetImpl()
-#define ABSL_FLAG_IMPL_HELP_ARG(name) &AbslFlagHelpGenFor##name::NonConst
-#define ABSL_FLAG_IMPL_DEFAULT_ARG(Type, name) &AbslFlagDefaultGenFor##name::Gen
-#endif
-
-#if ABSL_FLAGS_STRIP_NAMES
-#define ABSL_FLAG_IMPL_FLAGNAME(txt) ""
-#define ABSL_FLAG_IMPL_FILENAME() ""
-#define ABSL_FLAG_IMPL_REGISTRAR(T, flag) \
-  absl::flags_internal::FlagRegistrar<T, false>(ABSL_FLAG_IMPL_FLAG_PTR(flag))
-#else
-#define ABSL_FLAG_IMPL_FLAGNAME(txt) txt
-#define ABSL_FLAG_IMPL_FILENAME() __FILE__
-#define ABSL_FLAG_IMPL_REGISTRAR(T, flag) \
-  absl::flags_internal::FlagRegistrar<T, true>(ABSL_FLAG_IMPL_FLAG_PTR(flag))
-#endif
-
-// ABSL_FLAG_IMPL macro definition conditional on ABSL_FLAGS_STRIP_HELP
-
-#if ABSL_FLAGS_STRIP_HELP
-#define ABSL_FLAG_IMPL_FLAGHELP(txt) absl::flags_internal::kStrippedFlagHelp
-#else
-#define ABSL_FLAG_IMPL_FLAGHELP(txt) txt
-#endif
-
-// AbslFlagHelpGenFor##name is used to encapsulate both immediate (method Const)
-// and lazy (method NonConst) evaluation of help message expression. We choose
-// between the two via the call to HelpArg in absl::Flag instantiation below.
-// If help message expression is constexpr evaluable compiler will optimize
-// away this whole struct.
-// TODO(rogeeff): place these generated structs into local namespace and apply
-// ABSL_INTERNAL_UNIQUE_SHORT_NAME.
-// TODO(rogeeff): Apply __attribute__((nodebug)) to FLAGS_help_storage_##name
-#define ABSL_FLAG_IMPL_DECLARE_HELP_WRAPPER(name, txt)                       \
-  struct AbslFlagHelpGenFor##name {                                          \
-    /* The expression is run in the caller as part of the   */               \
-    /* default value argument. That keeps temporaries alive */               \
-    /* long enough for NonConst to work correctly.          */               \
-    static constexpr absl::string_view Value(                                \
-        absl::string_view v = ABSL_FLAG_IMPL_FLAGHELP(txt)) {                \
-      return v;                                                              \
-    }                                                                        \
-    static std::string NonConst() { return std::string(Value()); }           \
-  };                                                                         \
-  constexpr auto FLAGS_help_storage_##name ABSL_INTERNAL_UNIQUE_SMALL_NAME() \
-      ABSL_ATTRIBUTE_SECTION_VARIABLE(flags_help_cold) =                     \
-          absl::flags_internal::HelpStringAsArray<AbslFlagHelpGenFor##name>( \
-              0);
-
-#define ABSL_FLAG_IMPL_DECLARE_DEF_VAL_WRAPPER(name, Type, default_value)     \
-  struct AbslFlagDefaultGenFor##name {                                        \
-    Type value = absl::flags_internal::InitDefaultValue<Type>(default_value); \
-    static void Gen(void* p) {                                                \
-      new (p) Type(AbslFlagDefaultGenFor##name{}.value);                      \
-    }                                                                         \
-  };
-
-// ABSL_FLAG_IMPL
-//
-// Note: Name of registrar object is not arbitrary. It is used to "grab"
-// global name for FLAGS_no<flag_name> symbol, thus preventing the possibility
-// of defining two flags with names foo and nofoo.
-#define ABSL_FLAG_IMPL(Type, name, default_value, help)                       \
-  namespace absl /* block flags in namespaces */ {}                           \
-  ABSL_FLAG_IMPL_DECLARE_DEF_VAL_WRAPPER(name, Type, default_value)           \
-  ABSL_FLAG_IMPL_DECLARE_HELP_WRAPPER(name, help)                             \
-  ABSL_CONST_INIT absl::Flag<Type> FLAGS_##name{                              \
-      ABSL_FLAG_IMPL_FLAGNAME(#name), ABSL_FLAG_IMPL_FILENAME(),              \
-      ABSL_FLAG_IMPL_HELP_ARG(name), ABSL_FLAG_IMPL_DEFAULT_ARG(Type, name)}; \
-  extern absl::flags_internal::FlagRegistrarEmpty FLAGS_no##name;             \
-  absl::flags_internal::FlagRegistrarEmpty FLAGS_no##name =                   \
-      ABSL_FLAG_IMPL_REGISTRAR(Type, FLAGS_##name)
-
-// ABSL_RETIRED_FLAG
-//
-// Designates the flag (which is usually pre-existing) as "retired." A retired
-// flag is a flag that is now unused by the program, but may still be passed on
-// the command line, usually by production scripts. A retired flag is ignored
-// and code can't access it at runtime.
-//
-// This macro registers a retired flag with given name and type, with a name
-// identical to the name of the original flag you are retiring. The retired
-// flag's type can change over time, so that you can retire code to support a
-// custom flag type.
-//
-// This macro has the same signature as `ABSL_FLAG`. To retire a flag, simply
-// replace an `ABSL_FLAG` definition with `ABSL_RETIRED_FLAG`, leaving the
-// arguments unchanged (unless of course you actually want to retire the flag
-// type at this time as well).
-//
-// `default_value` is only used as a double check on the type. `explanation` is
-// unused.
-// TODO(rogeeff): replace RETIRED_FLAGS with FLAGS once forward declarations of
-// retired flags are cleaned up.
-#define ABSL_RETIRED_FLAG(type, name, default_value, explanation)      \
-  static absl::flags_internal::RetiredFlag<type> RETIRED_FLAGS_##name; \
-  ABSL_ATTRIBUTE_UNUSED static const auto RETIRED_FLAGS_REG_##name =   \
-      (RETIRED_FLAGS_##name.Retire(#name),                             \
-       ::absl::flags_internal::FlagRegistrarEmpty{})
-
-#endif  // ABSL_FLAGS_FLAG_H_
diff --git a/third_party/abseil_cpp/absl/flags/flag_benchmark.cc b/third_party/abseil_cpp/absl/flags/flag_benchmark.cc
deleted file mode 100644
index 9982b604b3b5..000000000000
--- a/third_party/abseil_cpp/absl/flags/flag_benchmark.cc
+++ /dev/null
@@ -1,159 +0,0 @@
-//
-// Copyright 2020 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include <stdint.h>
-
-#include <string>
-#include <vector>
-
-#include "absl/flags/flag.h"
-#include "absl/flags/marshalling.h"
-#include "absl/flags/parse.h"
-#include "absl/flags/reflection.h"
-#include "absl/strings/string_view.h"
-#include "absl/time/time.h"
-#include "absl/types/optional.h"
-#include "benchmark/benchmark.h"
-
-namespace {
-using String = std::string;
-using VectorOfStrings = std::vector<std::string>;
-using AbslDuration = absl::Duration;
-
-// We do not want to take over marshalling for the types absl::optional<int>,
-// absl::optional<std::string> which we do not own. Instead we introduce unique
-// "aliases" to these types, which we do.
-using AbslOptionalInt = absl::optional<int>;
-struct OptionalInt : AbslOptionalInt {
-  using AbslOptionalInt::AbslOptionalInt;
-};
-// Next two functions represent Abseil Flags marshalling for OptionalInt.
-bool AbslParseFlag(absl::string_view src, OptionalInt* flag,
-                   std::string* error) {
-  int val;
-  if (src.empty())
-    flag->reset();
-  else if (!absl::ParseFlag(src, &val, error))
-    return false;
-  *flag = val;
-  return true;
-}
-std::string AbslUnparseFlag(const OptionalInt& flag) {
-  return !flag ? "" : absl::UnparseFlag(*flag);
-}
-
-using AbslOptionalString = absl::optional<std::string>;
-struct OptionalString : AbslOptionalString {
-  using AbslOptionalString::AbslOptionalString;
-};
-// Next two functions represent Abseil Flags marshalling for OptionalString.
-bool AbslParseFlag(absl::string_view src, OptionalString* flag,
-                   std::string* error) {
-  std::string val;
-  if (src.empty())
-    flag->reset();
-  else if (!absl::ParseFlag(src, &val, error))
-    return false;
-  *flag = val;
-  return true;
-}
-std::string AbslUnparseFlag(const OptionalString& flag) {
-  return !flag ? "" : absl::UnparseFlag(*flag);
-}
-
-struct UDT {
-  UDT() = default;
-  UDT(const UDT&) {}
-  UDT& operator=(const UDT&) { return *this; }
-};
-// Next two functions represent Abseil Flags marshalling for UDT.
-bool AbslParseFlag(absl::string_view, UDT*, std::string*) { return true; }
-std::string AbslUnparseFlag(const UDT&) { return ""; }
-
-}  // namespace
-
-#define BENCHMARKED_TYPES(A) \
-  A(bool)                    \
-  A(int16_t)                 \
-  A(uint16_t)                \
-  A(int32_t)                 \
-  A(uint32_t)                \
-  A(int64_t)                 \
-  A(uint64_t)                \
-  A(double)                  \
-  A(float)                   \
-  A(String)                  \
-  A(VectorOfStrings)         \
-  A(OptionalInt)             \
-  A(OptionalString)          \
-  A(AbslDuration)            \
-  A(UDT)
-
-#define FLAG_DEF(T) ABSL_FLAG(T, T##_flag, {}, "");
-
-BENCHMARKED_TYPES(FLAG_DEF)
-
-// Register thousands of flags to bloat up the size of the registry.
-// This mimics real life production binaries.
-#define DEFINE_FLAG_0(name) ABSL_FLAG(int, name, 0, "");
-#define DEFINE_FLAG_1(name) DEFINE_FLAG_0(name##0) DEFINE_FLAG_0(name##1)
-#define DEFINE_FLAG_2(name) DEFINE_FLAG_1(name##0) DEFINE_FLAG_1(name##1)
-#define DEFINE_FLAG_3(name) DEFINE_FLAG_2(name##0) DEFINE_FLAG_2(name##1)
-#define DEFINE_FLAG_4(name) DEFINE_FLAG_3(name##0) DEFINE_FLAG_3(name##1)
-#define DEFINE_FLAG_5(name) DEFINE_FLAG_4(name##0) DEFINE_FLAG_4(name##1)
-#define DEFINE_FLAG_6(name) DEFINE_FLAG_5(name##0) DEFINE_FLAG_5(name##1)
-#define DEFINE_FLAG_7(name) DEFINE_FLAG_6(name##0) DEFINE_FLAG_6(name##1)
-#define DEFINE_FLAG_8(name) DEFINE_FLAG_7(name##0) DEFINE_FLAG_7(name##1)
-#define DEFINE_FLAG_9(name) DEFINE_FLAG_8(name##0) DEFINE_FLAG_8(name##1)
-#define DEFINE_FLAG_10(name) DEFINE_FLAG_9(name##0) DEFINE_FLAG_9(name##1)
-#define DEFINE_FLAG_11(name) DEFINE_FLAG_10(name##0) DEFINE_FLAG_10(name##1)
-#define DEFINE_FLAG_12(name) DEFINE_FLAG_11(name##0) DEFINE_FLAG_11(name##1)
-DEFINE_FLAG_12(bloat_flag_);
-
-namespace {
-
-#define BM_GetFlag(T)                                            \
-  void BM_GetFlag_##T(benchmark::State& state) {                 \
-    for (auto _ : state) {                                       \
-      benchmark::DoNotOptimize(absl::GetFlag(FLAGS_##T##_flag)); \
-    }                                                            \
-  }                                                              \
-  BENCHMARK(BM_GetFlag_##T);
-
-BENCHMARKED_TYPES(BM_GetFlag)
-
-void BM_ThreadedFindCommandLineFlag(benchmark::State& state) {
-  char dummy[] = "dummy";
-  char* argv[] = {dummy};
-  // We need to ensure that flags have been parsed. That is where the registry
-  // is finalized.
-  absl::ParseCommandLine(1, argv);
-
-  for (auto s : state) {
-    benchmark::DoNotOptimize(
-        absl::FindCommandLineFlag("bloat_flag_010101010101"));
-  }
-}
-BENCHMARK(BM_ThreadedFindCommandLineFlag)->ThreadRange(1, 16);
-
-}  // namespace
-
-#define InvokeGetFlag(T)                                               \
-  T AbslInvokeGetFlag##T() { return absl::GetFlag(FLAGS_##T##_flag); } \
-  int odr##T = (benchmark::DoNotOptimize(AbslInvokeGetFlag##T), 1);
-
-BENCHMARKED_TYPES(InvokeGetFlag)
-
-// To veiw disassembly use: gdb ${BINARY}  -batch -ex "disassemble /s $FUNC"
diff --git a/third_party/abseil_cpp/absl/flags/flag_test.cc b/third_party/abseil_cpp/absl/flags/flag_test.cc
deleted file mode 100644
index 654c8122215c..000000000000
--- a/third_party/abseil_cpp/absl/flags/flag_test.cc
+++ /dev/null
@@ -1,906 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/flag.h"
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include <cmath>
-#include <new>
-#include <string>
-#include <thread>  // NOLINT
-#include <vector>
-
-#include "gtest/gtest.h"
-#include "absl/base/attributes.h"
-#include "absl/flags/config.h"
-#include "absl/flags/declare.h"
-#include "absl/flags/internal/flag.h"
-#include "absl/flags/marshalling.h"
-#include "absl/flags/reflection.h"
-#include "absl/flags/usage_config.h"
-#include "absl/strings/match.h"
-#include "absl/strings/numbers.h"
-#include "absl/strings/str_cat.h"
-#include "absl/strings/str_split.h"
-#include "absl/strings/string_view.h"
-#include "absl/time/time.h"
-
-ABSL_DECLARE_FLAG(int64_t, mistyped_int_flag);
-ABSL_DECLARE_FLAG(std::vector<std::string>, mistyped_string_flag);
-
-namespace {
-
-namespace flags = absl::flags_internal;
-
-std::string TestHelpMsg() { return "dynamic help"; }
-#if defined(_MSC_VER) && !defined(__clang__)
-std::string TestLiteralHelpMsg() { return "literal help"; }
-#endif
-template <typename T>
-void TestMakeDflt(void* dst) {
-  new (dst) T{};
-}
-void TestCallback() {}
-
-struct UDT {
-  UDT() = default;
-  UDT(const UDT&) = default;
-};
-bool AbslParseFlag(absl::string_view, UDT*, std::string*) { return true; }
-std::string AbslUnparseFlag(const UDT&) { return ""; }
-
-class FlagTest : public testing::Test {
- protected:
-  static void SetUpTestSuite() {
-    // Install a function to normalize filenames before this test is run.
-    absl::FlagsUsageConfig default_config;
-    default_config.normalize_filename = &FlagTest::NormalizeFileName;
-    absl::SetFlagsUsageConfig(default_config);
-  }
-
- private:
-  static std::string NormalizeFileName(absl::string_view fname) {
-#ifdef _WIN32
-    std::string normalized(fname);
-    std::replace(normalized.begin(), normalized.end(), '\\', '/');
-    fname = normalized;
-#endif
-    return std::string(fname);
-  }
-  absl::FlagSaver flag_saver_;
-};
-
-struct S1 {
-  S1() = default;
-  S1(const S1&) = default;
-  int32_t f1;
-  int64_t f2;
-};
-
-struct S2 {
-  S2() = default;
-  S2(const S2&) = default;
-  int64_t f1;
-  double f2;
-};
-
-TEST_F(FlagTest, Traits) {
-  EXPECT_EQ(flags::StorageKind<int>(),
-            flags::FlagValueStorageKind::kOneWordAtomic);
-  EXPECT_EQ(flags::StorageKind<bool>(),
-            flags::FlagValueStorageKind::kOneWordAtomic);
-  EXPECT_EQ(flags::StorageKind<double>(),
-            flags::FlagValueStorageKind::kOneWordAtomic);
-  EXPECT_EQ(flags::StorageKind<int64_t>(),
-            flags::FlagValueStorageKind::kOneWordAtomic);
-
-#if defined(ABSL_FLAGS_INTERNAL_ATOMIC_DOUBLE_WORD)
-  EXPECT_EQ(flags::StorageKind<S1>(),
-            flags::FlagValueStorageKind::kTwoWordsAtomic);
-  EXPECT_EQ(flags::StorageKind<S2>(),
-            flags::FlagValueStorageKind::kTwoWordsAtomic);
-#else
-  EXPECT_EQ(flags::StorageKind<S1>(),
-            flags::FlagValueStorageKind::kAlignedBuffer);
-  EXPECT_EQ(flags::StorageKind<S2>(),
-            flags::FlagValueStorageKind::kAlignedBuffer);
-#endif
-
-  EXPECT_EQ(flags::StorageKind<std::string>(),
-            flags::FlagValueStorageKind::kAlignedBuffer);
-  EXPECT_EQ(flags::StorageKind<std::vector<std::string>>(),
-            flags::FlagValueStorageKind::kAlignedBuffer);
-}
-
-// --------------------------------------------------------------------
-
-constexpr flags::FlagHelpArg help_arg{flags::FlagHelpMsg("literal help"),
-                                      flags::FlagHelpKind::kLiteral};
-
-using String = std::string;
-
-#if !defined(_MSC_VER) || defined(__clang__)
-#define DEFINE_CONSTRUCTED_FLAG(T, dflt, dflt_kind)                        \
-  constexpr flags::FlagDefaultArg f1default##T{                            \
-      flags::FlagDefaultSrc{dflt}, flags::FlagDefaultKind::dflt_kind};     \
-  constexpr absl::Flag<T> f1##T{"f1", "file", help_arg, f1default##T};     \
-  ABSL_CONST_INIT absl::Flag<T> f2##T {                                    \
-    "f2", "file",                                                          \
-        {flags::FlagHelpMsg(&TestHelpMsg), flags::FlagHelpKind::kGenFunc}, \
-        flags::FlagDefaultArg {                                            \
-      flags::FlagDefaultSrc(&TestMakeDflt<T>),                             \
-          flags::FlagDefaultKind::kGenFunc                                 \
-    }                                                                      \
-  }
-#else
-#define DEFINE_CONSTRUCTED_FLAG(T, dflt, dflt_kind)                    \
-  constexpr flags::FlagDefaultArg f1default##T{                        \
-      flags::FlagDefaultSrc{dflt}, flags::FlagDefaultKind::dflt_kind}; \
-  constexpr absl::Flag<T> f1##T{"f1", "file", &TestLiteralHelpMsg,     \
-                                &TestMakeDflt<T>};                     \
-  ABSL_CONST_INIT absl::Flag<T> f2##T {                                \
-    "f2", "file", &TestHelpMsg, &TestMakeDflt<T>                       \
-  }
-#endif
-
-DEFINE_CONSTRUCTED_FLAG(bool, true, kOneWord);
-DEFINE_CONSTRUCTED_FLAG(int16_t, 1, kOneWord);
-DEFINE_CONSTRUCTED_FLAG(uint16_t, 2, kOneWord);
-DEFINE_CONSTRUCTED_FLAG(int32_t, 3, kOneWord);
-DEFINE_CONSTRUCTED_FLAG(uint32_t, 4, kOneWord);
-DEFINE_CONSTRUCTED_FLAG(int64_t, 5, kOneWord);
-DEFINE_CONSTRUCTED_FLAG(uint64_t, 6, kOneWord);
-DEFINE_CONSTRUCTED_FLAG(float, 7.8, kOneWord);
-DEFINE_CONSTRUCTED_FLAG(double, 9.10, kOneWord);
-DEFINE_CONSTRUCTED_FLAG(String, &TestMakeDflt<String>, kGenFunc);
-DEFINE_CONSTRUCTED_FLAG(UDT, &TestMakeDflt<UDT>, kGenFunc);
-
-template <typename T>
-bool TestConstructionFor(const absl::Flag<T>& f1, absl::Flag<T>& f2) {
-  EXPECT_EQ(absl::GetFlagReflectionHandle(f1).Name(), "f1");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(f1).Help(), "literal help");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(f1).Filename(), "file");
-
-  flags::FlagRegistrar<T, false>(ABSL_FLAG_IMPL_FLAG_PTR(f2))
-      .OnUpdate(TestCallback);
-
-  EXPECT_EQ(absl::GetFlagReflectionHandle(f2).Name(), "f2");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(f2).Help(), "dynamic help");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(f2).Filename(), "file");
-
-  return true;
-}
-
-#define TEST_CONSTRUCTED_FLAG(T) TestConstructionFor(f1##T, f2##T);
-
-TEST_F(FlagTest, TestConstruction) {
-  TEST_CONSTRUCTED_FLAG(bool);
-  TEST_CONSTRUCTED_FLAG(int16_t);
-  TEST_CONSTRUCTED_FLAG(uint16_t);
-  TEST_CONSTRUCTED_FLAG(int32_t);
-  TEST_CONSTRUCTED_FLAG(uint32_t);
-  TEST_CONSTRUCTED_FLAG(int64_t);
-  TEST_CONSTRUCTED_FLAG(uint64_t);
-  TEST_CONSTRUCTED_FLAG(float);
-  TEST_CONSTRUCTED_FLAG(double);
-  TEST_CONSTRUCTED_FLAG(String);
-  TEST_CONSTRUCTED_FLAG(UDT);
-}
-
-// --------------------------------------------------------------------
-
-}  // namespace
-
-ABSL_DECLARE_FLAG(bool, test_flag_01);
-ABSL_DECLARE_FLAG(int, test_flag_02);
-ABSL_DECLARE_FLAG(int16_t, test_flag_03);
-ABSL_DECLARE_FLAG(uint16_t, test_flag_04);
-ABSL_DECLARE_FLAG(int32_t, test_flag_05);
-ABSL_DECLARE_FLAG(uint32_t, test_flag_06);
-ABSL_DECLARE_FLAG(int64_t, test_flag_07);
-ABSL_DECLARE_FLAG(uint64_t, test_flag_08);
-ABSL_DECLARE_FLAG(double, test_flag_09);
-ABSL_DECLARE_FLAG(float, test_flag_10);
-ABSL_DECLARE_FLAG(std::string, test_flag_11);
-ABSL_DECLARE_FLAG(absl::Duration, test_flag_12);
-
-namespace {
-
-#if !ABSL_FLAGS_STRIP_NAMES
-
-TEST_F(FlagTest, TestFlagDeclaration) {
-  // test that we can access flag objects.
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_01).Name(),
-            "test_flag_01");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_02).Name(),
-            "test_flag_02");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_03).Name(),
-            "test_flag_03");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_04).Name(),
-            "test_flag_04");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_05).Name(),
-            "test_flag_05");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_06).Name(),
-            "test_flag_06");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_07).Name(),
-            "test_flag_07");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_08).Name(),
-            "test_flag_08");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_09).Name(),
-            "test_flag_09");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_10).Name(),
-            "test_flag_10");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_11).Name(),
-            "test_flag_11");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_12).Name(),
-            "test_flag_12");
-}
-#endif  // !ABSL_FLAGS_STRIP_NAMES
-
-// --------------------------------------------------------------------
-
-}  // namespace
-
-ABSL_FLAG(bool, test_flag_01, true, "test flag 01");
-ABSL_FLAG(int, test_flag_02, 1234, "test flag 02");
-ABSL_FLAG(int16_t, test_flag_03, -34, "test flag 03");
-ABSL_FLAG(uint16_t, test_flag_04, 189, "test flag 04");
-ABSL_FLAG(int32_t, test_flag_05, 10765, "test flag 05");
-ABSL_FLAG(uint32_t, test_flag_06, 40000, "test flag 06");
-ABSL_FLAG(int64_t, test_flag_07, -1234567, "test flag 07");
-ABSL_FLAG(uint64_t, test_flag_08, 9876543, "test flag 08");
-ABSL_FLAG(double, test_flag_09, -9.876e-50, "test flag 09");
-ABSL_FLAG(float, test_flag_10, 1.234e12f, "test flag 10");
-ABSL_FLAG(std::string, test_flag_11, "", "test flag 11");
-ABSL_FLAG(absl::Duration, test_flag_12, absl::Minutes(10), "test flag 12");
-
-namespace {
-
-#if !ABSL_FLAGS_STRIP_NAMES
-TEST_F(FlagTest, TestFlagDefinition) {
-  absl::string_view expected_file_name = "absl/flags/flag_test.cc";
-
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_01).Name(),
-            "test_flag_01");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_01).Help(),
-            "test flag 01");
-  EXPECT_TRUE(absl::EndsWith(
-      absl::GetFlagReflectionHandle(FLAGS_test_flag_01).Filename(),
-      expected_file_name))
-      << absl::GetFlagReflectionHandle(FLAGS_test_flag_01).Filename();
-
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_02).Name(),
-            "test_flag_02");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_02).Help(),
-            "test flag 02");
-  EXPECT_TRUE(absl::EndsWith(
-      absl::GetFlagReflectionHandle(FLAGS_test_flag_02).Filename(),
-      expected_file_name))
-      << absl::GetFlagReflectionHandle(FLAGS_test_flag_02).Filename();
-
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_03).Name(),
-            "test_flag_03");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_03).Help(),
-            "test flag 03");
-  EXPECT_TRUE(absl::EndsWith(
-      absl::GetFlagReflectionHandle(FLAGS_test_flag_03).Filename(),
-      expected_file_name))
-      << absl::GetFlagReflectionHandle(FLAGS_test_flag_03).Filename();
-
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_04).Name(),
-            "test_flag_04");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_04).Help(),
-            "test flag 04");
-  EXPECT_TRUE(absl::EndsWith(
-      absl::GetFlagReflectionHandle(FLAGS_test_flag_04).Filename(),
-      expected_file_name))
-      << absl::GetFlagReflectionHandle(FLAGS_test_flag_04).Filename();
-
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_05).Name(),
-            "test_flag_05");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_05).Help(),
-            "test flag 05");
-  EXPECT_TRUE(absl::EndsWith(
-      absl::GetFlagReflectionHandle(FLAGS_test_flag_05).Filename(),
-      expected_file_name))
-      << absl::GetFlagReflectionHandle(FLAGS_test_flag_05).Filename();
-
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_06).Name(),
-            "test_flag_06");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_06).Help(),
-            "test flag 06");
-  EXPECT_TRUE(absl::EndsWith(
-      absl::GetFlagReflectionHandle(FLAGS_test_flag_06).Filename(),
-      expected_file_name))
-      << absl::GetFlagReflectionHandle(FLAGS_test_flag_06).Filename();
-
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_07).Name(),
-            "test_flag_07");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_07).Help(),
-            "test flag 07");
-  EXPECT_TRUE(absl::EndsWith(
-      absl::GetFlagReflectionHandle(FLAGS_test_flag_07).Filename(),
-      expected_file_name))
-      << absl::GetFlagReflectionHandle(FLAGS_test_flag_07).Filename();
-
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_08).Name(),
-            "test_flag_08");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_08).Help(),
-            "test flag 08");
-  EXPECT_TRUE(absl::EndsWith(
-      absl::GetFlagReflectionHandle(FLAGS_test_flag_08).Filename(),
-      expected_file_name))
-      << absl::GetFlagReflectionHandle(FLAGS_test_flag_08).Filename();
-
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_09).Name(),
-            "test_flag_09");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_09).Help(),
-            "test flag 09");
-  EXPECT_TRUE(absl::EndsWith(
-      absl::GetFlagReflectionHandle(FLAGS_test_flag_09).Filename(),
-      expected_file_name))
-      << absl::GetFlagReflectionHandle(FLAGS_test_flag_09).Filename();
-
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_10).Name(),
-            "test_flag_10");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_10).Help(),
-            "test flag 10");
-  EXPECT_TRUE(absl::EndsWith(
-      absl::GetFlagReflectionHandle(FLAGS_test_flag_10).Filename(),
-      expected_file_name))
-      << absl::GetFlagReflectionHandle(FLAGS_test_flag_10).Filename();
-
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_11).Name(),
-            "test_flag_11");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_11).Help(),
-            "test flag 11");
-  EXPECT_TRUE(absl::EndsWith(
-      absl::GetFlagReflectionHandle(FLAGS_test_flag_11).Filename(),
-      expected_file_name))
-      << absl::GetFlagReflectionHandle(FLAGS_test_flag_11).Filename();
-
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_12).Name(),
-            "test_flag_12");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_12).Help(),
-            "test flag 12");
-  EXPECT_TRUE(absl::EndsWith(
-      absl::GetFlagReflectionHandle(FLAGS_test_flag_12).Filename(),
-      expected_file_name))
-      << absl::GetFlagReflectionHandle(FLAGS_test_flag_12).Filename();
-}
-#endif  // !ABSL_FLAGS_STRIP_NAMES
-
-// --------------------------------------------------------------------
-
-TEST_F(FlagTest, TestDefault) {
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_01).DefaultValue(),
-            "true");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_02).DefaultValue(),
-            "1234");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_03).DefaultValue(),
-            "-34");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_04).DefaultValue(),
-            "189");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_05).DefaultValue(),
-            "10765");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_06).DefaultValue(),
-            "40000");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_07).DefaultValue(),
-            "-1234567");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_08).DefaultValue(),
-            "9876543");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_09).DefaultValue(),
-            "-9.876e-50");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_10).DefaultValue(),
-            "1.234e+12");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_11).DefaultValue(),
-            "");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_12).DefaultValue(),
-            "10m");
-
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_01).CurrentValue(),
-            "true");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_02).CurrentValue(),
-            "1234");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_03).CurrentValue(),
-            "-34");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_04).CurrentValue(),
-            "189");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_05).CurrentValue(),
-            "10765");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_06).CurrentValue(),
-            "40000");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_07).CurrentValue(),
-            "-1234567");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_08).CurrentValue(),
-            "9876543");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_09).CurrentValue(),
-            "-9.876e-50");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_10).CurrentValue(),
-            "1.234e+12");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_11).CurrentValue(),
-            "");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_12).CurrentValue(),
-            "10m");
-
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_01), true);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_02), 1234);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_03), -34);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_04), 189);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_05), 10765);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_06), 40000);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_07), -1234567);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 9876543);
-  EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_09), -9.876e-50, 1e-55);
-  EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_10), 1.234e12f, 1e5f);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_11), "");
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_12), absl::Minutes(10));
-}
-
-// --------------------------------------------------------------------
-
-struct NonTriviallyCopyableAggregate {
-  NonTriviallyCopyableAggregate() = default;
-  NonTriviallyCopyableAggregate(const NonTriviallyCopyableAggregate& rhs)
-      : value(rhs.value) {}
-  NonTriviallyCopyableAggregate& operator=(
-      const NonTriviallyCopyableAggregate& rhs) {
-    value = rhs.value;
-    return *this;
-  }
-
-  int value;
-};
-bool AbslParseFlag(absl::string_view src, NonTriviallyCopyableAggregate* f,
-                   std::string* e) {
-  return absl::ParseFlag(src, &f->value, e);
-}
-std::string AbslUnparseFlag(const NonTriviallyCopyableAggregate& ntc) {
-  return absl::StrCat(ntc.value);
-}
-
-bool operator==(const NonTriviallyCopyableAggregate& ntc1,
-                const NonTriviallyCopyableAggregate& ntc2) {
-  return ntc1.value == ntc2.value;
-}
-
-}  // namespace
-
-ABSL_FLAG(bool, test_flag_eb_01, {}, "");
-ABSL_FLAG(int32_t, test_flag_eb_02, {}, "");
-ABSL_FLAG(int64_t, test_flag_eb_03, {}, "");
-ABSL_FLAG(double, test_flag_eb_04, {}, "");
-ABSL_FLAG(std::string, test_flag_eb_05, {}, "");
-ABSL_FLAG(NonTriviallyCopyableAggregate, test_flag_eb_06, {}, "");
-
-namespace {
-
-TEST_F(FlagTest, TestEmptyBracesDefault) {
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_eb_01).DefaultValue(),
-            "false");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_eb_02).DefaultValue(),
-            "0");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_eb_03).DefaultValue(),
-            "0");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_eb_04).DefaultValue(),
-            "0");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_eb_05).DefaultValue(),
-            "");
-  EXPECT_EQ(absl::GetFlagReflectionHandle(FLAGS_test_flag_eb_06).DefaultValue(),
-            "0");
-
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_eb_01), false);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_eb_02), 0);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_eb_03), 0);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_eb_04), 0.0);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_eb_05), "");
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_eb_06),
-            NonTriviallyCopyableAggregate{});
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(FlagTest, TestGetSet) {
-  absl::SetFlag(&FLAGS_test_flag_01, false);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_01), false);
-
-  absl::SetFlag(&FLAGS_test_flag_02, 321);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_02), 321);
-
-  absl::SetFlag(&FLAGS_test_flag_03, 67);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_03), 67);
-
-  absl::SetFlag(&FLAGS_test_flag_04, 1);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_04), 1);
-
-  absl::SetFlag(&FLAGS_test_flag_05, -908);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_05), -908);
-
-  absl::SetFlag(&FLAGS_test_flag_06, 4001);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_06), 4001);
-
-  absl::SetFlag(&FLAGS_test_flag_07, -23456);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_07), -23456);
-
-  absl::SetFlag(&FLAGS_test_flag_08, 975310);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 975310);
-
-  absl::SetFlag(&FLAGS_test_flag_09, 1.00001);
-  EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_09), 1.00001, 1e-10);
-
-  absl::SetFlag(&FLAGS_test_flag_10, -3.54f);
-  EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_10), -3.54f, 1e-6f);
-
-  absl::SetFlag(&FLAGS_test_flag_11, "asdf");
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_11), "asdf");
-
-  absl::SetFlag(&FLAGS_test_flag_12, absl::Seconds(110));
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_12), absl::Seconds(110));
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(FlagTest, TestGetViaReflection) {
-  auto* handle = absl::FindCommandLineFlag("test_flag_01");
-  EXPECT_EQ(*handle->TryGet<bool>(), true);
-  handle = absl::FindCommandLineFlag("test_flag_02");
-  EXPECT_EQ(*handle->TryGet<int>(), 1234);
-  handle = absl::FindCommandLineFlag("test_flag_03");
-  EXPECT_EQ(*handle->TryGet<int16_t>(), -34);
-  handle = absl::FindCommandLineFlag("test_flag_04");
-  EXPECT_EQ(*handle->TryGet<uint16_t>(), 189);
-  handle = absl::FindCommandLineFlag("test_flag_05");
-  EXPECT_EQ(*handle->TryGet<int32_t>(), 10765);
-  handle = absl::FindCommandLineFlag("test_flag_06");
-  EXPECT_EQ(*handle->TryGet<uint32_t>(), 40000);
-  handle = absl::FindCommandLineFlag("test_flag_07");
-  EXPECT_EQ(*handle->TryGet<int64_t>(), -1234567);
-  handle = absl::FindCommandLineFlag("test_flag_08");
-  EXPECT_EQ(*handle->TryGet<uint64_t>(), 9876543);
-  handle = absl::FindCommandLineFlag("test_flag_09");
-  EXPECT_NEAR(*handle->TryGet<double>(), -9.876e-50, 1e-55);
-  handle = absl::FindCommandLineFlag("test_flag_10");
-  EXPECT_NEAR(*handle->TryGet<float>(), 1.234e12f, 1e5f);
-  handle = absl::FindCommandLineFlag("test_flag_11");
-  EXPECT_EQ(*handle->TryGet<std::string>(), "");
-  handle = absl::FindCommandLineFlag("test_flag_12");
-  EXPECT_EQ(*handle->TryGet<absl::Duration>(), absl::Minutes(10));
-}
-
-// --------------------------------------------------------------------
-
-int GetDflt1() { return 1; }
-
-}  // namespace
-
-ABSL_FLAG(int, test_int_flag_with_non_const_default, GetDflt1(),
-          "test int flag non const default");
-ABSL_FLAG(std::string, test_string_flag_with_non_const_default,
-          absl::StrCat("AAA", "BBB"), "test string flag non const default");
-
-namespace {
-
-TEST_F(FlagTest, TestNonConstexprDefault) {
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_int_flag_with_non_const_default), 1);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_string_flag_with_non_const_default),
-            "AAABBB");
-}
-
-// --------------------------------------------------------------------
-
-}  // namespace
-
-ABSL_FLAG(bool, test_flag_with_non_const_help, true,
-          absl::StrCat("test ", "flag ", "non const help"));
-
-namespace {
-
-#if !ABSL_FLAGS_STRIP_HELP
-TEST_F(FlagTest, TestNonConstexprHelp) {
-  EXPECT_EQ(
-      absl::GetFlagReflectionHandle(FLAGS_test_flag_with_non_const_help).Help(),
-      "test flag non const help");
-}
-#endif  //! ABSL_FLAGS_STRIP_HELP
-
-// --------------------------------------------------------------------
-
-int cb_test_value = -1;
-void TestFlagCB();
-
-}  // namespace
-
-ABSL_FLAG(int, test_flag_with_cb, 100, "").OnUpdate(TestFlagCB);
-
-ABSL_FLAG(int, test_flag_with_lambda_cb, 200, "").OnUpdate([]() {
-  cb_test_value = absl::GetFlag(FLAGS_test_flag_with_lambda_cb) +
-                  absl::GetFlag(FLAGS_test_flag_with_cb);
-});
-
-namespace {
-
-void TestFlagCB() { cb_test_value = absl::GetFlag(FLAGS_test_flag_with_cb); }
-
-// Tests side-effects of callback invocation.
-TEST_F(FlagTest, CallbackInvocation) {
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_with_cb), 100);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_with_lambda_cb), 200);
-  EXPECT_EQ(cb_test_value, 300);
-
-  absl::SetFlag(&FLAGS_test_flag_with_cb, 1);
-  EXPECT_EQ(cb_test_value, 1);
-
-  absl::SetFlag(&FLAGS_test_flag_with_lambda_cb, 3);
-  EXPECT_EQ(cb_test_value, 4);
-}
-
-// --------------------------------------------------------------------
-
-struct CustomUDT {
-  CustomUDT() : a(1), b(1) {}
-  CustomUDT(int a_, int b_) : a(a_), b(b_) {}
-
-  friend bool operator==(const CustomUDT& f1, const CustomUDT& f2) {
-    return f1.a == f2.a && f1.b == f2.b;
-  }
-
-  int a;
-  int b;
-};
-bool AbslParseFlag(absl::string_view in, CustomUDT* f, std::string*) {
-  std::vector<absl::string_view> parts =
-      absl::StrSplit(in, ':', absl::SkipWhitespace());
-
-  if (parts.size() != 2) return false;
-
-  if (!absl::SimpleAtoi(parts[0], &f->a)) return false;
-
-  if (!absl::SimpleAtoi(parts[1], &f->b)) return false;
-
-  return true;
-}
-std::string AbslUnparseFlag(const CustomUDT& f) {
-  return absl::StrCat(f.a, ":", f.b);
-}
-
-}  // namespace
-
-ABSL_FLAG(CustomUDT, test_flag_custom_udt, CustomUDT(), "test flag custom UDT");
-
-namespace {
-
-TEST_F(FlagTest, TestCustomUDT) {
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_custom_udt), CustomUDT(1, 1));
-  absl::SetFlag(&FLAGS_test_flag_custom_udt, CustomUDT(2, 3));
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_custom_udt), CustomUDT(2, 3));
-}
-
-// MSVC produces link error on the type mismatch.
-// Linux does not have build errors and validations work as expected.
-#if !defined(_WIN32) && GTEST_HAS_DEATH_TEST
-
-using FlagDeathTest = FlagTest;
-
-TEST_F(FlagDeathTest, TestTypeMismatchValidations) {
-#if !defined(NDEBUG)
-  EXPECT_DEATH_IF_SUPPORTED(
-      static_cast<void>(absl::GetFlag(FLAGS_mistyped_int_flag)),
-      "Flag 'mistyped_int_flag' is defined as one type and declared "
-      "as another");
-  EXPECT_DEATH_IF_SUPPORTED(
-      static_cast<void>(absl::GetFlag(FLAGS_mistyped_string_flag)),
-      "Flag 'mistyped_string_flag' is defined as one type and "
-      "declared as another");
-#endif
-
-  EXPECT_DEATH_IF_SUPPORTED(
-      absl::SetFlag(&FLAGS_mistyped_int_flag, 1),
-      "Flag 'mistyped_int_flag' is defined as one type and declared "
-      "as another");
-  EXPECT_DEATH_IF_SUPPORTED(
-      absl::SetFlag(&FLAGS_mistyped_string_flag, std::vector<std::string>{}),
-      "Flag 'mistyped_string_flag' is defined as one type and declared as "
-      "another");
-}
-
-#endif
-
-// --------------------------------------------------------------------
-
-// A contrived type that offers implicit and explicit conversion from specific
-// source types.
-struct ConversionTestVal {
-  ConversionTestVal() = default;
-  explicit ConversionTestVal(int a_in) : a(a_in) {}
-
-  enum class ViaImplicitConv { kTen = 10, kEleven };
-  // NOLINTNEXTLINE
-  ConversionTestVal(ViaImplicitConv from) : a(static_cast<int>(from)) {}
-
-  int a;
-};
-
-bool AbslParseFlag(absl::string_view in, ConversionTestVal* val_out,
-                   std::string*) {
-  if (!absl::SimpleAtoi(in, &val_out->a)) {
-    return false;
-  }
-  return true;
-}
-std::string AbslUnparseFlag(const ConversionTestVal& val) {
-  return absl::StrCat(val.a);
-}
-
-}  // namespace
-
-// Flag default values can be specified with a value that converts to the flag
-// value type implicitly.
-ABSL_FLAG(ConversionTestVal, test_flag_implicit_conv,
-          ConversionTestVal::ViaImplicitConv::kTen,
-          "test flag init via implicit conversion");
-
-namespace {
-
-TEST_F(FlagTest, CanSetViaImplicitConversion) {
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_implicit_conv).a, 10);
-  absl::SetFlag(&FLAGS_test_flag_implicit_conv,
-                ConversionTestVal::ViaImplicitConv::kEleven);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_implicit_conv).a, 11);
-}
-
-// --------------------------------------------------------------------
-
-struct NonDfltConstructible {
- public:
-  // This constructor tests that we can initialize the flag with int value
-  NonDfltConstructible(int i) : value(i) {}  // NOLINT
-
-  // This constructor tests that we can't initialize the flag with char value
-  // but can with explicitly constructed NonDfltConstructible.
-  explicit NonDfltConstructible(char c) : value(100 + static_cast<int>(c)) {}
-
-  int value;
-};
-
-bool AbslParseFlag(absl::string_view in, NonDfltConstructible* ndc_out,
-                   std::string*) {
-  return absl::SimpleAtoi(in, &ndc_out->value);
-}
-std::string AbslUnparseFlag(const NonDfltConstructible& ndc) {
-  return absl::StrCat(ndc.value);
-}
-
-}  // namespace
-
-ABSL_FLAG(NonDfltConstructible, ndc_flag1, NonDfltConstructible('1'),
-          "Flag with non default constructible type");
-ABSL_FLAG(NonDfltConstructible, ndc_flag2, 0,
-          "Flag with non default constructible type");
-
-namespace {
-
-TEST_F(FlagTest, TestNonDefaultConstructibleType) {
-  EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag1).value, '1' + 100);
-  EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag2).value, 0);
-
-  absl::SetFlag(&FLAGS_ndc_flag1, NonDfltConstructible('A'));
-  absl::SetFlag(&FLAGS_ndc_flag2, 25);
-
-  EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag1).value, 'A' + 100);
-  EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag2).value, 25);
-}
-
-}  // namespace
-
-// --------------------------------------------------------------------
-
-ABSL_RETIRED_FLAG(bool, old_bool_flag, true, "old descr");
-ABSL_RETIRED_FLAG(int, old_int_flag, (int)std::sqrt(10), "old descr");
-ABSL_RETIRED_FLAG(std::string, old_str_flag, "", absl::StrCat("old ", "descr"));
-
-bool initializaion_order_fiasco_test = [] {
-  // Iterate over all the flags during static initialization.
-  // This should not trigger ASan's initialization-order-fiasco.
-  auto* handle1 = absl::FindCommandLineFlag("flag_on_separate_file");
-  auto* handle2 = absl::FindCommandLineFlag("retired_flag_on_separate_file");
-  if (handle1 != nullptr && handle2 != nullptr) {
-    return handle1->Name() == handle2->Name();
-  }
-  return true;
-}();
-
-namespace {
-
-TEST_F(FlagTest, TestRetiredFlagRegistration) {
-  auto* handle = absl::FindCommandLineFlag("old_bool_flag");
-  EXPECT_TRUE(handle->IsOfType<bool>());
-  EXPECT_TRUE(handle->IsRetired());
-  handle = absl::FindCommandLineFlag("old_int_flag");
-  EXPECT_TRUE(handle->IsOfType<int>());
-  EXPECT_TRUE(handle->IsRetired());
-  handle = absl::FindCommandLineFlag("old_str_flag");
-  EXPECT_TRUE(handle->IsOfType<std::string>());
-  EXPECT_TRUE(handle->IsRetired());
-}
-
-}  // namespace
-
-// --------------------------------------------------------------------
-
-namespace {
-
-// User-defined type with small alignment, but size exceeding 16.
-struct SmallAlignUDT {
-  SmallAlignUDT() : c('A'), s(12) {}
-  char c;
-  int16_t s;
-  char bytes[14];
-};
-
-bool AbslParseFlag(absl::string_view, SmallAlignUDT*, std::string*) {
-  return true;
-}
-std::string AbslUnparseFlag(const SmallAlignUDT&) { return ""; }
-
-// User-defined type with small size, but not trivially copyable.
-struct NonTriviallyCopyableUDT {
-  NonTriviallyCopyableUDT() : c('A') {}
-  NonTriviallyCopyableUDT(const NonTriviallyCopyableUDT& rhs) : c(rhs.c) {}
-  NonTriviallyCopyableUDT& operator=(const NonTriviallyCopyableUDT& rhs) {
-    c = rhs.c;
-    return *this;
-  }
-
-  char c;
-};
-
-bool AbslParseFlag(absl::string_view, NonTriviallyCopyableUDT*, std::string*) {
-  return true;
-}
-std::string AbslUnparseFlag(const NonTriviallyCopyableUDT&) { return ""; }
-
-}  // namespace
-
-ABSL_FLAG(SmallAlignUDT, test_flag_sa_udt, {}, "help");
-ABSL_FLAG(NonTriviallyCopyableUDT, test_flag_ntc_udt, {}, "help");
-
-namespace {
-
-TEST_F(FlagTest, TestSmallAlignUDT) {
-  SmallAlignUDT value = absl::GetFlag(FLAGS_test_flag_sa_udt);
-  EXPECT_EQ(value.c, 'A');
-  EXPECT_EQ(value.s, 12);
-
-  value.c = 'B';
-  value.s = 45;
-  absl::SetFlag(&FLAGS_test_flag_sa_udt, value);
-  value = absl::GetFlag(FLAGS_test_flag_sa_udt);
-  EXPECT_EQ(value.c, 'B');
-  EXPECT_EQ(value.s, 45);
-}
-
-TEST_F(FlagTest, TestNonTriviallyCopyableUDT) {
-  NonTriviallyCopyableUDT value = absl::GetFlag(FLAGS_test_flag_ntc_udt);
-  EXPECT_EQ(value.c, 'A');
-
-  value.c = 'B';
-  absl::SetFlag(&FLAGS_test_flag_ntc_udt, value);
-  value = absl::GetFlag(FLAGS_test_flag_ntc_udt);
-  EXPECT_EQ(value.c, 'B');
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/flags/flag_test_defs.cc b/third_party/abseil_cpp/absl/flags/flag_test_defs.cc
deleted file mode 100644
index 4e1693cdb9c4..000000000000
--- a/third_party/abseil_cpp/absl/flags/flag_test_defs.cc
+++ /dev/null
@@ -1,24 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// This file is used to test the mismatch of the flag type between definition
-// and declaration. These are definitions. flag_test.cc contains declarations.
-#include <string>
-#include "absl/flags/flag.h"
-
-ABSL_FLAG(int, mistyped_int_flag, 0, "");
-ABSL_FLAG(std::string, mistyped_string_flag, "", "");
-ABSL_FLAG(bool, flag_on_separate_file, false, "");
-ABSL_RETIRED_FLAG(bool, retired_flag_on_separate_file, false, "");
diff --git a/third_party/abseil_cpp/absl/flags/internal/commandlineflag.cc b/third_party/abseil_cpp/absl/flags/internal/commandlineflag.cc
deleted file mode 100644
index 4482955c4cb6..000000000000
--- a/third_party/abseil_cpp/absl/flags/internal/commandlineflag.cc
+++ /dev/null
@@ -1,26 +0,0 @@
-//
-// Copyright 2020 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/internal/commandlineflag.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-
-FlagStateInterface::~FlagStateInterface() {}
-
-}  // namespace flags_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/flags/internal/commandlineflag.h b/third_party/abseil_cpp/absl/flags/internal/commandlineflag.h
deleted file mode 100644
index cb46fe2e979d..000000000000
--- a/third_party/abseil_cpp/absl/flags/internal/commandlineflag.h
+++ /dev/null
@@ -1,68 +0,0 @@
-//
-// Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_FLAGS_INTERNAL_COMMANDLINEFLAG_H_
-#define ABSL_FLAGS_INTERNAL_COMMANDLINEFLAG_H_
-
-#include "absl/base/config.h"
-#include "absl/base/internal/fast_type_id.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-
-// An alias for flag fast type id. This value identifies the flag value type
-// simialarly to typeid(T), without relying on RTTI being available. In most
-// cases this id is enough to uniquely identify the flag's value type. In a few
-// cases we'll have to resort to using actual RTTI implementation if it is
-// available.
-using FlagFastTypeId = absl::base_internal::FastTypeIdType;
-
-// Options that control SetCommandLineOptionWithMode.
-enum FlagSettingMode {
-  // update the flag's value unconditionally (can call this multiple times).
-  SET_FLAGS_VALUE,
-  // update the flag's value, but *only if* it has not yet been updated
-  // with SET_FLAGS_VALUE, SET_FLAG_IF_DEFAULT, or "FLAGS_xxx = nondef".
-  SET_FLAG_IF_DEFAULT,
-  // set the flag's default value to this.  If the flag has not been updated
-  // yet (via SET_FLAGS_VALUE, SET_FLAG_IF_DEFAULT, or "FLAGS_xxx = nondef")
-  // change the flag's current value to the new default value as well.
-  SET_FLAGS_DEFAULT
-};
-
-// Options that control ParseFrom: Source of a value.
-enum ValueSource {
-  // Flag is being set by value specified on a command line.
-  kCommandLine,
-  // Flag is being set by value specified in the code.
-  kProgrammaticChange,
-};
-
-// Handle to FlagState objects. Specific flag state objects will restore state
-// of a flag produced this flag state from method CommandLineFlag::SaveState().
-class FlagStateInterface {
- public:
-  virtual ~FlagStateInterface();
-
-  // Restores the flag originated this object to the saved state.
-  virtual void Restore() const = 0;
-};
-
-}  // namespace flags_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_FLAGS_INTERNAL_COMMANDLINEFLAG_H_
diff --git a/third_party/abseil_cpp/absl/flags/internal/flag.cc b/third_party/abseil_cpp/absl/flags/internal/flag.cc
deleted file mode 100644
index 1502e7f11d36..000000000000
--- a/third_party/abseil_cpp/absl/flags/internal/flag.cc
+++ /dev/null
@@ -1,568 +0,0 @@
-//
-// Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/internal/flag.h"
-
-#include <assert.h>
-#include <stddef.h>
-#include <stdint.h>
-#include <string.h>
-
-#include <array>
-#include <atomic>
-#include <memory>
-#include <new>
-#include <string>
-#include <typeinfo>
-
-#include "absl/base/call_once.h"
-#include "absl/base/casts.h"
-#include "absl/base/config.h"
-#include "absl/base/optimization.h"
-#include "absl/flags/config.h"
-#include "absl/flags/internal/commandlineflag.h"
-#include "absl/flags/usage_config.h"
-#include "absl/memory/memory.h"
-#include "absl/strings/str_cat.h"
-#include "absl/strings/string_view.h"
-#include "absl/synchronization/mutex.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-
-// The help message indicating that the commandline flag has been
-// 'stripped'. It will not show up when doing "-help" and its
-// variants. The flag is stripped if ABSL_FLAGS_STRIP_HELP is set to 1
-// before including absl/flags/flag.h
-const char kStrippedFlagHelp[] = "\001\002\003\004 (unknown) \004\003\002\001";
-
-namespace {
-
-// Currently we only validate flag values for user-defined flag types.
-bool ShouldValidateFlagValue(FlagFastTypeId flag_type_id) {
-#define DONT_VALIDATE(T, _) \
-  if (flag_type_id == base_internal::FastTypeId<T>()) return false;
-  ABSL_FLAGS_INTERNAL_SUPPORTED_TYPES(DONT_VALIDATE)
-#undef DONT_VALIDATE
-
-  return true;
-}
-
-// RAII helper used to temporarily unlock and relock `absl::Mutex`.
-// This is used when we need to ensure that locks are released while
-// invoking user supplied callbacks and then reacquired, since callbacks may
-// need to acquire these locks themselves.
-class MutexRelock {
- public:
-  explicit MutexRelock(absl::Mutex& mu) : mu_(mu) { mu_.Unlock(); }
-  ~MutexRelock() { mu_.Lock(); }
-
-  MutexRelock(const MutexRelock&) = delete;
-  MutexRelock& operator=(const MutexRelock&) = delete;
-
- private:
-  absl::Mutex& mu_;
-};
-
-}  // namespace
-
-///////////////////////////////////////////////////////////////////////////////
-// Persistent state of the flag data.
-
-class FlagImpl;
-
-class FlagState : public flags_internal::FlagStateInterface {
- public:
-  template <typename V>
-  FlagState(FlagImpl& flag_impl, const V& v, bool modified,
-            bool on_command_line, int64_t counter)
-      : flag_impl_(flag_impl),
-        value_(v),
-        modified_(modified),
-        on_command_line_(on_command_line),
-        counter_(counter) {}
-
-  ~FlagState() override {
-    if (flag_impl_.ValueStorageKind() != FlagValueStorageKind::kAlignedBuffer)
-      return;
-    flags_internal::Delete(flag_impl_.op_, value_.heap_allocated);
-  }
-
- private:
-  friend class FlagImpl;
-
-  // Restores the flag to the saved state.
-  void Restore() const override {
-    if (!flag_impl_.RestoreState(*this)) return;
-
-    ABSL_INTERNAL_LOG(INFO,
-                      absl::StrCat("Restore saved value of ", flag_impl_.Name(),
-                                   " to: ", flag_impl_.CurrentValue()));
-  }
-
-  // Flag and saved flag data.
-  FlagImpl& flag_impl_;
-  union SavedValue {
-    explicit SavedValue(void* v) : heap_allocated(v) {}
-    explicit SavedValue(int64_t v) : one_word(v) {}
-    explicit SavedValue(flags_internal::AlignedTwoWords v) : two_words(v) {}
-
-    void* heap_allocated;
-    int64_t one_word;
-    flags_internal::AlignedTwoWords two_words;
-  } value_;
-  bool modified_;
-  bool on_command_line_;
-  int64_t counter_;
-};
-
-///////////////////////////////////////////////////////////////////////////////
-// Flag implementation, which does not depend on flag value type.
-
-DynValueDeleter::DynValueDeleter(FlagOpFn op_arg) : op(op_arg) {}
-
-void DynValueDeleter::operator()(void* ptr) const {
-  if (op == nullptr) return;
-
-  Delete(op, ptr);
-}
-
-void FlagImpl::Init() {
-  new (&data_guard_) absl::Mutex;
-
-  auto def_kind = static_cast<FlagDefaultKind>(def_kind_);
-
-  switch (ValueStorageKind()) {
-    case FlagValueStorageKind::kAlignedBuffer:
-      // For this storage kind the default_value_ always points to gen_func
-      // during initialization.
-      assert(def_kind == FlagDefaultKind::kGenFunc);
-      (*default_value_.gen_func)(AlignedBufferValue());
-      break;
-    case FlagValueStorageKind::kOneWordAtomic: {
-      alignas(int64_t) std::array<char, sizeof(int64_t)> buf{};
-      if (def_kind == FlagDefaultKind::kGenFunc) {
-        (*default_value_.gen_func)(buf.data());
-      } else {
-        assert(def_kind != FlagDefaultKind::kDynamicValue);
-        std::memcpy(buf.data(), &default_value_, Sizeof(op_));
-      }
-      OneWordValue().store(absl::bit_cast<int64_t>(buf),
-                           std::memory_order_release);
-      break;
-    }
-    case FlagValueStorageKind::kTwoWordsAtomic: {
-      // For this storage kind the default_value_ always points to gen_func
-      // during initialization.
-      assert(def_kind == FlagDefaultKind::kGenFunc);
-      alignas(AlignedTwoWords) std::array<char, sizeof(AlignedTwoWords)> buf{};
-      (*default_value_.gen_func)(buf.data());
-      auto atomic_value = absl::bit_cast<AlignedTwoWords>(buf);
-      TwoWordsValue().store(atomic_value, std::memory_order_release);
-      break;
-    }
-  }
-}
-
-absl::Mutex* FlagImpl::DataGuard() const {
-  absl::call_once(const_cast<FlagImpl*>(this)->init_control_, &FlagImpl::Init,
-                  const_cast<FlagImpl*>(this));
-
-  // data_guard_ is initialized inside Init.
-  return reinterpret_cast<absl::Mutex*>(&data_guard_);
-}
-
-void FlagImpl::AssertValidType(FlagFastTypeId rhs_type_id,
-                               const std::type_info* (*gen_rtti)()) const {
-  FlagFastTypeId lhs_type_id = flags_internal::FastTypeId(op_);
-
-  // `rhs_type_id` is the fast type id corresponding to the declaration
-  // visibile at the call site. `lhs_type_id` is the fast type id
-  // corresponding to the type specified in flag definition. They must match
-  //  for this operation to be well-defined.
-  if (ABSL_PREDICT_TRUE(lhs_type_id == rhs_type_id)) return;
-
-  const std::type_info* lhs_runtime_type_id =
-      flags_internal::RuntimeTypeId(op_);
-  const std::type_info* rhs_runtime_type_id = (*gen_rtti)();
-
-  if (lhs_runtime_type_id == rhs_runtime_type_id) return;
-
-#if defined(ABSL_FLAGS_INTERNAL_HAS_RTTI)
-  if (*lhs_runtime_type_id == *rhs_runtime_type_id) return;
-#endif
-
-  ABSL_INTERNAL_LOG(
-      FATAL, absl::StrCat("Flag '", Name(),
-                          "' is defined as one type and declared as another"));
-}
-
-std::unique_ptr<void, DynValueDeleter> FlagImpl::MakeInitValue() const {
-  void* res = nullptr;
-  switch (DefaultKind()) {
-    case FlagDefaultKind::kDynamicValue:
-      res = flags_internal::Clone(op_, default_value_.dynamic_value);
-      break;
-    case FlagDefaultKind::kGenFunc:
-      res = flags_internal::Alloc(op_);
-      (*default_value_.gen_func)(res);
-      break;
-    default:
-      res = flags_internal::Clone(op_, &default_value_);
-      break;
-  }
-  return {res, DynValueDeleter{op_}};
-}
-
-void FlagImpl::StoreValue(const void* src) {
-  switch (ValueStorageKind()) {
-    case FlagValueStorageKind::kAlignedBuffer:
-      Copy(op_, src, AlignedBufferValue());
-      break;
-    case FlagValueStorageKind::kOneWordAtomic: {
-      int64_t one_word_val = 0;
-      std::memcpy(&one_word_val, src, Sizeof(op_));
-      OneWordValue().store(one_word_val, std::memory_order_release);
-      break;
-    }
-    case FlagValueStorageKind::kTwoWordsAtomic: {
-      AlignedTwoWords two_words_val{0, 0};
-      std::memcpy(&two_words_val, src, Sizeof(op_));
-      TwoWordsValue().store(two_words_val, std::memory_order_release);
-      break;
-    }
-  }
-
-  modified_ = true;
-  ++counter_;
-  InvokeCallback();
-}
-
-absl::string_view FlagImpl::Name() const { return name_; }
-
-std::string FlagImpl::Filename() const {
-  return flags_internal::GetUsageConfig().normalize_filename(filename_);
-}
-
-std::string FlagImpl::Help() const {
-  return HelpSourceKind() == FlagHelpKind::kLiteral ? help_.literal
-                                                    : help_.gen_func();
-}
-
-FlagFastTypeId FlagImpl::TypeId() const {
-  return flags_internal::FastTypeId(op_);
-}
-
-bool FlagImpl::IsSpecifiedOnCommandLine() const {
-  absl::MutexLock l(DataGuard());
-  return on_command_line_;
-}
-
-std::string FlagImpl::DefaultValue() const {
-  absl::MutexLock l(DataGuard());
-
-  auto obj = MakeInitValue();
-  return flags_internal::Unparse(op_, obj.get());
-}
-
-std::string FlagImpl::CurrentValue() const {
-  auto* guard = DataGuard();  // Make sure flag initialized
-  switch (ValueStorageKind()) {
-    case FlagValueStorageKind::kAlignedBuffer: {
-      absl::MutexLock l(guard);
-      return flags_internal::Unparse(op_, AlignedBufferValue());
-    }
-    case FlagValueStorageKind::kOneWordAtomic: {
-      const auto one_word_val =
-          absl::bit_cast<std::array<char, sizeof(int64_t)>>(
-              OneWordValue().load(std::memory_order_acquire));
-      return flags_internal::Unparse(op_, one_word_val.data());
-    }
-    case FlagValueStorageKind::kTwoWordsAtomic: {
-      const auto two_words_val =
-          absl::bit_cast<std::array<char, sizeof(AlignedTwoWords)>>(
-              TwoWordsValue().load(std::memory_order_acquire));
-      return flags_internal::Unparse(op_, two_words_val.data());
-    }
-  }
-
-  return "";
-}
-
-void FlagImpl::SetCallback(const FlagCallbackFunc mutation_callback) {
-  absl::MutexLock l(DataGuard());
-
-  if (callback_ == nullptr) {
-    callback_ = new FlagCallback;
-  }
-  callback_->func = mutation_callback;
-
-  InvokeCallback();
-}
-
-void FlagImpl::InvokeCallback() const {
-  if (!callback_) return;
-
-  // Make a copy of the C-style function pointer that we are about to invoke
-  // before we release the lock guarding it.
-  FlagCallbackFunc cb = callback_->func;
-
-  // If the flag has a mutation callback this function invokes it. While the
-  // callback is being invoked the primary flag's mutex is unlocked and it is
-  // re-locked back after call to callback is completed. Callback invocation is
-  // guarded by flag's secondary mutex instead which prevents concurrent
-  // callback invocation. Note that it is possible for other thread to grab the
-  // primary lock and update flag's value at any time during the callback
-  // invocation. This is by design. Callback can get a value of the flag if
-  // necessary, but it might be different from the value initiated the callback
-  // and it also can be different by the time the callback invocation is
-  // completed. Requires that *primary_lock be held in exclusive mode; it may be
-  // released and reacquired by the implementation.
-  MutexRelock relock(*DataGuard());
-  absl::MutexLock lock(&callback_->guard);
-  cb();
-}
-
-std::unique_ptr<FlagStateInterface> FlagImpl::SaveState() {
-  absl::MutexLock l(DataGuard());
-
-  bool modified = modified_;
-  bool on_command_line = on_command_line_;
-  switch (ValueStorageKind()) {
-    case FlagValueStorageKind::kAlignedBuffer: {
-      return absl::make_unique<FlagState>(
-          *this, flags_internal::Clone(op_, AlignedBufferValue()), modified,
-          on_command_line, counter_);
-    }
-    case FlagValueStorageKind::kOneWordAtomic: {
-      return absl::make_unique<FlagState>(
-          *this, OneWordValue().load(std::memory_order_acquire), modified,
-          on_command_line, counter_);
-    }
-    case FlagValueStorageKind::kTwoWordsAtomic: {
-      return absl::make_unique<FlagState>(
-          *this, TwoWordsValue().load(std::memory_order_acquire), modified,
-          on_command_line, counter_);
-    }
-  }
-  return nullptr;
-}
-
-bool FlagImpl::RestoreState(const FlagState& flag_state) {
-  absl::MutexLock l(DataGuard());
-
-  if (flag_state.counter_ == counter_) {
-    return false;
-  }
-
-  switch (ValueStorageKind()) {
-    case FlagValueStorageKind::kAlignedBuffer:
-      StoreValue(flag_state.value_.heap_allocated);
-      break;
-    case FlagValueStorageKind::kOneWordAtomic:
-      StoreValue(&flag_state.value_.one_word);
-      break;
-    case FlagValueStorageKind::kTwoWordsAtomic:
-      StoreValue(&flag_state.value_.two_words);
-      break;
-  }
-
-  modified_ = flag_state.modified_;
-  on_command_line_ = flag_state.on_command_line_;
-
-  return true;
-}
-
-template <typename StorageT>
-StorageT* FlagImpl::OffsetValue() const {
-  char* p = reinterpret_cast<char*>(const_cast<FlagImpl*>(this));
-  // The offset is deduced via Flag value type specific op_.
-  size_t offset = flags_internal::ValueOffset(op_);
-
-  return reinterpret_cast<StorageT*>(p + offset);
-}
-
-void* FlagImpl::AlignedBufferValue() const {
-  assert(ValueStorageKind() == FlagValueStorageKind::kAlignedBuffer);
-  return OffsetValue<void>();
-}
-
-std::atomic<int64_t>& FlagImpl::OneWordValue() const {
-  assert(ValueStorageKind() == FlagValueStorageKind::kOneWordAtomic);
-  return OffsetValue<FlagOneWordValue>()->value;
-}
-
-std::atomic<AlignedTwoWords>& FlagImpl::TwoWordsValue() const {
-  assert(ValueStorageKind() == FlagValueStorageKind::kTwoWordsAtomic);
-  return OffsetValue<FlagTwoWordsValue>()->value;
-}
-
-// Attempts to parse supplied `value` string using parsing routine in the `flag`
-// argument. If parsing successful, this function replaces the dst with newly
-// parsed value. In case if any error is encountered in either step, the error
-// message is stored in 'err'
-std::unique_ptr<void, DynValueDeleter> FlagImpl::TryParse(
-    absl::string_view value, std::string& err) const {
-  std::unique_ptr<void, DynValueDeleter> tentative_value = MakeInitValue();
-
-  std::string parse_err;
-  if (!flags_internal::Parse(op_, value, tentative_value.get(), &parse_err)) {
-    absl::string_view err_sep = parse_err.empty() ? "" : "; ";
-    err = absl::StrCat("Illegal value '", value, "' specified for flag '",
-                       Name(), "'", err_sep, parse_err);
-    return nullptr;
-  }
-
-  return tentative_value;
-}
-
-void FlagImpl::Read(void* dst) const {
-  auto* guard = DataGuard();  // Make sure flag initialized
-  switch (ValueStorageKind()) {
-    case FlagValueStorageKind::kAlignedBuffer: {
-      absl::MutexLock l(guard);
-      flags_internal::CopyConstruct(op_, AlignedBufferValue(), dst);
-      break;
-    }
-    case FlagValueStorageKind::kOneWordAtomic: {
-      const int64_t one_word_val =
-          OneWordValue().load(std::memory_order_acquire);
-      std::memcpy(dst, &one_word_val, Sizeof(op_));
-      break;
-    }
-    case FlagValueStorageKind::kTwoWordsAtomic: {
-      const AlignedTwoWords two_words_val =
-          TwoWordsValue().load(std::memory_order_acquire);
-      std::memcpy(dst, &two_words_val, Sizeof(op_));
-      break;
-    }
-  }
-}
-
-void FlagImpl::Write(const void* src) {
-  absl::MutexLock l(DataGuard());
-
-  if (ShouldValidateFlagValue(flags_internal::FastTypeId(op_))) {
-    std::unique_ptr<void, DynValueDeleter> obj{flags_internal::Clone(op_, src),
-                                               DynValueDeleter{op_}};
-    std::string ignored_error;
-    std::string src_as_str = flags_internal::Unparse(op_, src);
-    if (!flags_internal::Parse(op_, src_as_str, obj.get(), &ignored_error)) {
-      ABSL_INTERNAL_LOG(ERROR, absl::StrCat("Attempt to set flag '", Name(),
-                                            "' to invalid value ", src_as_str));
-    }
-  }
-
-  StoreValue(src);
-}
-
-// Sets the value of the flag based on specified string `value`. If the flag
-// was successfully set to new value, it returns true. Otherwise, sets `err`
-// to indicate the error, leaves the flag unchanged, and returns false. There
-// are three ways to set the flag's value:
-//  * Update the current flag value
-//  * Update the flag's default value
-//  * Update the current flag value if it was never set before
-// The mode is selected based on 'set_mode' parameter.
-bool FlagImpl::ParseFrom(absl::string_view value, FlagSettingMode set_mode,
-                         ValueSource source, std::string& err) {
-  absl::MutexLock l(DataGuard());
-
-  switch (set_mode) {
-    case SET_FLAGS_VALUE: {
-      // set or modify the flag's value
-      auto tentative_value = TryParse(value, err);
-      if (!tentative_value) return false;
-
-      StoreValue(tentative_value.get());
-
-      if (source == kCommandLine) {
-        on_command_line_ = true;
-      }
-      break;
-    }
-    case SET_FLAG_IF_DEFAULT: {
-      // set the flag's value, but only if it hasn't been set by someone else
-      if (modified_) {
-        // TODO(rogeeff): review and fix this semantic. Currently we do not fail
-        // in this case if flag is modified. This is misleading since the flag's
-        // value is not updated even though we return true.
-        // *err = absl::StrCat(Name(), " is already set to ",
-        //                     CurrentValue(), "\n");
-        // return false;
-        return true;
-      }
-      auto tentative_value = TryParse(value, err);
-      if (!tentative_value) return false;
-
-      StoreValue(tentative_value.get());
-      break;
-    }
-    case SET_FLAGS_DEFAULT: {
-      auto tentative_value = TryParse(value, err);
-      if (!tentative_value) return false;
-
-      if (DefaultKind() == FlagDefaultKind::kDynamicValue) {
-        void* old_value = default_value_.dynamic_value;
-        default_value_.dynamic_value = tentative_value.release();
-        tentative_value.reset(old_value);
-      } else {
-        default_value_.dynamic_value = tentative_value.release();
-        def_kind_ = static_cast<uint8_t>(FlagDefaultKind::kDynamicValue);
-      }
-
-      if (!modified_) {
-        // Need to set both default value *and* current, in this case.
-        StoreValue(default_value_.dynamic_value);
-        modified_ = false;
-      }
-      break;
-    }
-  }
-
-  return true;
-}
-
-void FlagImpl::CheckDefaultValueParsingRoundtrip() const {
-  std::string v = DefaultValue();
-
-  absl::MutexLock lock(DataGuard());
-
-  auto dst = MakeInitValue();
-  std::string error;
-  if (!flags_internal::Parse(op_, v, dst.get(), &error)) {
-    ABSL_INTERNAL_LOG(
-        FATAL,
-        absl::StrCat("Flag ", Name(), " (from ", Filename(),
-                     "): string form of default value '", v,
-                     "' could not be parsed; error=", error));
-  }
-
-  // We do not compare dst to def since parsing/unparsing may make
-  // small changes, e.g., precision loss for floating point types.
-}
-
-bool FlagImpl::ValidateInputValue(absl::string_view value) const {
-  absl::MutexLock l(DataGuard());
-
-  auto obj = MakeInitValue();
-  std::string ignored_error;
-  return flags_internal::Parse(op_, value, obj.get(), &ignored_error);
-}
-
-}  // namespace flags_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/flags/internal/flag.h b/third_party/abseil_cpp/absl/flags/internal/flag.h
deleted file mode 100644
index 370d8a02ef04..000000000000
--- a/third_party/abseil_cpp/absl/flags/internal/flag.h
+++ /dev/null
@@ -1,775 +0,0 @@
-//
-// Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_FLAGS_INTERNAL_FLAG_H_
-#define ABSL_FLAGS_INTERNAL_FLAG_H_
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include <atomic>
-#include <cstring>
-#include <memory>
-#include <new>
-#include <string>
-#include <type_traits>
-#include <typeinfo>
-
-#include "absl/base/attributes.h"
-#include "absl/base/call_once.h"
-#include "absl/base/config.h"
-#include "absl/base/optimization.h"
-#include "absl/base/thread_annotations.h"
-#include "absl/flags/commandlineflag.h"
-#include "absl/flags/config.h"
-#include "absl/flags/internal/commandlineflag.h"
-#include "absl/flags/internal/registry.h"
-#include "absl/flags/marshalling.h"
-#include "absl/meta/type_traits.h"
-#include "absl/strings/string_view.h"
-#include "absl/synchronization/mutex.h"
-#include "absl/utility/utility.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-
-///////////////////////////////////////////////////////////////////////////////
-// Forward declaration of absl::Flag<T> public API.
-namespace flags_internal {
-template <typename T>
-class Flag;
-}  // namespace flags_internal
-
-#if defined(_MSC_VER) && !defined(__clang__)
-template <typename T>
-class Flag;
-#else
-template <typename T>
-using Flag = flags_internal::Flag<T>;
-#endif
-
-template <typename T>
-ABSL_MUST_USE_RESULT T GetFlag(const absl::Flag<T>& flag);
-
-template <typename T>
-void SetFlag(absl::Flag<T>* flag, const T& v);
-
-template <typename T, typename V>
-void SetFlag(absl::Flag<T>* flag, const V& v);
-
-template <typename U>
-const CommandLineFlag& GetFlagReflectionHandle(const absl::Flag<U>& f);
-
-///////////////////////////////////////////////////////////////////////////////
-// Flag value type operations, eg., parsing, copying, etc. are provided
-// by function specific to that type with a signature matching FlagOpFn.
-
-namespace flags_internal {
-
-enum class FlagOp {
-  kAlloc,
-  kDelete,
-  kCopy,
-  kCopyConstruct,
-  kSizeof,
-  kFastTypeId,
-  kRuntimeTypeId,
-  kParse,
-  kUnparse,
-  kValueOffset,
-};
-using FlagOpFn = void* (*)(FlagOp, const void*, void*, void*);
-
-// Forward declaration for Flag value specific operations.
-template <typename T>
-void* FlagOps(FlagOp op, const void* v1, void* v2, void* v3);
-
-// Allocate aligned memory for a flag value.
-inline void* Alloc(FlagOpFn op) {
-  return op(FlagOp::kAlloc, nullptr, nullptr, nullptr);
-}
-// Deletes memory interpreting obj as flag value type pointer.
-inline void Delete(FlagOpFn op, void* obj) {
-  op(FlagOp::kDelete, nullptr, obj, nullptr);
-}
-// Copies src to dst interpreting as flag value type pointers.
-inline void Copy(FlagOpFn op, const void* src, void* dst) {
-  op(FlagOp::kCopy, src, dst, nullptr);
-}
-// Construct a copy of flag value in a location pointed by dst
-// based on src - pointer to the flag's value.
-inline void CopyConstruct(FlagOpFn op, const void* src, void* dst) {
-  op(FlagOp::kCopyConstruct, src, dst, nullptr);
-}
-// Makes a copy of flag value pointed by obj.
-inline void* Clone(FlagOpFn op, const void* obj) {
-  void* res = flags_internal::Alloc(op);
-  flags_internal::CopyConstruct(op, obj, res);
-  return res;
-}
-// Returns true if parsing of input text is successfull.
-inline bool Parse(FlagOpFn op, absl::string_view text, void* dst,
-                  std::string* error) {
-  return op(FlagOp::kParse, &text, dst, error) != nullptr;
-}
-// Returns string representing supplied value.
-inline std::string Unparse(FlagOpFn op, const void* val) {
-  std::string result;
-  op(FlagOp::kUnparse, val, &result, nullptr);
-  return result;
-}
-// Returns size of flag value type.
-inline size_t Sizeof(FlagOpFn op) {
-  // This sequence of casts reverses the sequence from
-  // `flags_internal::FlagOps()`
-  return static_cast<size_t>(reinterpret_cast<intptr_t>(
-      op(FlagOp::kSizeof, nullptr, nullptr, nullptr)));
-}
-// Returns fast type id coresponding to the value type.
-inline FlagFastTypeId FastTypeId(FlagOpFn op) {
-  return reinterpret_cast<FlagFastTypeId>(
-      op(FlagOp::kFastTypeId, nullptr, nullptr, nullptr));
-}
-// Returns fast type id coresponding to the value type.
-inline const std::type_info* RuntimeTypeId(FlagOpFn op) {
-  return reinterpret_cast<const std::type_info*>(
-      op(FlagOp::kRuntimeTypeId, nullptr, nullptr, nullptr));
-}
-// Returns offset of the field value_ from the field impl_ inside of
-// absl::Flag<T> data. Given FlagImpl pointer p you can get the
-// location of the corresponding value as:
-//      reinterpret_cast<char*>(p) + ValueOffset().
-inline ptrdiff_t ValueOffset(FlagOpFn op) {
-  // This sequence of casts reverses the sequence from
-  // `flags_internal::FlagOps()`
-  return static_cast<ptrdiff_t>(reinterpret_cast<intptr_t>(
-      op(FlagOp::kValueOffset, nullptr, nullptr, nullptr)));
-}
-
-// Returns an address of RTTI's typeid(T).
-template <typename T>
-inline const std::type_info* GenRuntimeTypeId() {
-#if defined(ABSL_FLAGS_INTERNAL_HAS_RTTI)
-  return &typeid(T);
-#else
-  return nullptr;
-#endif
-}
-
-///////////////////////////////////////////////////////////////////////////////
-// Flag help auxiliary structs.
-
-// This is help argument for absl::Flag encapsulating the string literal pointer
-// or pointer to function generating it as well as enum descriminating two
-// cases.
-using HelpGenFunc = std::string (*)();
-
-template <size_t N>
-struct FixedCharArray {
-  char value[N];
-
-  template <size_t... I>
-  static constexpr FixedCharArray<N> FromLiteralString(
-      absl::string_view str, absl::index_sequence<I...>) {
-    return (void)str, FixedCharArray<N>({{str[I]..., '\0'}});
-  }
-};
-
-template <typename Gen, size_t N = Gen::Value().size()>
-constexpr FixedCharArray<N + 1> HelpStringAsArray(int) {
-  return FixedCharArray<N + 1>::FromLiteralString(
-      Gen::Value(), absl::make_index_sequence<N>{});
-}
-
-template <typename Gen>
-constexpr std::false_type HelpStringAsArray(char) {
-  return std::false_type{};
-}
-
-union FlagHelpMsg {
-  constexpr explicit FlagHelpMsg(const char* help_msg) : literal(help_msg) {}
-  constexpr explicit FlagHelpMsg(HelpGenFunc help_gen) : gen_func(help_gen) {}
-
-  const char* literal;
-  HelpGenFunc gen_func;
-};
-
-enum class FlagHelpKind : uint8_t { kLiteral = 0, kGenFunc = 1 };
-
-struct FlagHelpArg {
-  FlagHelpMsg source;
-  FlagHelpKind kind;
-};
-
-extern const char kStrippedFlagHelp[];
-
-// These two HelpArg overloads allows us to select at compile time one of two
-// way to pass Help argument to absl::Flag. We'll be passing
-// AbslFlagHelpGenFor##name as Gen and integer 0 as a single argument to prefer
-// first overload if possible. If help message is evaluatable on constexpr
-// context We'll be able to make FixedCharArray out of it and we'll choose first
-// overload. In this case the help message expression is immediately evaluated
-// and is used to construct the absl::Flag. No additionl code is generated by
-// ABSL_FLAG Otherwise SFINAE kicks in and first overload is dropped from the
-// consideration, in which case the second overload will be used. The second
-// overload does not attempt to evaluate the help message expression
-// immediately and instead delays the evaluation by returing the function
-// pointer (&T::NonConst) genering the help message when necessary. This is
-// evaluatable in constexpr context, but the cost is an extra function being
-// generated in the ABSL_FLAG code.
-template <typename Gen, size_t N>
-constexpr FlagHelpArg HelpArg(const FixedCharArray<N>& value) {
-  return {FlagHelpMsg(value.value), FlagHelpKind::kLiteral};
-}
-
-template <typename Gen>
-constexpr FlagHelpArg HelpArg(std::false_type) {
-  return {FlagHelpMsg(&Gen::NonConst), FlagHelpKind::kGenFunc};
-}
-
-///////////////////////////////////////////////////////////////////////////////
-// Flag default value auxiliary structs.
-
-// Signature for the function generating the initial flag value (usually
-// based on default value supplied in flag's definition)
-using FlagDfltGenFunc = void (*)(void*);
-
-union FlagDefaultSrc {
-  constexpr explicit FlagDefaultSrc(FlagDfltGenFunc gen_func_arg)
-      : gen_func(gen_func_arg) {}
-
-#define ABSL_FLAGS_INTERNAL_DFLT_FOR_TYPE(T, name) \
-  T name##_value;                                  \
-  constexpr explicit FlagDefaultSrc(T value) : name##_value(value) {}  // NOLINT
-  ABSL_FLAGS_INTERNAL_BUILTIN_TYPES(ABSL_FLAGS_INTERNAL_DFLT_FOR_TYPE)
-#undef ABSL_FLAGS_INTERNAL_DFLT_FOR_TYPE
-
-  void* dynamic_value;
-  FlagDfltGenFunc gen_func;
-};
-
-enum class FlagDefaultKind : uint8_t {
-  kDynamicValue = 0,
-  kGenFunc = 1,
-  kOneWord = 2  // for default values UP to one word in size
-};
-
-struct FlagDefaultArg {
-  FlagDefaultSrc source;
-  FlagDefaultKind kind;
-};
-
-// This struct and corresponding overload to InitDefaultValue are used to
-// facilitate usage of {} as default value in ABSL_FLAG macro.
-// TODO(rogeeff): Fix handling types with explicit constructors.
-struct EmptyBraces {};
-
-template <typename T>
-constexpr T InitDefaultValue(T t) {
-  return t;
-}
-
-template <typename T>
-constexpr T InitDefaultValue(EmptyBraces) {
-  return T{};
-}
-
-template <typename ValueT, typename GenT,
-          typename std::enable_if<std::is_integral<ValueT>::value, int>::type =
-              (GenT{}, 0)>
-constexpr FlagDefaultArg DefaultArg(int) {
-  return {FlagDefaultSrc(GenT{}.value), FlagDefaultKind::kOneWord};
-}
-
-template <typename ValueT, typename GenT>
-constexpr FlagDefaultArg DefaultArg(char) {
-  return {FlagDefaultSrc(&GenT::Gen), FlagDefaultKind::kGenFunc};
-}
-
-///////////////////////////////////////////////////////////////////////////////
-// Flag current value auxiliary structs.
-
-constexpr int64_t UninitializedFlagValue() { return 0xababababababababll; }
-
-template <typename T>
-using FlagUseOneWordStorage = std::integral_constant<
-    bool, absl::type_traits_internal::is_trivially_copyable<T>::value &&
-              (sizeof(T) <= 8)>;
-
-#if defined(ABSL_FLAGS_INTERNAL_ATOMIC_DOUBLE_WORD)
-// Clang does not always produce cmpxchg16b instruction when alignment of a 16
-// bytes type is not 16.
-struct alignas(16) AlignedTwoWords {
-  int64_t first;
-  int64_t second;
-
-  bool IsInitialized() const {
-    return first != flags_internal::UninitializedFlagValue();
-  }
-};
-
-template <typename T>
-using FlagUseTwoWordsStorage = std::integral_constant<
-    bool, absl::type_traits_internal::is_trivially_copyable<T>::value &&
-              (sizeof(T) > 8) && (sizeof(T) <= 16)>;
-#else
-// This is actually unused and only here to avoid ifdefs in other palces.
-struct AlignedTwoWords {
-  constexpr AlignedTwoWords() noexcept : dummy() {}
-  constexpr AlignedTwoWords(int64_t, int64_t) noexcept : dummy() {}
-  char dummy;
-
-  bool IsInitialized() const {
-    std::abort();
-    return true;
-  }
-};
-
-// This trait should be type dependent, otherwise SFINAE below will fail
-template <typename T>
-using FlagUseTwoWordsStorage =
-    std::integral_constant<bool, sizeof(T) != sizeof(T)>;
-#endif
-
-template <typename T>
-using FlagUseBufferStorage =
-    std::integral_constant<bool, !FlagUseOneWordStorage<T>::value &&
-                                     !FlagUseTwoWordsStorage<T>::value>;
-
-enum class FlagValueStorageKind : uint8_t {
-  kAlignedBuffer = 0,
-  kOneWordAtomic = 1,
-  kTwoWordsAtomic = 2
-};
-
-template <typename T>
-static constexpr FlagValueStorageKind StorageKind() {
-  return FlagUseBufferStorage<T>::value
-             ? FlagValueStorageKind::kAlignedBuffer
-             : FlagUseOneWordStorage<T>::value
-                   ? FlagValueStorageKind::kOneWordAtomic
-                   : FlagValueStorageKind::kTwoWordsAtomic;
-}
-
-struct FlagOneWordValue {
-  constexpr FlagOneWordValue() : value(UninitializedFlagValue()) {}
-
-  std::atomic<int64_t> value;
-};
-
-struct FlagTwoWordsValue {
-  constexpr FlagTwoWordsValue()
-      : value(AlignedTwoWords{UninitializedFlagValue(), 0}) {}
-
-  std::atomic<AlignedTwoWords> value;
-};
-
-template <typename T,
-          FlagValueStorageKind Kind = flags_internal::StorageKind<T>()>
-struct FlagValue;
-
-template <typename T>
-struct FlagValue<T, FlagValueStorageKind::kAlignedBuffer> {
-  bool Get(T&) const { return false; }
-
-  alignas(T) char value[sizeof(T)];
-};
-
-template <typename T>
-struct FlagValue<T, FlagValueStorageKind::kOneWordAtomic> : FlagOneWordValue {
-  bool Get(T& dst) const {
-    int64_t one_word_val = value.load(std::memory_order_acquire);
-    if (ABSL_PREDICT_FALSE(one_word_val == UninitializedFlagValue())) {
-      return false;
-    }
-    std::memcpy(&dst, static_cast<const void*>(&one_word_val), sizeof(T));
-    return true;
-  }
-};
-
-template <typename T>
-struct FlagValue<T, FlagValueStorageKind::kTwoWordsAtomic> : FlagTwoWordsValue {
-  bool Get(T& dst) const {
-    AlignedTwoWords two_words_val = value.load(std::memory_order_acquire);
-    if (ABSL_PREDICT_FALSE(!two_words_val.IsInitialized())) {
-      return false;
-    }
-    std::memcpy(&dst, static_cast<const void*>(&two_words_val), sizeof(T));
-    return true;
-  }
-};
-
-///////////////////////////////////////////////////////////////////////////////
-// Flag callback auxiliary structs.
-
-// Signature for the mutation callback used by watched Flags
-// The callback is noexcept.
-// TODO(rogeeff): add noexcept after C++17 support is added.
-using FlagCallbackFunc = void (*)();
-
-struct FlagCallback {
-  FlagCallbackFunc func;
-  absl::Mutex guard;  // Guard for concurrent callback invocations.
-};
-
-///////////////////////////////////////////////////////////////////////////////
-// Flag implementation, which does not depend on flag value type.
-// The class encapsulates the Flag's data and access to it.
-
-struct DynValueDeleter {
-  explicit DynValueDeleter(FlagOpFn op_arg = nullptr);
-  void operator()(void* ptr) const;
-
-  FlagOpFn op;
-};
-
-class FlagState;
-
-class FlagImpl final : public CommandLineFlag {
- public:
-  constexpr FlagImpl(const char* name, const char* filename, FlagOpFn op,
-                     FlagHelpArg help, FlagValueStorageKind value_kind,
-                     FlagDefaultArg default_arg)
-      : name_(name),
-        filename_(filename),
-        op_(op),
-        help_(help.source),
-        help_source_kind_(static_cast<uint8_t>(help.kind)),
-        value_storage_kind_(static_cast<uint8_t>(value_kind)),
-        def_kind_(static_cast<uint8_t>(default_arg.kind)),
-        modified_(false),
-        on_command_line_(false),
-        counter_(0),
-        callback_(nullptr),
-        default_value_(default_arg.source),
-        data_guard_{} {}
-
-  // Constant access methods
-  void Read(void* dst) const override ABSL_LOCKS_EXCLUDED(*DataGuard());
-
-  // Mutating access methods
-  void Write(const void* src) ABSL_LOCKS_EXCLUDED(*DataGuard());
-
-  // Interfaces to operate on callbacks.
-  void SetCallback(const FlagCallbackFunc mutation_callback)
-      ABSL_LOCKS_EXCLUDED(*DataGuard());
-  void InvokeCallback() const ABSL_EXCLUSIVE_LOCKS_REQUIRED(*DataGuard());
-
-  // Used in read/write operations to validate source/target has correct type.
-  // For example if flag is declared as absl::Flag<int> FLAGS_foo, a call to
-  // absl::GetFlag(FLAGS_foo) validates that the type of FLAGS_foo is indeed
-  // int. To do that we pass the "assumed" type id (which is deduced from type
-  // int) as an argument `type_id`, which is in turn is validated against the
-  // type id stored in flag object by flag definition statement.
-  void AssertValidType(FlagFastTypeId type_id,
-                       const std::type_info* (*gen_rtti)()) const;
-
- private:
-  template <typename T>
-  friend class Flag;
-  friend class FlagState;
-
-  // Ensures that `data_guard_` is initialized and returns it.
-  absl::Mutex* DataGuard() const
-      ABSL_LOCK_RETURNED(reinterpret_cast<absl::Mutex*>(data_guard_));
-  // Returns heap allocated value of type T initialized with default value.
-  std::unique_ptr<void, DynValueDeleter> MakeInitValue() const
-      ABSL_EXCLUSIVE_LOCKS_REQUIRED(*DataGuard());
-  // Flag initialization called via absl::call_once.
-  void Init();
-
-  // Offset value access methods. One per storage kind. These methods to not
-  // respect const correctness, so be very carefull using them.
-
-  // This is a shared helper routine which encapsulates most of the magic. Since
-  // it is only used inside the three routines below, which are defined in
-  // flag.cc, we can define it in that file as well.
-  template <typename StorageT>
-  StorageT* OffsetValue() const;
-  // This is an accessor for a value stored in an aligned buffer storage.
-  // Returns a mutable pointer to the start of a buffer.
-  void* AlignedBufferValue() const;
-  // This is an accessor for a value stored as one word atomic. Returns a
-  // mutable reference to an atomic value.
-  std::atomic<int64_t>& OneWordValue() const;
-  // This is an accessor for a value stored as two words atomic. Returns a
-  // mutable reference to an atomic value.
-  std::atomic<AlignedTwoWords>& TwoWordsValue() const;
-
-  // Attempts to parse supplied `value` string. If parsing is successful,
-  // returns new value. Otherwise returns nullptr.
-  std::unique_ptr<void, DynValueDeleter> TryParse(absl::string_view value,
-                                                  std::string& err) const
-      ABSL_EXCLUSIVE_LOCKS_REQUIRED(*DataGuard());
-  // Stores the flag value based on the pointer to the source.
-  void StoreValue(const void* src) ABSL_EXCLUSIVE_LOCKS_REQUIRED(*DataGuard());
-
-  FlagHelpKind HelpSourceKind() const {
-    return static_cast<FlagHelpKind>(help_source_kind_);
-  }
-  FlagValueStorageKind ValueStorageKind() const {
-    return static_cast<FlagValueStorageKind>(value_storage_kind_);
-  }
-  FlagDefaultKind DefaultKind() const
-      ABSL_EXCLUSIVE_LOCKS_REQUIRED(*DataGuard()) {
-    return static_cast<FlagDefaultKind>(def_kind_);
-  }
-
-  // CommandLineFlag interface implementation
-  absl::string_view Name() const override;
-  std::string Filename() const override;
-  std::string Help() const override;
-  FlagFastTypeId TypeId() const override;
-  bool IsSpecifiedOnCommandLine() const override
-      ABSL_LOCKS_EXCLUDED(*DataGuard());
-  std::string DefaultValue() const override ABSL_LOCKS_EXCLUDED(*DataGuard());
-  std::string CurrentValue() const override ABSL_LOCKS_EXCLUDED(*DataGuard());
-  bool ValidateInputValue(absl::string_view value) const override
-      ABSL_LOCKS_EXCLUDED(*DataGuard());
-  void CheckDefaultValueParsingRoundtrip() const override
-      ABSL_LOCKS_EXCLUDED(*DataGuard());
-
-  // Interfaces to save and restore flags to/from persistent state.
-  // Returns current flag state or nullptr if flag does not support
-  // saving and restoring a state.
-  std::unique_ptr<FlagStateInterface> SaveState() override
-      ABSL_LOCKS_EXCLUDED(*DataGuard());
-
-  // Restores the flag state to the supplied state object. If there is
-  // nothing to restore returns false. Otherwise returns true.
-  bool RestoreState(const FlagState& flag_state)
-      ABSL_LOCKS_EXCLUDED(*DataGuard());
-
-  bool ParseFrom(absl::string_view value, FlagSettingMode set_mode,
-                 ValueSource source, std::string& error) override
-      ABSL_LOCKS_EXCLUDED(*DataGuard());
-
-  // Immutable flag's state.
-
-  // Flags name passed to ABSL_FLAG as second arg.
-  const char* const name_;
-  // The file name where ABSL_FLAG resides.
-  const char* const filename_;
-  // Type-specific operations "vtable".
-  const FlagOpFn op_;
-  // Help message literal or function to generate it.
-  const FlagHelpMsg help_;
-  // Indicates if help message was supplied as literal or generator func.
-  const uint8_t help_source_kind_ : 1;
-  // Kind of storage this flag is using for the flag's value.
-  const uint8_t value_storage_kind_ : 2;
-
-  uint8_t : 0;  // The bytes containing the const bitfields must not be
-                // shared with bytes containing the mutable bitfields.
-
-  // Mutable flag's state (guarded by `data_guard_`).
-
-  // def_kind_ is not guard by DataGuard() since it is accessed in Init without
-  // locks.
-  uint8_t def_kind_ : 2;
-  // Has this flag's value been modified?
-  bool modified_ : 1 ABSL_GUARDED_BY(*DataGuard());
-  // Has this flag been specified on command line.
-  bool on_command_line_ : 1 ABSL_GUARDED_BY(*DataGuard());
-
-  // Unique tag for absl::call_once call to initialize this flag.
-  absl::once_flag init_control_;
-
-  // Mutation counter
-  int64_t counter_ ABSL_GUARDED_BY(*DataGuard());
-  // Optional flag's callback and absl::Mutex to guard the invocations.
-  FlagCallback* callback_ ABSL_GUARDED_BY(*DataGuard());
-  // Either a pointer to the function generating the default value based on the
-  // value specified in ABSL_FLAG or pointer to the dynamically set default
-  // value via SetCommandLineOptionWithMode. def_kind_ is used to distinguish
-  // these two cases.
-  FlagDefaultSrc default_value_;
-
-  // This is reserved space for an absl::Mutex to guard flag data. It will be
-  // initialized in FlagImpl::Init via placement new.
-  // We can't use "absl::Mutex data_guard_", since this class is not literal.
-  // We do not want to use "absl::Mutex* data_guard_", since this would require
-  // heap allocation during initialization, which is both slows program startup
-  // and can fail. Using reserved space + placement new allows us to avoid both
-  // problems.
-  alignas(absl::Mutex) mutable char data_guard_[sizeof(absl::Mutex)];
-};
-
-///////////////////////////////////////////////////////////////////////////////
-// The Flag object parameterized by the flag's value type. This class implements
-// flag reflection handle interface.
-
-template <typename T>
-class Flag {
- public:
-  constexpr Flag(const char* name, const char* filename, FlagHelpArg help,
-                 const FlagDefaultArg default_arg)
-      : impl_(name, filename, &FlagOps<T>, help,
-              flags_internal::StorageKind<T>(), default_arg),
-        value_() {}
-
-  // CommandLineFlag interface
-  absl::string_view Name() const { return impl_.Name(); }
-  std::string Filename() const { return impl_.Filename(); }
-  std::string Help() const { return impl_.Help(); }
-  // Do not use. To be removed.
-  bool IsSpecifiedOnCommandLine() const {
-    return impl_.IsSpecifiedOnCommandLine();
-  }
-  std::string DefaultValue() const { return impl_.DefaultValue(); }
-  std::string CurrentValue() const { return impl_.CurrentValue(); }
-
- private:
-  template <typename, bool>
-  friend class FlagRegistrar;
-  friend class FlagImplPeer;
-
-  T Get() const {
-    // See implementation notes in CommandLineFlag::Get().
-    union U {
-      T value;
-      U() {}
-      ~U() { value.~T(); }
-    };
-    U u;
-
-#if !defined(NDEBUG)
-    impl_.AssertValidType(base_internal::FastTypeId<T>(), &GenRuntimeTypeId<T>);
-#endif
-
-    if (!value_.Get(u.value)) impl_.Read(&u.value);
-    return std::move(u.value);
-  }
-  void Set(const T& v) {
-    impl_.AssertValidType(base_internal::FastTypeId<T>(), &GenRuntimeTypeId<T>);
-    impl_.Write(&v);
-  }
-
-  // Access to the reflection.
-  const CommandLineFlag& Reflect() const { return impl_; }
-
-  // Flag's data
-  // The implementation depends on value_ field to be placed exactly after the
-  // impl_ field, so that impl_ can figure out the offset to the value and
-  // access it.
-  FlagImpl impl_;
-  FlagValue<T> value_;
-};
-
-///////////////////////////////////////////////////////////////////////////////
-// Trampoline for friend access
-
-class FlagImplPeer {
- public:
-  template <typename T, typename FlagType>
-  static T InvokeGet(const FlagType& flag) {
-    return flag.Get();
-  }
-  template <typename FlagType, typename T>
-  static void InvokeSet(FlagType& flag, const T& v) {
-    flag.Set(v);
-  }
-  template <typename FlagType>
-  static const CommandLineFlag& InvokeReflect(const FlagType& f) {
-    return f.Reflect();
-  }
-};
-
-///////////////////////////////////////////////////////////////////////////////
-// Implementation of Flag value specific operations routine.
-template <typename T>
-void* FlagOps(FlagOp op, const void* v1, void* v2, void* v3) {
-  switch (op) {
-    case FlagOp::kAlloc: {
-      std::allocator<T> alloc;
-      return std::allocator_traits<std::allocator<T>>::allocate(alloc, 1);
-    }
-    case FlagOp::kDelete: {
-      T* p = static_cast<T*>(v2);
-      p->~T();
-      std::allocator<T> alloc;
-      std::allocator_traits<std::allocator<T>>::deallocate(alloc, p, 1);
-      return nullptr;
-    }
-    case FlagOp::kCopy:
-      *static_cast<T*>(v2) = *static_cast<const T*>(v1);
-      return nullptr;
-    case FlagOp::kCopyConstruct:
-      new (v2) T(*static_cast<const T*>(v1));
-      return nullptr;
-    case FlagOp::kSizeof:
-      return reinterpret_cast<void*>(static_cast<uintptr_t>(sizeof(T)));
-    case FlagOp::kFastTypeId:
-      return const_cast<void*>(base_internal::FastTypeId<T>());
-    case FlagOp::kRuntimeTypeId:
-      return const_cast<std::type_info*>(GenRuntimeTypeId<T>());
-    case FlagOp::kParse: {
-      // Initialize the temporary instance of type T based on current value in
-      // destination (which is going to be flag's default value).
-      T temp(*static_cast<T*>(v2));
-      if (!absl::ParseFlag<T>(*static_cast<const absl::string_view*>(v1), &temp,
-                              static_cast<std::string*>(v3))) {
-        return nullptr;
-      }
-      *static_cast<T*>(v2) = std::move(temp);
-      return v2;
-    }
-    case FlagOp::kUnparse:
-      *static_cast<std::string*>(v2) =
-          absl::UnparseFlag<T>(*static_cast<const T*>(v1));
-      return nullptr;
-    case FlagOp::kValueOffset: {
-      // Round sizeof(FlagImp) to a multiple of alignof(FlagValue<T>) to get the
-      // offset of the data.
-      ptrdiff_t round_to = alignof(FlagValue<T>);
-      ptrdiff_t offset =
-          (sizeof(FlagImpl) + round_to - 1) / round_to * round_to;
-      return reinterpret_cast<void*>(offset);
-    }
-  }
-  return nullptr;
-}
-
-///////////////////////////////////////////////////////////////////////////////
-// This class facilitates Flag object registration and tail expression-based
-// flag definition, for example:
-// ABSL_FLAG(int, foo, 42, "Foo help").OnUpdate(NotifyFooWatcher);
-struct FlagRegistrarEmpty {};
-template <typename T, bool do_register>
-class FlagRegistrar {
- public:
-  explicit FlagRegistrar(Flag<T>& flag) : flag_(flag) {
-    if (do_register) flags_internal::RegisterCommandLineFlag(flag_.impl_);
-  }
-
-  FlagRegistrar OnUpdate(FlagCallbackFunc cb) && {
-    flag_.impl_.SetCallback(cb);
-    return *this;
-  }
-
-  // Make the registrar "die" gracefully as an empty struct on a line where
-  // registration happens. Registrar objects are intended to live only as
-  // temporary.
-  operator FlagRegistrarEmpty() const { return {}; }  // NOLINT
-
- private:
-  Flag<T>& flag_;  // Flag being registered (not owned).
-};
-
-}  // namespace flags_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_FLAGS_INTERNAL_FLAG_H_
diff --git a/third_party/abseil_cpp/absl/flags/internal/parse.h b/third_party/abseil_cpp/absl/flags/internal/parse.h
deleted file mode 100644
index de706c898470..000000000000
--- a/third_party/abseil_cpp/absl/flags/internal/parse.h
+++ /dev/null
@@ -1,59 +0,0 @@
-//
-// Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_FLAGS_INTERNAL_PARSE_H_
-#define ABSL_FLAGS_INTERNAL_PARSE_H_
-
-#include <string>
-#include <vector>
-
-#include "absl/base/config.h"
-#include "absl/flags/declare.h"
-#include "absl/strings/string_view.h"
-
-ABSL_DECLARE_FLAG(std::vector<std::string>, flagfile);
-ABSL_DECLARE_FLAG(std::vector<std::string>, fromenv);
-ABSL_DECLARE_FLAG(std::vector<std::string>, tryfromenv);
-ABSL_DECLARE_FLAG(std::vector<std::string>, undefok);
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-
-enum class ArgvListAction { kRemoveParsedArgs, kKeepParsedArgs };
-enum class UsageFlagsAction { kHandleUsage, kIgnoreUsage };
-enum class OnUndefinedFlag {
-  kIgnoreUndefined,
-  kReportUndefined,
-  kAbortIfUndefined
-};
-
-std::vector<char*> ParseCommandLineImpl(int argc, char* argv[],
-                                        ArgvListAction arg_list_act,
-                                        UsageFlagsAction usage_flag_act,
-                                        OnUndefinedFlag on_undef_flag);
-
-// --------------------------------------------------------------------
-// Inspect original command line
-
-// Returns true if flag with specified name was either present on the original
-// command line or specified in flag file present on the original command line.
-bool WasPresentOnCommandLine(absl::string_view flag_name);
-
-}  // namespace flags_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_FLAGS_INTERNAL_PARSE_H_
diff --git a/third_party/abseil_cpp/absl/flags/internal/path_util.h b/third_party/abseil_cpp/absl/flags/internal/path_util.h
deleted file mode 100644
index a6594d3347e1..000000000000
--- a/third_party/abseil_cpp/absl/flags/internal/path_util.h
+++ /dev/null
@@ -1,62 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_FLAGS_INTERNAL_PATH_UTIL_H_
-#define ABSL_FLAGS_INTERNAL_PATH_UTIL_H_
-
-#include "absl/base/config.h"
-#include "absl/strings/string_view.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-
-// A portable interface that returns the basename of the filename passed as an
-// argument. It is similar to basename(3)
-// <https://linux.die.net/man/3/basename>.
-// For example:
-//     flags_internal::Basename("a/b/prog/file.cc")
-// returns "file.cc"
-//     flags_internal::Basename("file.cc")
-// returns "file.cc"
-inline absl::string_view Basename(absl::string_view filename) {
-  auto last_slash_pos = filename.find_last_of("/\\");
-
-  return last_slash_pos == absl::string_view::npos
-             ? filename
-             : filename.substr(last_slash_pos + 1);
-}
-
-// A portable interface that returns the directory name of the filename
-// passed as an argument, including the trailing slash.
-// Returns the empty string if a slash is not found in the input file name.
-// For example:
-//      flags_internal::Package("a/b/prog/file.cc")
-// returns "a/b/prog/"
-//      flags_internal::Package("file.cc")
-// returns ""
-inline absl::string_view Package(absl::string_view filename) {
-  auto last_slash_pos = filename.find_last_of("/\\");
-
-  return last_slash_pos == absl::string_view::npos
-             ? absl::string_view()
-             : filename.substr(0, last_slash_pos + 1);
-}
-
-}  // namespace flags_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_FLAGS_INTERNAL_PATH_UTIL_H_
diff --git a/third_party/abseil_cpp/absl/flags/internal/path_util_test.cc b/third_party/abseil_cpp/absl/flags/internal/path_util_test.cc
deleted file mode 100644
index 2091373c88ea..000000000000
--- a/third_party/abseil_cpp/absl/flags/internal/path_util_test.cc
+++ /dev/null
@@ -1,46 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/internal/path_util.h"
-
-#include "gtest/gtest.h"
-
-namespace {
-
-namespace flags = absl::flags_internal;
-
-TEST(FlagsPathUtilTest, TestBasename) {
-  EXPECT_EQ(flags::Basename(""), "");
-  EXPECT_EQ(flags::Basename("a.cc"), "a.cc");
-  EXPECT_EQ(flags::Basename("dir/a.cc"), "a.cc");
-  EXPECT_EQ(flags::Basename("dir1/dir2/a.cc"), "a.cc");
-  EXPECT_EQ(flags::Basename("../dir1/dir2/a.cc"), "a.cc");
-  EXPECT_EQ(flags::Basename("/dir1/dir2/a.cc"), "a.cc");
-  EXPECT_EQ(flags::Basename("/dir1/dir2/../dir3/a.cc"), "a.cc");
-}
-
-// --------------------------------------------------------------------
-
-TEST(FlagsPathUtilTest, TestPackage) {
-  EXPECT_EQ(flags::Package(""), "");
-  EXPECT_EQ(flags::Package("a.cc"), "");
-  EXPECT_EQ(flags::Package("dir/a.cc"), "dir/");
-  EXPECT_EQ(flags::Package("dir1/dir2/a.cc"), "dir1/dir2/");
-  EXPECT_EQ(flags::Package("../dir1/dir2/a.cc"), "../dir1/dir2/");
-  EXPECT_EQ(flags::Package("/dir1/dir2/a.cc"), "/dir1/dir2/");
-  EXPECT_EQ(flags::Package("/dir1/dir2/../dir3/a.cc"), "/dir1/dir2/../dir3/");
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/flags/internal/private_handle_accessor.cc b/third_party/abseil_cpp/absl/flags/internal/private_handle_accessor.cc
deleted file mode 100644
index a7eb58b6d45f..000000000000
--- a/third_party/abseil_cpp/absl/flags/internal/private_handle_accessor.cc
+++ /dev/null
@@ -1,65 +0,0 @@
-//
-// Copyright 2020 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/internal/private_handle_accessor.h"
-
-#include <memory>
-#include <string>
-
-#include "absl/base/config.h"
-#include "absl/flags/commandlineflag.h"
-#include "absl/flags/internal/commandlineflag.h"
-#include "absl/strings/string_view.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-
-FlagFastTypeId PrivateHandleAccessor::TypeId(const CommandLineFlag& flag) {
-  return flag.TypeId();
-}
-
-std::unique_ptr<FlagStateInterface> PrivateHandleAccessor::SaveState(
-    CommandLineFlag& flag) {
-  return flag.SaveState();
-}
-
-bool PrivateHandleAccessor::IsSpecifiedOnCommandLine(
-    const CommandLineFlag& flag) {
-  return flag.IsSpecifiedOnCommandLine();
-}
-
-bool PrivateHandleAccessor::ValidateInputValue(const CommandLineFlag& flag,
-                                               absl::string_view value) {
-  return flag.ValidateInputValue(value);
-}
-
-void PrivateHandleAccessor::CheckDefaultValueParsingRoundtrip(
-    const CommandLineFlag& flag) {
-  flag.CheckDefaultValueParsingRoundtrip();
-}
-
-bool PrivateHandleAccessor::ParseFrom(CommandLineFlag& flag,
-                                      absl::string_view value,
-                                      flags_internal::FlagSettingMode set_mode,
-                                      flags_internal::ValueSource source,
-                                      std::string& error) {
-  return flag.ParseFrom(value, set_mode, source, error);
-}
-
-}  // namespace flags_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
diff --git a/third_party/abseil_cpp/absl/flags/internal/private_handle_accessor.h b/third_party/abseil_cpp/absl/flags/internal/private_handle_accessor.h
deleted file mode 100644
index c64435cd6199..000000000000
--- a/third_party/abseil_cpp/absl/flags/internal/private_handle_accessor.h
+++ /dev/null
@@ -1,61 +0,0 @@
-//
-// Copyright 2020 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_FLAGS_INTERNAL_PRIVATE_HANDLE_ACCESSOR_H_
-#define ABSL_FLAGS_INTERNAL_PRIVATE_HANDLE_ACCESSOR_H_
-
-#include <memory>
-#include <string>
-
-#include "absl/base/config.h"
-#include "absl/flags/commandlineflag.h"
-#include "absl/flags/internal/commandlineflag.h"
-#include "absl/strings/string_view.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-
-// This class serves as a trampoline to access private methods of
-// CommandLineFlag. This class is intended for use exclusively internally inside
-// of the Abseil Flags implementation.
-class PrivateHandleAccessor {
- public:
-  // Access to CommandLineFlag::TypeId.
-  static FlagFastTypeId TypeId(const CommandLineFlag& flag);
-
-  // Access to CommandLineFlag::SaveState.
-  static std::unique_ptr<FlagStateInterface> SaveState(CommandLineFlag& flag);
-
-  // Access to CommandLineFlag::IsSpecifiedOnCommandLine.
-  static bool IsSpecifiedOnCommandLine(const CommandLineFlag& flag);
-
-  // Access to CommandLineFlag::ValidateInputValue.
-  static bool ValidateInputValue(const CommandLineFlag& flag,
-                                 absl::string_view value);
-
-  // Access to CommandLineFlag::CheckDefaultValueParsingRoundtrip.
-  static void CheckDefaultValueParsingRoundtrip(const CommandLineFlag& flag);
-
-  static bool ParseFrom(CommandLineFlag& flag, absl::string_view value,
-                        flags_internal::FlagSettingMode set_mode,
-                        flags_internal::ValueSource source, std::string& error);
-};
-
-}  // namespace flags_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_FLAGS_INTERNAL_PRIVATE_HANDLE_ACCESSOR_H_
diff --git a/third_party/abseil_cpp/absl/flags/internal/program_name.cc b/third_party/abseil_cpp/absl/flags/internal/program_name.cc
deleted file mode 100644
index 51d698da8b31..000000000000
--- a/third_party/abseil_cpp/absl/flags/internal/program_name.cc
+++ /dev/null
@@ -1,60 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/internal/program_name.h"
-
-#include <string>
-
-#include "absl/base/attributes.h"
-#include "absl/base/config.h"
-#include "absl/base/const_init.h"
-#include "absl/base/thread_annotations.h"
-#include "absl/flags/internal/path_util.h"
-#include "absl/strings/string_view.h"
-#include "absl/synchronization/mutex.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-
-ABSL_CONST_INIT static absl::Mutex program_name_guard(absl::kConstInit);
-ABSL_CONST_INIT static std::string* program_name
-    ABSL_GUARDED_BY(program_name_guard) = nullptr;
-
-std::string ProgramInvocationName() {
-  absl::MutexLock l(&program_name_guard);
-
-  return program_name ? *program_name : "UNKNOWN";
-}
-
-std::string ShortProgramInvocationName() {
-  absl::MutexLock l(&program_name_guard);
-
-  return program_name ? std::string(flags_internal::Basename(*program_name))
-                      : "UNKNOWN";
-}
-
-void SetProgramInvocationName(absl::string_view prog_name_str) {
-  absl::MutexLock l(&program_name_guard);
-
-  if (!program_name)
-    program_name = new std::string(prog_name_str);
-  else
-    program_name->assign(prog_name_str.data(), prog_name_str.size());
-}
-
-}  // namespace flags_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/flags/internal/program_name.h b/third_party/abseil_cpp/absl/flags/internal/program_name.h
deleted file mode 100644
index b99b94fe18ab..000000000000
--- a/third_party/abseil_cpp/absl/flags/internal/program_name.h
+++ /dev/null
@@ -1,50 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_FLAGS_INTERNAL_PROGRAM_NAME_H_
-#define ABSL_FLAGS_INTERNAL_PROGRAM_NAME_H_
-
-#include <string>
-
-#include "absl/base/config.h"
-#include "absl/strings/string_view.h"
-
-// --------------------------------------------------------------------
-// Program name
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-
-// Returns program invocation name or "UNKNOWN" if `SetProgramInvocationName()`
-// is never called. At the moment this is always set to argv[0] as part of
-// library initialization.
-std::string ProgramInvocationName();
-
-// Returns base name for program invocation name. For example, if
-//   ProgramInvocationName() == "a/b/mybinary"
-// then
-//   ShortProgramInvocationName() == "mybinary"
-std::string ShortProgramInvocationName();
-
-// Sets program invocation name to a new value. Should only be called once
-// during program initialization, before any threads are spawned.
-void SetProgramInvocationName(absl::string_view prog_name_str);
-
-}  // namespace flags_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_FLAGS_INTERNAL_PROGRAM_NAME_H_
diff --git a/third_party/abseil_cpp/absl/flags/internal/program_name_test.cc b/third_party/abseil_cpp/absl/flags/internal/program_name_test.cc
deleted file mode 100644
index aff9f6315e4e..000000000000
--- a/third_party/abseil_cpp/absl/flags/internal/program_name_test.cc
+++ /dev/null
@@ -1,61 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/internal/program_name.h"
-
-#include <string>
-
-#include "gtest/gtest.h"
-#include "absl/strings/match.h"
-#include "absl/strings/string_view.h"
-
-namespace {
-
-namespace flags = absl::flags_internal;
-
-TEST(FlagsPathUtilTest, TestProgamNameInterfaces) {
-  flags::SetProgramInvocationName("absl/flags/program_name_test");
-  std::string program_name = flags::ProgramInvocationName();
-  for (char& c : program_name)
-    if (c == '\\') c = '/';
-
-#if !defined(__wasm__) && !defined(__asmjs__)
-  const std::string expect_name = "absl/flags/program_name_test";
-  const std::string expect_basename = "program_name_test";
-#else
-  // For targets that generate javascript or webassembly the invocation name
-  // has the special value below.
-  const std::string expect_name = "this.program";
-  const std::string expect_basename = "this.program";
-#endif
-
-  EXPECT_TRUE(absl::EndsWith(program_name, expect_name)) << program_name;
-  EXPECT_EQ(flags::ShortProgramInvocationName(), expect_basename);
-
-  flags::SetProgramInvocationName("a/my_test");
-
-  EXPECT_EQ(flags::ProgramInvocationName(), "a/my_test");
-  EXPECT_EQ(flags::ShortProgramInvocationName(), "my_test");
-
-  absl::string_view not_null_terminated("absl/aaa/bbb");
-  not_null_terminated = not_null_terminated.substr(1, 10);
-
-  flags::SetProgramInvocationName(not_null_terminated);
-
-  EXPECT_EQ(flags::ProgramInvocationName(), "bsl/aaa/bb");
-  EXPECT_EQ(flags::ShortProgramInvocationName(), "bb");
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/flags/internal/registry.h b/third_party/abseil_cpp/absl/flags/internal/registry.h
deleted file mode 100644
index a8d9eb9cb0bb..000000000000
--- a/third_party/abseil_cpp/absl/flags/internal/registry.h
+++ /dev/null
@@ -1,97 +0,0 @@
-//
-// Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_FLAGS_INTERNAL_REGISTRY_H_
-#define ABSL_FLAGS_INTERNAL_REGISTRY_H_
-
-#include <functional>
-
-#include "absl/base/config.h"
-#include "absl/flags/commandlineflag.h"
-#include "absl/flags/internal/commandlineflag.h"
-#include "absl/strings/string_view.h"
-
-// --------------------------------------------------------------------
-// Global flags registry API.
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-
-// Executes specified visitor for each non-retired flag in the registry. While
-// callback are executed, the registry is locked and can't be changed.
-void ForEachFlag(std::function<void(CommandLineFlag&)> visitor);
-
-//-----------------------------------------------------------------------------
-
-bool RegisterCommandLineFlag(CommandLineFlag&);
-
-void FinalizeRegistry();
-
-//-----------------------------------------------------------------------------
-// Retired registrations:
-//
-// Retired flag registrations are treated specially. A 'retired' flag is
-// provided only for compatibility with automated invocations that still
-// name it.  A 'retired' flag:
-//   - is not bound to a C++ FLAGS_ reference.
-//   - has a type and a value, but that value is intentionally inaccessible.
-//   - does not appear in --help messages.
-//   - is fully supported by _all_ flag parsing routines.
-//   - consumes args normally, and complains about type mismatches in its
-//     argument.
-//   - emits a complaint but does not die (e.g. LOG(ERROR)) if it is
-//     accessed by name through the flags API for parsing or otherwise.
-//
-// The registrations for a flag happen in an unspecified order as the
-// initializers for the namespace-scope objects of a program are run.
-// Any number of weak registrations for a flag can weakly define the flag.
-// One non-weak registration will upgrade the flag from weak to non-weak.
-// Further weak registrations of a non-weak flag are ignored.
-//
-// This mechanism is designed to support moving dead flags into a
-// 'graveyard' library.  An example migration:
-//
-//   0: Remove references to this FLAGS_flagname in the C++ codebase.
-//   1: Register as 'retired' in old_lib.
-//   2: Make old_lib depend on graveyard.
-//   3: Add a redundant 'retired' registration to graveyard.
-//   4: Remove the old_lib 'retired' registration.
-//   5: Eventually delete the graveyard registration entirely.
-//
-
-// Retire flag with name "name" and type indicated by ops.
-void Retire(const char* name, FlagFastTypeId type_id, char* buf);
-
-constexpr size_t kRetiredFlagObjSize = 3 * sizeof(void*);
-constexpr size_t kRetiredFlagObjAlignment = alignof(void*);
-
-// Registered a retired flag with name 'flag_name' and type 'T'.
-template <typename T>
-class RetiredFlag {
- public:
-  void Retire(const char* flag_name) {
-    flags_internal::Retire(flag_name, base_internal::FastTypeId<T>(), buf_);
-  }
-
- private:
-  alignas(kRetiredFlagObjAlignment) char buf_[kRetiredFlagObjSize];
-};
-
-}  // namespace flags_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_FLAGS_INTERNAL_REGISTRY_H_
diff --git a/third_party/abseil_cpp/absl/flags/internal/usage.cc b/third_party/abseil_cpp/absl/flags/internal/usage.cc
deleted file mode 100644
index f29d7c9b48f0..000000000000
--- a/third_party/abseil_cpp/absl/flags/internal/usage.cc
+++ /dev/null
@@ -1,524 +0,0 @@
-//
-// Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/internal/usage.h"
-
-#include <stdint.h>
-
-#include <functional>
-#include <map>
-#include <ostream>
-#include <string>
-#include <utility>
-#include <vector>
-
-#include "absl/base/config.h"
-#include "absl/flags/commandlineflag.h"
-#include "absl/flags/flag.h"
-#include "absl/flags/internal/flag.h"
-#include "absl/flags/internal/path_util.h"
-#include "absl/flags/internal/private_handle_accessor.h"
-#include "absl/flags/internal/program_name.h"
-#include "absl/flags/internal/registry.h"
-#include "absl/flags/usage_config.h"
-#include "absl/strings/str_cat.h"
-#include "absl/strings/str_split.h"
-#include "absl/strings/string_view.h"
-
-// Dummy global variables to prevent anyone else defining these.
-bool FLAGS_help = false;
-bool FLAGS_helpfull = false;
-bool FLAGS_helpshort = false;
-bool FLAGS_helppackage = false;
-bool FLAGS_version = false;
-bool FLAGS_only_check_args = false;
-bool FLAGS_helpon = false;
-bool FLAGS_helpmatch = false;
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-namespace {
-
-using PerFlagFilter = std::function<bool(const absl::CommandLineFlag&)>;
-
-// Maximum length size in a human readable format.
-constexpr size_t kHrfMaxLineLength = 80;
-
-// This class is used to emit an XML element with `tag` and `text`.
-// It adds opening and closing tags and escapes special characters in the text.
-// For example:
-// std::cout << XMLElement("title", "Milk & Cookies");
-// prints "<title>Milk &amp; Cookies</title>"
-class XMLElement {
- public:
-  XMLElement(absl::string_view tag, absl::string_view txt)
-      : tag_(tag), txt_(txt) {}
-
-  friend std::ostream& operator<<(std::ostream& out,
-                                  const XMLElement& xml_elem) {
-    out << "<" << xml_elem.tag_ << ">";
-
-    for (auto c : xml_elem.txt_) {
-      switch (c) {
-        case '"':
-          out << "&quot;";
-          break;
-        case '\'':
-          out << "&apos;";
-          break;
-        case '&':
-          out << "&amp;";
-          break;
-        case '<':
-          out << "&lt;";
-          break;
-        case '>':
-          out << "&gt;";
-          break;
-        default:
-          out << c;
-          break;
-      }
-    }
-
-    return out << "</" << xml_elem.tag_ << ">";
-  }
-
- private:
-  absl::string_view tag_;
-  absl::string_view txt_;
-};
-
-// --------------------------------------------------------------------
-// Helper class to pretty-print info about a flag.
-
-class FlagHelpPrettyPrinter {
- public:
-  // Pretty printer holds on to the std::ostream& reference to direct an output
-  // to that stream.
-  FlagHelpPrettyPrinter(size_t max_line_len, size_t min_line_len,
-                        size_t wrapped_line_indent, std::ostream& out)
-      : out_(out),
-        max_line_len_(max_line_len),
-        min_line_len_(min_line_len),
-        wrapped_line_indent_(wrapped_line_indent),
-        line_len_(0),
-        first_line_(true) {}
-
-  void Write(absl::string_view str, bool wrap_line = false) {
-    // Empty string - do nothing.
-    if (str.empty()) return;
-
-    std::vector<absl::string_view> tokens;
-    if (wrap_line) {
-      for (auto line : absl::StrSplit(str, absl::ByAnyChar("\n\r"))) {
-        if (!tokens.empty()) {
-          // Keep line separators in the input string.
-          tokens.push_back("\n");
-        }
-        for (auto token :
-             absl::StrSplit(line, absl::ByAnyChar(" \t"), absl::SkipEmpty())) {
-          tokens.push_back(token);
-        }
-      }
-    } else {
-      tokens.push_back(str);
-    }
-
-    for (auto token : tokens) {
-      bool new_line = (line_len_ == 0);
-
-      // Respect line separators in the input string.
-      if (token == "\n") {
-        EndLine();
-        continue;
-      }
-
-      // Write the token, ending the string first if necessary/possible.
-      if (!new_line &&
-          (line_len_ + static_cast<int>(token.size()) >= max_line_len_)) {
-        EndLine();
-        new_line = true;
-      }
-
-      if (new_line) {
-        StartLine();
-      } else {
-        out_ << ' ';
-        ++line_len_;
-      }
-
-      out_ << token;
-      line_len_ += token.size();
-    }
-  }
-
-  void StartLine() {
-    if (first_line_) {
-      line_len_ = min_line_len_;
-      first_line_ = false;
-    } else {
-      line_len_ = min_line_len_ + wrapped_line_indent_;
-    }
-    out_ << std::string(line_len_, ' ');
-  }
-  void EndLine() {
-    out_ << '\n';
-    line_len_ = 0;
-  }
-
- private:
-  std::ostream& out_;
-  const size_t max_line_len_;
-  const size_t min_line_len_;
-  const size_t wrapped_line_indent_;
-  size_t line_len_;
-  bool first_line_;
-};
-
-void FlagHelpHumanReadable(const CommandLineFlag& flag, std::ostream& out) {
-  FlagHelpPrettyPrinter printer(kHrfMaxLineLength, 4, 2, out);
-
-  // Flag name.
-  printer.Write(absl::StrCat("--", flag.Name()));
-
-  // Flag help.
-  printer.Write(absl::StrCat("(", flag.Help(), ");"), /*wrap_line=*/true);
-
-  // The listed default value will be the actual default from the flag
-  // definition in the originating source file, unless the value has
-  // subsequently been modified using SetCommandLineOption() with mode
-  // SET_FLAGS_DEFAULT.
-  std::string dflt_val = flag.DefaultValue();
-  std::string curr_val = flag.CurrentValue();
-  bool is_modified = curr_val != dflt_val;
-
-  if (flag.IsOfType<std::string>()) {
-    dflt_val = absl::StrCat("\"", dflt_val, "\"");
-  }
-  printer.Write(absl::StrCat("default: ", dflt_val, ";"));
-
-  if (is_modified) {
-    if (flag.IsOfType<std::string>()) {
-      curr_val = absl::StrCat("\"", curr_val, "\"");
-    }
-    printer.Write(absl::StrCat("currently: ", curr_val, ";"));
-  }
-
-  printer.EndLine();
-}
-
-// Shows help for every filename which matches any of the filters
-// If filters are empty, shows help for every file.
-// If a flag's help message has been stripped (e.g. by adding '#define
-// STRIP_FLAG_HELP 1' then this flag will not be displayed by '--help'
-// and its variants.
-void FlagsHelpImpl(std::ostream& out, PerFlagFilter filter_cb,
-                   HelpFormat format, absl::string_view program_usage_message) {
-  if (format == HelpFormat::kHumanReadable) {
-    out << flags_internal::ShortProgramInvocationName() << ": "
-        << program_usage_message << "\n\n";
-  } else {
-    // XML schema is not a part of our public API for now.
-    out << "<?xml version=\"1.0\"?>\n"
-        << "<!-- This output should be used with care. We do not report type "
-           "names for flags with user defined types -->\n"
-        << "<!-- Prefer flag only_check_args for validating flag inputs -->\n"
-        // The document.
-        << "<AllFlags>\n"
-        // The program name and usage.
-        << XMLElement("program", flags_internal::ShortProgramInvocationName())
-        << '\n'
-        << XMLElement("usage", program_usage_message) << '\n';
-  }
-
-  // Map of package name to
-  //   map of file name to
-  //     vector of flags in the file.
-  // This map is used to output matching flags grouped by package and file
-  // name.
-  std::map<std::string,
-           std::map<std::string, std::vector<const absl::CommandLineFlag*>>>
-      matching_flags;
-
-  flags_internal::ForEachFlag([&](absl::CommandLineFlag& flag) {
-    // Ignore retired flags.
-    if (flag.IsRetired()) return;
-
-    // If the flag has been stripped, pretend that it doesn't exist.
-    if (flag.Help() == flags_internal::kStrippedFlagHelp) return;
-
-    // Make sure flag satisfies the filter
-    if (!filter_cb(flag)) return;
-
-    std::string flag_filename = flag.Filename();
-
-    matching_flags[std::string(flags_internal::Package(flag_filename))]
-                  [flag_filename]
-                      .push_back(&flag);
-  });
-
-  absl::string_view package_separator;  // controls blank lines between packages
-  absl::string_view file_separator;     // controls blank lines between files
-  for (const auto& package : matching_flags) {
-    if (format == HelpFormat::kHumanReadable) {
-      out << package_separator;
-      package_separator = "\n\n";
-    }
-
-    file_separator = "";
-    for (const auto& flags_in_file : package.second) {
-      if (format == HelpFormat::kHumanReadable) {
-        out << file_separator << "  Flags from " << flags_in_file.first
-            << ":\n";
-        file_separator = "\n";
-      }
-
-      for (const auto* flag : flags_in_file.second) {
-        flags_internal::FlagHelp(out, *flag, format);
-      }
-    }
-  }
-
-  if (format == HelpFormat::kHumanReadable) {
-    FlagHelpPrettyPrinter printer(kHrfMaxLineLength, 0, 0, out);
-
-    if (filter_cb && matching_flags.empty()) {
-      printer.Write("No flags matched.\n", true);
-    }
-    printer.EndLine();
-    printer.Write(
-        "Try --helpfull to get a list of all flags or --help=substring "
-        "shows help for flags which include specified substring in either "
-        "in the name, or description or path.\n",
-        true);
-  } else {
-    // The end of the document.
-    out << "</AllFlags>\n";
-  }
-}
-
-void FlagsHelpImpl(std::ostream& out,
-                   flags_internal::FlagKindFilter filename_filter_cb,
-                   HelpFormat format, absl::string_view program_usage_message) {
-  FlagsHelpImpl(
-      out,
-      [&](const absl::CommandLineFlag& flag) {
-        return filename_filter_cb && filename_filter_cb(flag.Filename());
-      },
-      format, program_usage_message);
-}
-
-}  // namespace
-
-// --------------------------------------------------------------------
-// Produces the help message describing specific flag.
-void FlagHelp(std::ostream& out, const CommandLineFlag& flag,
-              HelpFormat format) {
-  if (format == HelpFormat::kHumanReadable)
-    flags_internal::FlagHelpHumanReadable(flag, out);
-}
-
-// --------------------------------------------------------------------
-// Produces the help messages for all flags matching the filename filter.
-// If filter is empty produces help messages for all flags.
-void FlagsHelp(std::ostream& out, absl::string_view filter, HelpFormat format,
-               absl::string_view program_usage_message) {
-  flags_internal::FlagKindFilter filter_cb = [&](absl::string_view filename) {
-    return filter.empty() || filename.find(filter) != absl::string_view::npos;
-  };
-  flags_internal::FlagsHelpImpl(out, filter_cb, format, program_usage_message);
-}
-
-// --------------------------------------------------------------------
-// Checks all the 'usage' command line flags to see if any have been set.
-// If so, handles them appropriately.
-int HandleUsageFlags(std::ostream& out,
-                     absl::string_view program_usage_message) {
-  switch (GetFlagsHelpMode()) {
-    case HelpMode::kNone:
-      break;
-    case HelpMode::kImportant:
-      flags_internal::FlagsHelpImpl(
-          out, flags_internal::GetUsageConfig().contains_help_flags,
-          GetFlagsHelpFormat(), program_usage_message);
-      return 1;
-
-    case HelpMode::kShort:
-      flags_internal::FlagsHelpImpl(
-          out, flags_internal::GetUsageConfig().contains_helpshort_flags,
-          GetFlagsHelpFormat(), program_usage_message);
-      return 1;
-
-    case HelpMode::kFull:
-      flags_internal::FlagsHelp(out, "", GetFlagsHelpFormat(),
-                                program_usage_message);
-      return 1;
-
-    case HelpMode::kPackage:
-      flags_internal::FlagsHelpImpl(
-          out, flags_internal::GetUsageConfig().contains_helppackage_flags,
-          GetFlagsHelpFormat(), program_usage_message);
-
-      return 1;
-
-    case HelpMode::kMatch: {
-      std::string substr = GetFlagsHelpMatchSubstr();
-      if (substr.empty()) {
-        // show all options
-        flags_internal::FlagsHelp(out, substr, GetFlagsHelpFormat(),
-                                  program_usage_message);
-      } else {
-        auto filter_cb = [&substr](const absl::CommandLineFlag& flag) {
-          if (absl::StrContains(flag.Name(), substr)) return true;
-          if (absl::StrContains(flag.Filename(), substr)) return true;
-          if (absl::StrContains(flag.Help(), substr)) return true;
-
-          return false;
-        };
-        flags_internal::FlagsHelpImpl(
-            out, filter_cb, HelpFormat::kHumanReadable, program_usage_message);
-      }
-
-      return 1;
-    }
-    case HelpMode::kVersion:
-      if (flags_internal::GetUsageConfig().version_string)
-        out << flags_internal::GetUsageConfig().version_string();
-      // Unlike help, we may be asking for version in a script, so return 0
-      return 0;
-
-    case HelpMode::kOnlyCheckArgs:
-      return 0;
-  }
-
-  return -1;
-}
-
-// --------------------------------------------------------------------
-// Globals representing usage reporting flags
-
-namespace {
-
-ABSL_CONST_INIT absl::Mutex help_attributes_guard(absl::kConstInit);
-ABSL_CONST_INIT std::string* match_substr
-    ABSL_GUARDED_BY(help_attributes_guard) = nullptr;
-ABSL_CONST_INIT HelpMode help_mode ABSL_GUARDED_BY(help_attributes_guard) =
-    HelpMode::kNone;
-ABSL_CONST_INIT HelpFormat help_format ABSL_GUARDED_BY(help_attributes_guard) =
-    HelpFormat::kHumanReadable;
-
-}  // namespace
-
-std::string GetFlagsHelpMatchSubstr() {
-  absl::MutexLock l(&help_attributes_guard);
-  if (match_substr == nullptr) return "";
-  return *match_substr;
-}
-
-void SetFlagsHelpMatchSubstr(absl::string_view substr) {
-  absl::MutexLock l(&help_attributes_guard);
-  if (match_substr == nullptr) match_substr = new std::string;
-  match_substr->assign(substr.data(), substr.size());
-}
-
-HelpMode GetFlagsHelpMode() {
-  absl::MutexLock l(&help_attributes_guard);
-  // Refer to dummy variales to prevent linker dropping them
-  if (FLAGS_help || FLAGS_helpfull || FLAGS_helpshort || FLAGS_helppackage ||
-      FLAGS_version || FLAGS_only_check_args || FLAGS_helpon ||
-      FLAGS_helpmatch) {
-    help_mode = HelpMode::kNone;
-  }
-  return help_mode;
-}
-
-void SetFlagsHelpMode(HelpMode mode) {
-  absl::MutexLock l(&help_attributes_guard);
-  help_mode = mode;
-}
-
-HelpFormat GetFlagsHelpFormat() {
-  absl::MutexLock l(&help_attributes_guard);
-  return help_format;
-}
-
-void SetFlagsHelpFormat(HelpFormat format) {
-  absl::MutexLock l(&help_attributes_guard);
-  help_format = format;
-}
-
-// Deduces usage flags from the input argument in a form --name=value or
-// --name. argument is already split into name and value before we call this
-// function.
-bool DeduceUsageFlags(absl::string_view name, absl::string_view value) {
-  if (absl::ConsumePrefix(&name, "help")) {
-    if (name == "") {
-      if (value.empty()) {
-        SetFlagsHelpMode(HelpMode::kImportant);
-      } else {
-        SetFlagsHelpMode(HelpMode::kMatch);
-        SetFlagsHelpMatchSubstr(value);
-      }
-      return true;
-    }
-
-    if (name == "match") {
-      SetFlagsHelpMode(HelpMode::kMatch);
-      SetFlagsHelpMatchSubstr(value);
-      return true;
-    }
-
-    if (name == "on") {
-      SetFlagsHelpMode(HelpMode::kMatch);
-      SetFlagsHelpMatchSubstr(absl::StrCat("/", value, "."));
-      return true;
-    }
-
-    if (name == "full") {
-      SetFlagsHelpMode(HelpMode::kFull);
-      return true;
-    }
-
-    if (name == "short") {
-      SetFlagsHelpMode(HelpMode::kShort);
-      return true;
-    }
-
-    if (name == "package") {
-      SetFlagsHelpMode(HelpMode::kPackage);
-      return true;
-    }
-
-    return false;
-  }
-
-  if (name == "version") {
-    SetFlagsHelpMode(HelpMode::kVersion);
-    return true;
-  }
-
-  if (name == "only_check_args") {
-    SetFlagsHelpMode(HelpMode::kOnlyCheckArgs);
-    return true;
-  }
-
-  return false;
-}
-
-}  // namespace flags_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/flags/internal/usage.h b/third_party/abseil_cpp/absl/flags/internal/usage.h
deleted file mode 100644
index c0bcac57628a..000000000000
--- a/third_party/abseil_cpp/absl/flags/internal/usage.h
+++ /dev/null
@@ -1,104 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_FLAGS_INTERNAL_USAGE_H_
-#define ABSL_FLAGS_INTERNAL_USAGE_H_
-
-#include <iosfwd>
-#include <string>
-
-#include "absl/base/config.h"
-#include "absl/flags/commandlineflag.h"
-#include "absl/flags/declare.h"
-#include "absl/strings/string_view.h"
-
-// --------------------------------------------------------------------
-// Usage reporting interfaces
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-
-// The format to report the help messages in.
-enum class HelpFormat {
-  kHumanReadable,
-};
-
-// Streams the help message describing `flag` to `out`.
-// The default value for `flag` is included in the output.
-void FlagHelp(std::ostream& out, const CommandLineFlag& flag,
-              HelpFormat format = HelpFormat::kHumanReadable);
-
-// Produces the help messages for all flags matching the filter. A flag matches
-// the filter if it is defined in a file with a filename which includes
-// filter string as a substring. You can use '/' and '.' to restrict the
-// matching to a specific file names. For example:
-//   FlagsHelp(out, "/path/to/file.");
-// restricts help to only flags which resides in files named like:
-//  .../path/to/file.<ext>
-// for any extension 'ext'. If the filter is empty this function produces help
-// messages for all flags.
-void FlagsHelp(std::ostream& out, absl::string_view filter,
-               HelpFormat format, absl::string_view program_usage_message);
-
-// --------------------------------------------------------------------
-
-// If any of the 'usage' related command line flags (listed on the bottom of
-// this file) has been set this routine produces corresponding help message in
-// the specified output stream and returns:
-//  0 - if "version" or "only_check_flags" flags were set and handled.
-//  1 - if some other 'usage' related flag was set and handled.
-// -1 - if no usage flags were set on a commmand line.
-// Non negative return values are expected to be used as an exit code for a
-// binary.
-int HandleUsageFlags(std::ostream& out,
-                     absl::string_view program_usage_message);
-
-// --------------------------------------------------------------------
-// Globals representing usage reporting flags
-
-enum class HelpMode {
-  kNone,
-  kImportant,
-  kShort,
-  kFull,
-  kPackage,
-  kMatch,
-  kVersion,
-  kOnlyCheckArgs
-};
-
-// Returns substring to filter help output (--help=substr argument)
-std::string GetFlagsHelpMatchSubstr();
-// Returns the requested help mode.
-HelpMode GetFlagsHelpMode();
-// Returns the requested help format.
-HelpFormat GetFlagsHelpFormat();
-
-// These are corresponding setters to the attributes above.
-void SetFlagsHelpMatchSubstr(absl::string_view);
-void SetFlagsHelpMode(HelpMode);
-void SetFlagsHelpFormat(HelpFormat);
-
-// Deduces usage flags from the input argument in a form --name=value or
-// --name. argument is already split into name and value before we call this
-// function.
-bool DeduceUsageFlags(absl::string_view name, absl::string_view value);
-
-}  // namespace flags_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_FLAGS_INTERNAL_USAGE_H_
diff --git a/third_party/abseil_cpp/absl/flags/internal/usage_test.cc b/third_party/abseil_cpp/absl/flags/internal/usage_test.cc
deleted file mode 100644
index b5c2487da577..000000000000
--- a/third_party/abseil_cpp/absl/flags/internal/usage_test.cc
+++ /dev/null
@@ -1,493 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/internal/usage.h"
-
-#include <stdint.h>
-
-#include <sstream>
-#include <string>
-
-#include "gtest/gtest.h"
-#include "absl/flags/flag.h"
-#include "absl/flags/internal/parse.h"
-#include "absl/flags/internal/path_util.h"
-#include "absl/flags/internal/program_name.h"
-#include "absl/flags/reflection.h"
-#include "absl/flags/usage.h"
-#include "absl/flags/usage_config.h"
-#include "absl/strings/match.h"
-#include "absl/strings/string_view.h"
-
-ABSL_FLAG(int, usage_reporting_test_flag_01, 101,
-          "usage_reporting_test_flag_01 help message");
-ABSL_FLAG(bool, usage_reporting_test_flag_02, false,
-          "usage_reporting_test_flag_02 help message");
-ABSL_FLAG(double, usage_reporting_test_flag_03, 1.03,
-          "usage_reporting_test_flag_03 help message");
-ABSL_FLAG(int64_t, usage_reporting_test_flag_04, 1000000000000004L,
-          "usage_reporting_test_flag_04 help message");
-
-static const char kTestUsageMessage[] = "Custom usage message";
-
-struct UDT {
-  UDT() = default;
-  UDT(const UDT&) = default;
-};
-bool AbslParseFlag(absl::string_view, UDT*, std::string*) { return true; }
-std::string AbslUnparseFlag(const UDT&) { return "UDT{}"; }
-
-ABSL_FLAG(UDT, usage_reporting_test_flag_05, {},
-          "usage_reporting_test_flag_05 help message");
-
-ABSL_FLAG(
-    std::string, usage_reporting_test_flag_06, {},
-    "usage_reporting_test_flag_06 help message.\n"
-    "\n"
-    "Some more help.\n"
-    "Even more long long long long long long long long long long long long "
-    "help message.");
-
-namespace {
-
-namespace flags = absl::flags_internal;
-
-static std::string NormalizeFileName(absl::string_view fname) {
-#ifdef _WIN32
-  std::string normalized(fname);
-  std::replace(normalized.begin(), normalized.end(), '\\', '/');
-  fname = normalized;
-#endif
-
-  auto absl_pos = fname.rfind("absl/");
-  if (absl_pos != absl::string_view::npos) {
-    fname = fname.substr(absl_pos);
-  }
-  return std::string(fname);
-}
-
-class UsageReportingTest : public testing::Test {
- protected:
-  UsageReportingTest() {
-    // Install default config for the use on this unit test.
-    // Binary may install a custom config before tests are run.
-    absl::FlagsUsageConfig default_config;
-    default_config.normalize_filename = &NormalizeFileName;
-    absl::SetFlagsUsageConfig(default_config);
-  }
-  ~UsageReportingTest() override {
-    flags::SetFlagsHelpMode(flags::HelpMode::kNone);
-    flags::SetFlagsHelpMatchSubstr("");
-    flags::SetFlagsHelpFormat(flags::HelpFormat::kHumanReadable);
-  }
-
- private:
-  absl::FlagSaver flag_saver_;
-};
-
-// --------------------------------------------------------------------
-
-using UsageReportingDeathTest = UsageReportingTest;
-
-TEST_F(UsageReportingDeathTest, TestSetProgramUsageMessage) {
-  EXPECT_EQ(absl::ProgramUsageMessage(), kTestUsageMessage);
-
-#ifndef _WIN32
-  // TODO(rogeeff): figure out why this does not work on Windows.
-  EXPECT_DEATH_IF_SUPPORTED(
-      absl::SetProgramUsageMessage("custom usage message"),
-      ".*SetProgramUsageMessage\\(\\) called twice.*");
-#endif
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_01) {
-  const auto* flag = absl::FindCommandLineFlag("usage_reporting_test_flag_01");
-  std::stringstream test_buf;
-
-  flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
-  EXPECT_EQ(
-      test_buf.str(),
-      R"(    --usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
-      default: 101;
-)");
-}
-
-TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_02) {
-  const auto* flag = absl::FindCommandLineFlag("usage_reporting_test_flag_02");
-  std::stringstream test_buf;
-
-  flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
-  EXPECT_EQ(
-      test_buf.str(),
-      R"(    --usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
-      default: false;
-)");
-}
-
-TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_03) {
-  const auto* flag = absl::FindCommandLineFlag("usage_reporting_test_flag_03");
-  std::stringstream test_buf;
-
-  flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
-  EXPECT_EQ(
-      test_buf.str(),
-      R"(    --usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
-      default: 1.03;
-)");
-}
-
-TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_04) {
-  const auto* flag = absl::FindCommandLineFlag("usage_reporting_test_flag_04");
-  std::stringstream test_buf;
-
-  flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
-  EXPECT_EQ(
-      test_buf.str(),
-      R"(    --usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
-      default: 1000000000000004;
-)");
-}
-
-TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_05) {
-  const auto* flag = absl::FindCommandLineFlag("usage_reporting_test_flag_05");
-  std::stringstream test_buf;
-
-  flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
-  EXPECT_EQ(
-      test_buf.str(),
-      R"(    --usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
-      default: UDT{};
-)");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(UsageReportingTest, TestFlagsHelpHRF) {
-  std::string usage_test_flags_out =
-      R"(usage_test: Custom usage message
-
-  Flags from absl/flags/internal/usage_test.cc:
-    --usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
-      default: 101;
-    --usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
-      default: false;
-    --usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
-      default: 1.03;
-    --usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
-      default: 1000000000000004;
-    --usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
-      default: UDT{};
-    --usage_reporting_test_flag_06 (usage_reporting_test_flag_06 help message.
-
-      Some more help.
-      Even more long long long long long long long long long long long long help
-      message.); default: "";
-
-Try --helpfull to get a list of all flags or --help=substring shows help for
-flags which include specified substring in either in the name, or description or
-path.
-)";
-
-  std::stringstream test_buf_01;
-  flags::FlagsHelp(test_buf_01, "usage_test.cc",
-                   flags::HelpFormat::kHumanReadable, kTestUsageMessage);
-  EXPECT_EQ(test_buf_01.str(), usage_test_flags_out);
-
-  std::stringstream test_buf_02;
-  flags::FlagsHelp(test_buf_02, "flags/internal/usage_test.cc",
-                   flags::HelpFormat::kHumanReadable, kTestUsageMessage);
-  EXPECT_EQ(test_buf_02.str(), usage_test_flags_out);
-
-  std::stringstream test_buf_03;
-  flags::FlagsHelp(test_buf_03, "usage_test", flags::HelpFormat::kHumanReadable,
-                   kTestUsageMessage);
-  EXPECT_EQ(test_buf_03.str(), usage_test_flags_out);
-
-  std::stringstream test_buf_04;
-  flags::FlagsHelp(test_buf_04, "flags/invalid_file_name.cc",
-                   flags::HelpFormat::kHumanReadable, kTestUsageMessage);
-  EXPECT_EQ(test_buf_04.str(),
-            R"(usage_test: Custom usage message
-
-No flags matched.
-
-Try --helpfull to get a list of all flags or --help=substring shows help for
-flags which include specified substring in either in the name, or description or
-path.
-)");
-
-  std::stringstream test_buf_05;
-  flags::FlagsHelp(test_buf_05, "", flags::HelpFormat::kHumanReadable,
-                   kTestUsageMessage);
-  std::string test_out = test_buf_05.str();
-  absl::string_view test_out_str(test_out);
-  EXPECT_TRUE(
-      absl::StartsWith(test_out_str, "usage_test: Custom usage message"));
-  EXPECT_TRUE(absl::StrContains(
-      test_out_str, "Flags from absl/flags/internal/usage_test.cc:"));
-  EXPECT_TRUE(
-      absl::StrContains(test_out_str, "-usage_reporting_test_flag_01 "));
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(UsageReportingTest, TestNoUsageFlags) {
-  std::stringstream test_buf;
-  EXPECT_EQ(flags::HandleUsageFlags(test_buf, kTestUsageMessage), -1);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(UsageReportingTest, TestUsageFlag_helpshort) {
-  flags::SetFlagsHelpMode(flags::HelpMode::kShort);
-
-  std::stringstream test_buf;
-  EXPECT_EQ(flags::HandleUsageFlags(test_buf, kTestUsageMessage), 1);
-  EXPECT_EQ(test_buf.str(),
-            R"(usage_test: Custom usage message
-
-  Flags from absl/flags/internal/usage_test.cc:
-    --usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
-      default: 101;
-    --usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
-      default: false;
-    --usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
-      default: 1.03;
-    --usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
-      default: 1000000000000004;
-    --usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
-      default: UDT{};
-    --usage_reporting_test_flag_06 (usage_reporting_test_flag_06 help message.
-
-      Some more help.
-      Even more long long long long long long long long long long long long help
-      message.); default: "";
-
-Try --helpfull to get a list of all flags or --help=substring shows help for
-flags which include specified substring in either in the name, or description or
-path.
-)");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(UsageReportingTest, TestUsageFlag_help_simple) {
-  flags::SetFlagsHelpMode(flags::HelpMode::kImportant);
-
-  std::stringstream test_buf;
-  EXPECT_EQ(flags::HandleUsageFlags(test_buf, kTestUsageMessage), 1);
-  EXPECT_EQ(test_buf.str(),
-            R"(usage_test: Custom usage message
-
-  Flags from absl/flags/internal/usage_test.cc:
-    --usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
-      default: 101;
-    --usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
-      default: false;
-    --usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
-      default: 1.03;
-    --usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
-      default: 1000000000000004;
-    --usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
-      default: UDT{};
-    --usage_reporting_test_flag_06 (usage_reporting_test_flag_06 help message.
-
-      Some more help.
-      Even more long long long long long long long long long long long long help
-      message.); default: "";
-
-Try --helpfull to get a list of all flags or --help=substring shows help for
-flags which include specified substring in either in the name, or description or
-path.
-)");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(UsageReportingTest, TestUsageFlag_help_one_flag) {
-  flags::SetFlagsHelpMode(flags::HelpMode::kMatch);
-  flags::SetFlagsHelpMatchSubstr("usage_reporting_test_flag_06");
-
-  std::stringstream test_buf;
-  EXPECT_EQ(flags::HandleUsageFlags(test_buf, kTestUsageMessage), 1);
-  EXPECT_EQ(test_buf.str(),
-            R"(usage_test: Custom usage message
-
-  Flags from absl/flags/internal/usage_test.cc:
-    --usage_reporting_test_flag_06 (usage_reporting_test_flag_06 help message.
-
-      Some more help.
-      Even more long long long long long long long long long long long long help
-      message.); default: "";
-
-Try --helpfull to get a list of all flags or --help=substring shows help for
-flags which include specified substring in either in the name, or description or
-path.
-)");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(UsageReportingTest, TestUsageFlag_help_multiple_flag) {
-  flags::SetFlagsHelpMode(flags::HelpMode::kMatch);
-  flags::SetFlagsHelpMatchSubstr("test_flag");
-
-  std::stringstream test_buf;
-  EXPECT_EQ(flags::HandleUsageFlags(test_buf, kTestUsageMessage), 1);
-  EXPECT_EQ(test_buf.str(),
-            R"(usage_test: Custom usage message
-
-  Flags from absl/flags/internal/usage_test.cc:
-    --usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
-      default: 101;
-    --usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
-      default: false;
-    --usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
-      default: 1.03;
-    --usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
-      default: 1000000000000004;
-    --usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
-      default: UDT{};
-    --usage_reporting_test_flag_06 (usage_reporting_test_flag_06 help message.
-
-      Some more help.
-      Even more long long long long long long long long long long long long help
-      message.); default: "";
-
-Try --helpfull to get a list of all flags or --help=substring shows help for
-flags which include specified substring in either in the name, or description or
-path.
-)");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(UsageReportingTest, TestUsageFlag_helppackage) {
-  flags::SetFlagsHelpMode(flags::HelpMode::kPackage);
-
-  std::stringstream test_buf;
-  EXPECT_EQ(flags::HandleUsageFlags(test_buf, kTestUsageMessage), 1);
-  EXPECT_EQ(test_buf.str(),
-            R"(usage_test: Custom usage message
-
-  Flags from absl/flags/internal/usage_test.cc:
-    --usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
-      default: 101;
-    --usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
-      default: false;
-    --usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
-      default: 1.03;
-    --usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
-      default: 1000000000000004;
-    --usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
-      default: UDT{};
-    --usage_reporting_test_flag_06 (usage_reporting_test_flag_06 help message.
-
-      Some more help.
-      Even more long long long long long long long long long long long long help
-      message.); default: "";
-
-Try --helpfull to get a list of all flags or --help=substring shows help for
-flags which include specified substring in either in the name, or description or
-path.
-)");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(UsageReportingTest, TestUsageFlag_version) {
-  flags::SetFlagsHelpMode(flags::HelpMode::kVersion);
-
-  std::stringstream test_buf;
-  EXPECT_EQ(flags::HandleUsageFlags(test_buf, kTestUsageMessage), 0);
-#ifndef NDEBUG
-  EXPECT_EQ(test_buf.str(), "usage_test\nDebug build (NDEBUG not #defined)\n");
-#else
-  EXPECT_EQ(test_buf.str(), "usage_test\n");
-#endif
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(UsageReportingTest, TestUsageFlag_only_check_args) {
-  flags::SetFlagsHelpMode(flags::HelpMode::kOnlyCheckArgs);
-
-  std::stringstream test_buf;
-  EXPECT_EQ(flags::HandleUsageFlags(test_buf, kTestUsageMessage), 0);
-  EXPECT_EQ(test_buf.str(), "");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(UsageReportingTest, TestUsageFlag_helpon) {
-  flags::SetFlagsHelpMode(flags::HelpMode::kMatch);
-  flags::SetFlagsHelpMatchSubstr("/bla-bla.");
-
-  std::stringstream test_buf_01;
-  EXPECT_EQ(flags::HandleUsageFlags(test_buf_01, kTestUsageMessage), 1);
-  EXPECT_EQ(test_buf_01.str(),
-            R"(usage_test: Custom usage message
-
-No flags matched.
-
-Try --helpfull to get a list of all flags or --help=substring shows help for
-flags which include specified substring in either in the name, or description or
-path.
-)");
-
-  flags::SetFlagsHelpMatchSubstr("/usage_test.");
-
-  std::stringstream test_buf_02;
-  EXPECT_EQ(flags::HandleUsageFlags(test_buf_02, kTestUsageMessage), 1);
-  EXPECT_EQ(test_buf_02.str(),
-            R"(usage_test: Custom usage message
-
-  Flags from absl/flags/internal/usage_test.cc:
-    --usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
-      default: 101;
-    --usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
-      default: false;
-    --usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
-      default: 1.03;
-    --usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
-      default: 1000000000000004;
-    --usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
-      default: UDT{};
-    --usage_reporting_test_flag_06 (usage_reporting_test_flag_06 help message.
-
-      Some more help.
-      Even more long long long long long long long long long long long long help
-      message.); default: "";
-
-Try --helpfull to get a list of all flags or --help=substring shows help for
-flags which include specified substring in either in the name, or description or
-path.
-)");
-}
-
-// --------------------------------------------------------------------
-
-}  // namespace
-
-int main(int argc, char* argv[]) {
-  (void)absl::GetFlag(FLAGS_undefok);  // Force linking of parse.cc
-  flags::SetProgramInvocationName("usage_test");
-  absl::SetProgramUsageMessage(kTestUsageMessage);
-  ::testing::InitGoogleTest(&argc, argv);
-
-  return RUN_ALL_TESTS();
-}
diff --git a/third_party/abseil_cpp/absl/flags/marshalling.cc b/third_party/abseil_cpp/absl/flags/marshalling.cc
deleted file mode 100644
index 81f9cebd6f41..000000000000
--- a/third_party/abseil_cpp/absl/flags/marshalling.cc
+++ /dev/null
@@ -1,241 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/marshalling.h"
-
-#include <stddef.h>
-
-#include <cmath>
-#include <limits>
-#include <string>
-#include <type_traits>
-#include <vector>
-
-#include "absl/base/config.h"
-#include "absl/base/log_severity.h"
-#include "absl/base/macros.h"
-#include "absl/strings/ascii.h"
-#include "absl/strings/match.h"
-#include "absl/strings/numbers.h"
-#include "absl/strings/str_cat.h"
-#include "absl/strings/str_format.h"
-#include "absl/strings/str_join.h"
-#include "absl/strings/str_split.h"
-#include "absl/strings/string_view.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-
-// --------------------------------------------------------------------
-// AbslParseFlag specializations for boolean type.
-
-bool AbslParseFlag(absl::string_view text, bool* dst, std::string*) {
-  const char* kTrue[] = {"1", "t", "true", "y", "yes"};
-  const char* kFalse[] = {"0", "f", "false", "n", "no"};
-  static_assert(sizeof(kTrue) == sizeof(kFalse), "true_false_equal");
-
-  text = absl::StripAsciiWhitespace(text);
-
-  for (size_t i = 0; i < ABSL_ARRAYSIZE(kTrue); ++i) {
-    if (absl::EqualsIgnoreCase(text, kTrue[i])) {
-      *dst = true;
-      return true;
-    } else if (absl::EqualsIgnoreCase(text, kFalse[i])) {
-      *dst = false;
-      return true;
-    }
-  }
-  return false;  // didn't match a legal input
-}
-
-// --------------------------------------------------------------------
-// AbslParseFlag for integral types.
-
-// Return the base to use for parsing text as an integer.  Leading 0x
-// puts us in base 16.  But leading 0 does not put us in base 8. It
-// caused too many bugs when we had that behavior.
-static int NumericBase(absl::string_view text) {
-  const bool hex = (text.size() >= 2 && text[0] == '0' &&
-                    (text[1] == 'x' || text[1] == 'X'));
-  return hex ? 16 : 10;
-}
-
-template <typename IntType>
-inline bool ParseFlagImpl(absl::string_view text, IntType& dst) {
-  text = absl::StripAsciiWhitespace(text);
-
-  return absl::numbers_internal::safe_strtoi_base(text, &dst,
-                                                  NumericBase(text));
-}
-
-bool AbslParseFlag(absl::string_view text, short* dst, std::string*) {
-  int val;
-  if (!ParseFlagImpl(text, val)) return false;
-  if (static_cast<short>(val) != val)  // worked, but number out of range
-    return false;
-  *dst = static_cast<short>(val);
-  return true;
-}
-
-bool AbslParseFlag(absl::string_view text, unsigned short* dst, std::string*) {
-  unsigned int val;
-  if (!ParseFlagImpl(text, val)) return false;
-  if (static_cast<unsigned short>(val) !=
-      val)  // worked, but number out of range
-    return false;
-  *dst = static_cast<unsigned short>(val);
-  return true;
-}
-
-bool AbslParseFlag(absl::string_view text, int* dst, std::string*) {
-  return ParseFlagImpl(text, *dst);
-}
-
-bool AbslParseFlag(absl::string_view text, unsigned int* dst, std::string*) {
-  return ParseFlagImpl(text, *dst);
-}
-
-bool AbslParseFlag(absl::string_view text, long* dst, std::string*) {
-  return ParseFlagImpl(text, *dst);
-}
-
-bool AbslParseFlag(absl::string_view text, unsigned long* dst, std::string*) {
-  return ParseFlagImpl(text, *dst);
-}
-
-bool AbslParseFlag(absl::string_view text, long long* dst, std::string*) {
-  return ParseFlagImpl(text, *dst);
-}
-
-bool AbslParseFlag(absl::string_view text, unsigned long long* dst,
-                   std::string*) {
-  return ParseFlagImpl(text, *dst);
-}
-
-// --------------------------------------------------------------------
-// AbslParseFlag for floating point types.
-
-bool AbslParseFlag(absl::string_view text, float* dst, std::string*) {
-  return absl::SimpleAtof(text, dst);
-}
-
-bool AbslParseFlag(absl::string_view text, double* dst, std::string*) {
-  return absl::SimpleAtod(text, dst);
-}
-
-// --------------------------------------------------------------------
-// AbslParseFlag for strings.
-
-bool AbslParseFlag(absl::string_view text, std::string* dst, std::string*) {
-  dst->assign(text.data(), text.size());
-  return true;
-}
-
-// --------------------------------------------------------------------
-// AbslParseFlag for vector of strings.
-
-bool AbslParseFlag(absl::string_view text, std::vector<std::string>* dst,
-                   std::string*) {
-  // An empty flag value corresponds to an empty vector, not a vector
-  // with a single, empty std::string.
-  if (text.empty()) {
-    dst->clear();
-    return true;
-  }
-  *dst = absl::StrSplit(text, ',', absl::AllowEmpty());
-  return true;
-}
-
-// --------------------------------------------------------------------
-// AbslUnparseFlag specializations for various builtin flag types.
-
-std::string Unparse(bool v) { return v ? "true" : "false"; }
-std::string Unparse(short v) { return absl::StrCat(v); }
-std::string Unparse(unsigned short v) { return absl::StrCat(v); }
-std::string Unparse(int v) { return absl::StrCat(v); }
-std::string Unparse(unsigned int v) { return absl::StrCat(v); }
-std::string Unparse(long v) { return absl::StrCat(v); }
-std::string Unparse(unsigned long v) { return absl::StrCat(v); }
-std::string Unparse(long long v) { return absl::StrCat(v); }
-std::string Unparse(unsigned long long v) { return absl::StrCat(v); }
-template <typename T>
-std::string UnparseFloatingPointVal(T v) {
-  // digits10 is guaranteed to roundtrip correctly in string -> value -> string
-  // conversions, but may not be enough to represent all the values correctly.
-  std::string digit10_str =
-      absl::StrFormat("%.*g", std::numeric_limits<T>::digits10, v);
-  if (std::isnan(v) || std::isinf(v)) return digit10_str;
-
-  T roundtrip_val = 0;
-  std::string err;
-  if (absl::ParseFlag(digit10_str, &roundtrip_val, &err) &&
-      roundtrip_val == v) {
-    return digit10_str;
-  }
-
-  // max_digits10 is the number of base-10 digits that are necessary to uniquely
-  // represent all distinct values.
-  return absl::StrFormat("%.*g", std::numeric_limits<T>::max_digits10, v);
-}
-std::string Unparse(float v) { return UnparseFloatingPointVal(v); }
-std::string Unparse(double v) { return UnparseFloatingPointVal(v); }
-std::string AbslUnparseFlag(absl::string_view v) { return std::string(v); }
-std::string AbslUnparseFlag(const std::vector<std::string>& v) {
-  return absl::StrJoin(v, ",");
-}
-
-}  // namespace flags_internal
-
-bool AbslParseFlag(absl::string_view text, absl::LogSeverity* dst,
-                   std::string* err) {
-  text = absl::StripAsciiWhitespace(text);
-  if (text.empty()) {
-    *err = "no value provided";
-    return false;
-  }
-  if (text.front() == 'k' || text.front() == 'K') text.remove_prefix(1);
-  if (absl::EqualsIgnoreCase(text, "info")) {
-    *dst = absl::LogSeverity::kInfo;
-    return true;
-  }
-  if (absl::EqualsIgnoreCase(text, "warning")) {
-    *dst = absl::LogSeverity::kWarning;
-    return true;
-  }
-  if (absl::EqualsIgnoreCase(text, "error")) {
-    *dst = absl::LogSeverity::kError;
-    return true;
-  }
-  if (absl::EqualsIgnoreCase(text, "fatal")) {
-    *dst = absl::LogSeverity::kFatal;
-    return true;
-  }
-  std::underlying_type<absl::LogSeverity>::type numeric_value;
-  if (absl::ParseFlag(text, &numeric_value, err)) {
-    *dst = static_cast<absl::LogSeverity>(numeric_value);
-    return true;
-  }
-  *err = "only integers and absl::LogSeverity enumerators are accepted";
-  return false;
-}
-
-std::string AbslUnparseFlag(absl::LogSeverity v) {
-  if (v == absl::NormalizeLogSeverity(v)) return absl::LogSeverityName(v);
-  return absl::UnparseFlag(static_cast<int>(v));
-}
-
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/flags/marshalling.h b/third_party/abseil_cpp/absl/flags/marshalling.h
deleted file mode 100644
index 0b5033547e97..000000000000
--- a/third_party/abseil_cpp/absl/flags/marshalling.h
+++ /dev/null
@@ -1,264 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-// -----------------------------------------------------------------------------
-// File: marshalling.h
-// -----------------------------------------------------------------------------
-//
-// This header file defines the API for extending Abseil flag support to
-// custom types, and defines the set of overloads for fundamental types.
-//
-// Out of the box, the Abseil flags library supports the following types:
-//
-// * `bool`
-// * `int16_t`
-// * `uint16_t`
-// * `int32_t`
-// * `uint32_t`
-// * `int64_t`
-// * `uint64_t`
-// * `float`
-// * `double`
-// * `std::string`
-// * `std::vector<std::string>`
-// * `absl::LogSeverity` (provided natively for layering reasons)
-//
-// Note that support for integral types is implemented using overloads for
-// variable-width fundamental types (`short`, `int`, `long`, etc.). However,
-// you should prefer the fixed-width integral types (`int32_t`, `uint64_t`,
-// etc.) we've noted above within flag definitions.
-//
-// In addition, several Abseil libraries provide their own custom support for
-// Abseil flags. Documentation for these formats is provided in the type's
-// `AbslParseFlag()` definition.
-//
-// The Abseil time library provides the following support for civil time values:
-//
-// * `absl::CivilSecond`
-// * `absl::CivilMinute`
-// * `absl::CivilHour`
-// * `absl::CivilDay`
-// * `absl::CivilMonth`
-// * `absl::CivilYear`
-//
-// and also provides support for the following absolute time values:
-//
-// * `absl::Duration`
-// * `absl::Time`
-//
-// Additional support for Abseil types will be noted here as it is added.
-//
-// You can also provide your own custom flags by adding overloads for
-// `AbslParseFlag()` and `AbslUnparseFlag()` to your type definitions. (See
-// below.)
-//
-// -----------------------------------------------------------------------------
-// Adding Type Support for Abseil Flags
-// -----------------------------------------------------------------------------
-//
-// To add support for your user-defined type, add overloads of `AbslParseFlag()`
-// and `AbslUnparseFlag()` as free (non-member) functions to your type. If `T`
-// is a class type, these functions can be friend function definitions. These
-// overloads must be added to the same namespace where the type is defined, so
-// that they can be discovered by Argument-Dependent Lookup (ADL).
-//
-// Example:
-//
-//   namespace foo {
-//
-//   enum OutputMode { kPlainText, kHtml };
-//
-//   // AbslParseFlag converts from a string to OutputMode.
-//   // Must be in same namespace as OutputMode.
-//
-//   // Parses an OutputMode from the command line flag value `text. Returns
-//   // `true` and sets `*mode` on success; returns `false` and sets `*error`
-//   // on failure.
-//   bool AbslParseFlag(absl::string_view text,
-//                      OutputMode* mode,
-//                      std::string* error) {
-//     if (text == "plaintext") {
-//       *mode = kPlainText;
-//       return true;
-//     }
-//     if (text == "html") {
-//       *mode = kHtml;
-//      return true;
-//     }
-//     *error = "unknown value for enumeration";
-//     return false;
-//  }
-//
-//  // AbslUnparseFlag converts from an OutputMode to a string.
-//  // Must be in same namespace as OutputMode.
-//
-//  // Returns a textual flag value corresponding to the OutputMode `mode`.
-//  std::string AbslUnparseFlag(OutputMode mode) {
-//    switch (mode) {
-//      case kPlainText: return "plaintext";
-//      case kHtml: return "html";
-//    }
-//    return absl::StrCat(mode);
-//  }
-//
-// Notice that neither `AbslParseFlag()` nor `AbslUnparseFlag()` are class
-// members, but free functions. `AbslParseFlag/AbslUnparseFlag()` overloads
-// for a type should only be declared in the same file and namespace as said
-// type. The proper `AbslParseFlag/AbslUnparseFlag()` implementations for a
-// given type will be discovered via Argument-Dependent Lookup (ADL).
-//
-// `AbslParseFlag()` may need, in turn, to parse simpler constituent types
-// using `absl::ParseFlag()`. For example, a custom struct `MyFlagType`
-// consisting of a `std::pair<int, std::string>` would add an `AbslParseFlag()`
-// overload for its `MyFlagType` like so:
-//
-// Example:
-//
-//   namespace my_flag_type {
-//
-//   struct MyFlagType {
-//     std::pair<int, std::string> my_flag_data;
-//   };
-//
-//   bool AbslParseFlag(absl::string_view text, MyFlagType* flag,
-//                      std::string* err);
-//
-//   std::string AbslUnparseFlag(const MyFlagType&);
-//
-//   // Within the implementation, `AbslParseFlag()` will, in turn invoke
-//   // `absl::ParseFlag()` on its constituent `int` and `std::string` types
-//   // (which have built-in Abseil flag support.
-//
-//   bool AbslParseFlag(absl::string_view text, MyFlagType* flag,
-//                      std::string* err) {
-//     std::pair<absl::string_view, absl::string_view> tokens =
-//         absl::StrSplit(text, ',');
-//     if (!absl::ParseFlag(tokens.first, &flag->my_flag_data.first, err))
-//         return false;
-//     if (!absl::ParseFlag(tokens.second, &flag->my_flag_data.second, err))
-//         return false;
-//     return true;
-//   }
-//
-//   // Similarly, for unparsing, we can simply invoke `absl::UnparseFlag()` on
-//   // the constituent types.
-//   std::string AbslUnparseFlag(const MyFlagType& flag) {
-//     return absl::StrCat(absl::UnparseFlag(flag.my_flag_data.first),
-//                         ",",
-//                         absl::UnparseFlag(flag.my_flag_data.second));
-//   }
-#ifndef ABSL_FLAGS_MARSHALLING_H_
-#define ABSL_FLAGS_MARSHALLING_H_
-
-#include <string>
-#include <vector>
-
-#include "absl/base/config.h"
-#include "absl/strings/string_view.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-
-// Overloads of `AbslParseFlag()` and `AbslUnparseFlag()` for fundamental types.
-bool AbslParseFlag(absl::string_view, bool*, std::string*);
-bool AbslParseFlag(absl::string_view, short*, std::string*);           // NOLINT
-bool AbslParseFlag(absl::string_view, unsigned short*, std::string*);  // NOLINT
-bool AbslParseFlag(absl::string_view, int*, std::string*);             // NOLINT
-bool AbslParseFlag(absl::string_view, unsigned int*, std::string*);    // NOLINT
-bool AbslParseFlag(absl::string_view, long*, std::string*);            // NOLINT
-bool AbslParseFlag(absl::string_view, unsigned long*, std::string*);   // NOLINT
-bool AbslParseFlag(absl::string_view, long long*, std::string*);       // NOLINT
-bool AbslParseFlag(absl::string_view, unsigned long long*,             // NOLINT
-                   std::string*);
-bool AbslParseFlag(absl::string_view, float*, std::string*);
-bool AbslParseFlag(absl::string_view, double*, std::string*);
-bool AbslParseFlag(absl::string_view, std::string*, std::string*);
-bool AbslParseFlag(absl::string_view, std::vector<std::string>*, std::string*);
-
-template <typename T>
-bool InvokeParseFlag(absl::string_view input, T* dst, std::string* err) {
-  // Comment on next line provides a good compiler error message if T
-  // does not have AbslParseFlag(absl::string_view, T*, std::string*).
-  return AbslParseFlag(input, dst, err);  // Is T missing AbslParseFlag?
-}
-
-// Strings and std:: containers do not have the same overload resolution
-// considerations as fundamental types. Naming these 'AbslUnparseFlag' means we
-// can avoid the need for additional specializations of Unparse (below).
-std::string AbslUnparseFlag(absl::string_view v);
-std::string AbslUnparseFlag(const std::vector<std::string>&);
-
-template <typename T>
-std::string Unparse(const T& v) {
-  // Comment on next line provides a good compiler error message if T does not
-  // have UnparseFlag.
-  return AbslUnparseFlag(v);  // Is T missing AbslUnparseFlag?
-}
-
-// Overloads for builtin types.
-std::string Unparse(bool v);
-std::string Unparse(short v);               // NOLINT
-std::string Unparse(unsigned short v);      // NOLINT
-std::string Unparse(int v);                 // NOLINT
-std::string Unparse(unsigned int v);        // NOLINT
-std::string Unparse(long v);                // NOLINT
-std::string Unparse(unsigned long v);       // NOLINT
-std::string Unparse(long long v);           // NOLINT
-std::string Unparse(unsigned long long v);  // NOLINT
-std::string Unparse(float v);
-std::string Unparse(double v);
-
-}  // namespace flags_internal
-
-// ParseFlag()
-//
-// Parses a string value into a flag value of type `T`. Do not add overloads of
-// this function for your type directly; instead, add an `AbslParseFlag()`
-// free function as documented above.
-//
-// Some implementations of `AbslParseFlag()` for types which consist of other,
-// constituent types which already have Abseil flag support, may need to call
-// `absl::ParseFlag()` on those consituent string values. (See above.)
-template <typename T>
-inline bool ParseFlag(absl::string_view input, T* dst, std::string* error) {
-  return flags_internal::InvokeParseFlag(input, dst, error);
-}
-
-// UnparseFlag()
-//
-// Unparses a flag value of type `T` into a string value. Do not add overloads
-// of this function for your type directly; instead, add an `AbslUnparseFlag()`
-// free function as documented above.
-//
-// Some implementations of `AbslUnparseFlag()` for types which consist of other,
-// constituent types which already have Abseil flag support, may want to call
-// `absl::UnparseFlag()` on those constituent types. (See above.)
-template <typename T>
-inline std::string UnparseFlag(const T& v) {
-  return flags_internal::Unparse(v);
-}
-
-// Overloads for `absl::LogSeverity` can't (easily) appear alongside that type's
-// definition because it is layered below flags.  See proper documentation in
-// base/log_severity.h.
-enum class LogSeverity : int;
-bool AbslParseFlag(absl::string_view, absl::LogSeverity*, std::string*);
-std::string AbslUnparseFlag(absl::LogSeverity);
-
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_FLAGS_MARSHALLING_H_
diff --git a/third_party/abseil_cpp/absl/flags/marshalling_test.cc b/third_party/abseil_cpp/absl/flags/marshalling_test.cc
deleted file mode 100644
index 4a64ce11a165..000000000000
--- a/third_party/abseil_cpp/absl/flags/marshalling_test.cc
+++ /dev/null
@@ -1,904 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/marshalling.h"
-
-#include <stdint.h>
-
-#include <cmath>
-#include <limits>
-#include <string>
-#include <vector>
-
-#include "gtest/gtest.h"
-
-namespace {
-
-TEST(MarshallingTest, TestBoolParsing) {
-  std::string err;
-  bool value;
-
-  // True values.
-  EXPECT_TRUE(absl::ParseFlag("True", &value, &err));
-  EXPECT_TRUE(value);
-  EXPECT_TRUE(absl::ParseFlag("true", &value, &err));
-  EXPECT_TRUE(value);
-  EXPECT_TRUE(absl::ParseFlag("TRUE", &value, &err));
-  EXPECT_TRUE(value);
-
-  EXPECT_TRUE(absl::ParseFlag("Yes", &value, &err));
-  EXPECT_TRUE(value);
-  EXPECT_TRUE(absl::ParseFlag("yes", &value, &err));
-  EXPECT_TRUE(value);
-  EXPECT_TRUE(absl::ParseFlag("YES", &value, &err));
-  EXPECT_TRUE(value);
-
-  EXPECT_TRUE(absl::ParseFlag("t", &value, &err));
-  EXPECT_TRUE(value);
-  EXPECT_TRUE(absl::ParseFlag("T", &value, &err));
-  EXPECT_TRUE(value);
-
-  EXPECT_TRUE(absl::ParseFlag("y", &value, &err));
-  EXPECT_TRUE(value);
-  EXPECT_TRUE(absl::ParseFlag("Y", &value, &err));
-  EXPECT_TRUE(value);
-
-  EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
-  EXPECT_TRUE(value);
-
-  // False values.
-  EXPECT_TRUE(absl::ParseFlag("False", &value, &err));
-  EXPECT_FALSE(value);
-  EXPECT_TRUE(absl::ParseFlag("false", &value, &err));
-  EXPECT_FALSE(value);
-  EXPECT_TRUE(absl::ParseFlag("FALSE", &value, &err));
-  EXPECT_FALSE(value);
-
-  EXPECT_TRUE(absl::ParseFlag("No", &value, &err));
-  EXPECT_FALSE(value);
-  EXPECT_TRUE(absl::ParseFlag("no", &value, &err));
-  EXPECT_FALSE(value);
-  EXPECT_TRUE(absl::ParseFlag("NO", &value, &err));
-  EXPECT_FALSE(value);
-
-  EXPECT_TRUE(absl::ParseFlag("f", &value, &err));
-  EXPECT_FALSE(value);
-  EXPECT_TRUE(absl::ParseFlag("F", &value, &err));
-  EXPECT_FALSE(value);
-
-  EXPECT_TRUE(absl::ParseFlag("n", &value, &err));
-  EXPECT_FALSE(value);
-  EXPECT_TRUE(absl::ParseFlag("N", &value, &err));
-  EXPECT_FALSE(value);
-
-  EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
-  EXPECT_FALSE(value);
-
-  // Whitespace handling.
-  EXPECT_TRUE(absl::ParseFlag("  true", &value, &err));
-  EXPECT_TRUE(value);
-  EXPECT_TRUE(absl::ParseFlag("true  ", &value, &err));
-  EXPECT_TRUE(value);
-  EXPECT_TRUE(absl::ParseFlag("  true   ", &value, &err));
-  EXPECT_TRUE(value);
-
-  // Invalid input.
-  EXPECT_FALSE(absl::ParseFlag("", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("  ", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("2", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("11", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("tt", &value, &err));
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestInt16Parsing) {
-  std::string err;
-  int16_t value;
-
-  // Decimal values.
-  EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
-  EXPECT_EQ(value, 1);
-  EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
-  EXPECT_EQ(value, 0);
-  EXPECT_TRUE(absl::ParseFlag("-1", &value, &err));
-  EXPECT_EQ(value, -1);
-  EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
-  EXPECT_EQ(value, 123);
-  EXPECT_TRUE(absl::ParseFlag("-18765", &value, &err));
-  EXPECT_EQ(value, -18765);
-  EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
-  EXPECT_EQ(value, 3);
-
-  // Leading zero values.
-  EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
-  EXPECT_EQ(value, 1);
-  EXPECT_TRUE(absl::ParseFlag("-001", &value, &err));
-  EXPECT_EQ(value, -1);
-  EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
-  EXPECT_EQ(value, 100);
-
-  // Hex values.
-  EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
-  EXPECT_EQ(value, 16);
-  EXPECT_TRUE(absl::ParseFlag("0X234", &value, &err));
-  EXPECT_EQ(value, 564);
-  // TODO(rogeeff): fix below validations
-  EXPECT_FALSE(absl::ParseFlag("-0x7FFD", &value, &err));
-  EXPECT_NE(value, -3);
-  EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
-  EXPECT_NE(value, 49);
-
-  // Whitespace handling
-  EXPECT_TRUE(absl::ParseFlag("10  ", &value, &err));
-  EXPECT_EQ(value, 10);
-  EXPECT_TRUE(absl::ParseFlag("  11", &value, &err));
-  EXPECT_EQ(value, 11);
-  EXPECT_TRUE(absl::ParseFlag("  012  ", &value, &err));
-  EXPECT_EQ(value, 12);
-  EXPECT_TRUE(absl::ParseFlag(" 0x22    ", &value, &err));
-  EXPECT_EQ(value, 34);
-
-  // Invalid values.
-  EXPECT_FALSE(absl::ParseFlag("", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("  ", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("40000", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestUint16Parsing) {
-  std::string err;
-  uint16_t value;
-
-  // Decimal values.
-  EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
-  EXPECT_EQ(value, 1);
-  EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
-  EXPECT_EQ(value, 0);
-  EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
-  EXPECT_EQ(value, 123);
-  EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
-  EXPECT_EQ(value, 3);
-
-  // Leading zero values.
-  EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
-  EXPECT_EQ(value, 1);
-  EXPECT_TRUE(absl::ParseFlag("001", &value, &err));
-  EXPECT_EQ(value, 1);
-  EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
-  EXPECT_EQ(value, 100);
-
-  // Hex values.
-  EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
-  EXPECT_EQ(value, 16);
-  EXPECT_TRUE(absl::ParseFlag("0X234", &value, &err));
-  EXPECT_EQ(value, 564);
-  // TODO(rogeeff): fix below validations
-  EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
-  EXPECT_NE(value, 49);
-
-  // Whitespace handling
-  EXPECT_TRUE(absl::ParseFlag("10  ", &value, &err));
-  EXPECT_EQ(value, 10);
-  EXPECT_TRUE(absl::ParseFlag("  11", &value, &err));
-  EXPECT_EQ(value, 11);
-  EXPECT_TRUE(absl::ParseFlag("  012  ", &value, &err));
-  EXPECT_EQ(value, 12);
-  EXPECT_TRUE(absl::ParseFlag(" 0x22    ", &value, &err));
-  EXPECT_EQ(value, 34);
-
-  // Invalid values.
-  EXPECT_FALSE(absl::ParseFlag("", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("  ", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("70000", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("-1", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestInt32Parsing) {
-  std::string err;
-  int32_t value;
-
-  // Decimal values.
-  EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
-  EXPECT_EQ(value, 1);
-  EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
-  EXPECT_EQ(value, 0);
-  EXPECT_TRUE(absl::ParseFlag("-1", &value, &err));
-  EXPECT_EQ(value, -1);
-  EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
-  EXPECT_EQ(value, 123);
-  EXPECT_TRUE(absl::ParseFlag("-98765", &value, &err));
-  EXPECT_EQ(value, -98765);
-  EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
-  EXPECT_EQ(value, 3);
-
-  // Leading zero values.
-  EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
-  EXPECT_EQ(value, 1);
-  EXPECT_TRUE(absl::ParseFlag("-001", &value, &err));
-  EXPECT_EQ(value, -1);
-  EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
-  EXPECT_EQ(value, 100);
-
-  // Hex values.
-  EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
-  EXPECT_EQ(value, 16);
-  EXPECT_TRUE(absl::ParseFlag("0X234", &value, &err));
-  EXPECT_EQ(value, 564);
-  // TODO(rogeeff): fix below validations
-  EXPECT_FALSE(absl::ParseFlag("-0x7FFFFFFD", &value, &err));
-  EXPECT_NE(value, -3);
-  EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
-  EXPECT_NE(value, 49);
-
-  // Whitespace handling
-  EXPECT_TRUE(absl::ParseFlag("10  ", &value, &err));
-  EXPECT_EQ(value, 10);
-  EXPECT_TRUE(absl::ParseFlag("  11", &value, &err));
-  EXPECT_EQ(value, 11);
-  EXPECT_TRUE(absl::ParseFlag("  012  ", &value, &err));
-  EXPECT_EQ(value, 12);
-  EXPECT_TRUE(absl::ParseFlag(" 0x22    ", &value, &err));
-  EXPECT_EQ(value, 34);
-
-  // Invalid values.
-  EXPECT_FALSE(absl::ParseFlag("", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("  ", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("70000000000", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestUint32Parsing) {
-  std::string err;
-  uint32_t value;
-
-  // Decimal values.
-  EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
-  EXPECT_EQ(value, 1);
-  EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
-  EXPECT_EQ(value, 0);
-  EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
-  EXPECT_EQ(value, 123);
-  EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
-  EXPECT_EQ(value, 3);
-
-  // Leading zero values.
-  EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
-  EXPECT_EQ(value, 1);
-  EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
-  EXPECT_EQ(value, 100);
-
-  // Hex values.
-  EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
-  EXPECT_EQ(value, 16);
-  EXPECT_TRUE(absl::ParseFlag("0X234", &value, &err));
-  EXPECT_EQ(value, 564);
-  EXPECT_TRUE(absl::ParseFlag("0xFFFFFFFD", &value, &err));
-  EXPECT_EQ(value, 4294967293);
-  // TODO(rogeeff): fix below validations
-  EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
-  EXPECT_NE(value, 49);
-
-  // Whitespace handling
-  EXPECT_TRUE(absl::ParseFlag("10  ", &value, &err));
-  EXPECT_EQ(value, 10);
-  EXPECT_TRUE(absl::ParseFlag("  11", &value, &err));
-  EXPECT_EQ(value, 11);
-  EXPECT_TRUE(absl::ParseFlag("  012  ", &value, &err));
-  EXPECT_EQ(value, 12);
-  EXPECT_TRUE(absl::ParseFlag(" 0x22    ", &value, &err));
-  EXPECT_EQ(value, 34);
-
-  // Invalid values.
-  EXPECT_FALSE(absl::ParseFlag("", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("  ", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("140000000000", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("-1", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestInt64Parsing) {
-  std::string err;
-  int64_t value;
-
-  // Decimal values.
-  EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
-  EXPECT_EQ(value, 1);
-  EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
-  EXPECT_EQ(value, 0);
-  EXPECT_TRUE(absl::ParseFlag("-1", &value, &err));
-  EXPECT_EQ(value, -1);
-  EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
-  EXPECT_EQ(value, 123);
-  EXPECT_TRUE(absl::ParseFlag("-98765", &value, &err));
-  EXPECT_EQ(value, -98765);
-  EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
-  EXPECT_EQ(value, 3);
-
-  // Leading zero values.
-  EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
-  EXPECT_EQ(value, 1);
-  EXPECT_TRUE(absl::ParseFlag("001", &value, &err));
-  EXPECT_EQ(value, 1);
-  EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
-  EXPECT_EQ(value, 100);
-
-  // Hex values.
-  EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
-  EXPECT_EQ(value, 16);
-  EXPECT_TRUE(absl::ParseFlag("0XFFFAAABBBCCCDDD", &value, &err));
-  EXPECT_EQ(value, 1152827684197027293);
-  // TODO(rogeeff): fix below validation
-  EXPECT_FALSE(absl::ParseFlag("-0x7FFFFFFFFFFFFFFE", &value, &err));
-  EXPECT_NE(value, -2);
-  EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
-  EXPECT_NE(value, 49);
-
-  // Whitespace handling
-  EXPECT_TRUE(absl::ParseFlag("10  ", &value, &err));
-  EXPECT_EQ(value, 10);
-  EXPECT_TRUE(absl::ParseFlag("  11", &value, &err));
-  EXPECT_EQ(value, 11);
-  EXPECT_TRUE(absl::ParseFlag("  012  ", &value, &err));
-  EXPECT_EQ(value, 12);
-  EXPECT_TRUE(absl::ParseFlag(" 0x7F    ", &value, &err));
-  EXPECT_EQ(value, 127);
-
-  // Invalid values.
-  EXPECT_FALSE(absl::ParseFlag("", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("  ", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("0xFFFFFFFFFFFFFFFFFF", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestUInt64Parsing) {
-  std::string err;
-  uint64_t value;
-
-  // Decimal values.
-  EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
-  EXPECT_EQ(value, 1);
-  EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
-  EXPECT_EQ(value, 0);
-  EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
-  EXPECT_EQ(value, 123);
-  EXPECT_TRUE(absl::ParseFlag("+13", &value, &err));
-  EXPECT_EQ(value, 13);
-
-  // Leading zero values.
-  EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
-  EXPECT_EQ(value, 1);
-  EXPECT_TRUE(absl::ParseFlag("001", &value, &err));
-  EXPECT_EQ(value, 1);
-  EXPECT_TRUE(absl::ParseFlag("0000300", &value, &err));
-  EXPECT_EQ(value, 300);
-
-  // Hex values.
-  EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
-  EXPECT_EQ(value, 16);
-  EXPECT_TRUE(absl::ParseFlag("0XFFFF", &value, &err));
-  EXPECT_EQ(value, 65535);
-  // TODO(rogeeff): fix below validation
-  EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
-  EXPECT_NE(value, 49);
-
-  // Whitespace handling
-  EXPECT_TRUE(absl::ParseFlag("10  ", &value, &err));
-  EXPECT_EQ(value, 10);
-  EXPECT_TRUE(absl::ParseFlag("  11", &value, &err));
-  EXPECT_EQ(value, 11);
-  EXPECT_TRUE(absl::ParseFlag("  012  ", &value, &err));
-  EXPECT_EQ(value, 12);
-
-  // Invalid values.
-  EXPECT_FALSE(absl::ParseFlag("", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("  ", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("0xFFFFFFFFFFFFFFFFFF", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("-1", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestFloatParsing) {
-  std::string err;
-  float value;
-
-  // Ordinary values.
-  EXPECT_TRUE(absl::ParseFlag("1.3", &value, &err));
-  EXPECT_FLOAT_EQ(value, 1.3f);
-  EXPECT_TRUE(absl::ParseFlag("-0.1", &value, &err));
-  EXPECT_DOUBLE_EQ(value, -0.1f);
-  EXPECT_TRUE(absl::ParseFlag("+0.01", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 0.01f);
-
-  // Scientific values.
-  EXPECT_TRUE(absl::ParseFlag("1.2e3", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 1.2e3f);
-  EXPECT_TRUE(absl::ParseFlag("9.8765402e-37", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 9.8765402e-37f);
-  EXPECT_TRUE(absl::ParseFlag("0.11e+3", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 0.11e+3f);
-  EXPECT_TRUE(absl::ParseFlag("1.e-2300", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 0.f);
-  EXPECT_TRUE(absl::ParseFlag("1.e+2300", &value, &err));
-  EXPECT_TRUE(std::isinf(value));
-
-  // Leading zero values.
-  EXPECT_TRUE(absl::ParseFlag("01.6", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 1.6f);
-  EXPECT_TRUE(absl::ParseFlag("000.0001", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 0.0001f);
-
-  // Trailing zero values.
-  EXPECT_TRUE(absl::ParseFlag("-5.1000", &value, &err));
-  EXPECT_DOUBLE_EQ(value, -5.1f);
-
-  // Exceptional values.
-  EXPECT_TRUE(absl::ParseFlag("NaN", &value, &err));
-  EXPECT_TRUE(std::isnan(value));
-  EXPECT_TRUE(absl::ParseFlag("Inf", &value, &err));
-  EXPECT_TRUE(std::isinf(value));
-
-  // Hex values
-  EXPECT_TRUE(absl::ParseFlag("0x10.23p12", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 66096.f);
-  EXPECT_TRUE(absl::ParseFlag("-0xF1.A3p-2", &value, &err));
-  EXPECT_NEAR(value, -60.4092f, 5e-5f);
-  EXPECT_TRUE(absl::ParseFlag("+0x0.0AAp-12", &value, &err));
-  EXPECT_NEAR(value, 1.01328e-05f, 5e-11f);
-  EXPECT_TRUE(absl::ParseFlag("0x.01p1", &value, &err));
-  EXPECT_NEAR(value, 0.0078125f, 5e-8f);
-
-  // Whitespace handling
-  EXPECT_TRUE(absl::ParseFlag("10.1  ", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 10.1f);
-  EXPECT_TRUE(absl::ParseFlag("  2.34", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 2.34f);
-  EXPECT_TRUE(absl::ParseFlag("  5.7  ", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 5.7f);
-  EXPECT_TRUE(absl::ParseFlag("  -0xE0.F3p01  ", &value, &err));
-  EXPECT_NEAR(value, -449.8984375f, 5e-8f);
-
-  // Invalid values.
-  EXPECT_FALSE(absl::ParseFlag("", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("  ", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("2.3xxx", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("0x0.1pAA", &value, &err));
-  // TODO(rogeeff): below assertion should fail
-  EXPECT_TRUE(absl::ParseFlag("0x0.1", &value, &err));
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestDoubleParsing) {
-  std::string err;
-  double value;
-
-  // Ordinary values.
-  EXPECT_TRUE(absl::ParseFlag("1.3", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 1.3);
-  EXPECT_TRUE(absl::ParseFlag("-0.1", &value, &err));
-  EXPECT_DOUBLE_EQ(value, -0.1);
-  EXPECT_TRUE(absl::ParseFlag("+0.01", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 0.01);
-
-  // Scientific values.
-  EXPECT_TRUE(absl::ParseFlag("1.2e3", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 1.2e3);
-  EXPECT_TRUE(absl::ParseFlag("9.00000002e-123", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 9.00000002e-123);
-  EXPECT_TRUE(absl::ParseFlag("0.11e+3", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 0.11e+3);
-  EXPECT_TRUE(absl::ParseFlag("1.e-2300", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 0);
-  EXPECT_TRUE(absl::ParseFlag("1.e+2300", &value, &err));
-  EXPECT_TRUE(std::isinf(value));
-
-  // Leading zero values.
-  EXPECT_TRUE(absl::ParseFlag("01.6", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 1.6);
-  EXPECT_TRUE(absl::ParseFlag("000.0001", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 0.0001);
-
-  // Trailing zero values.
-  EXPECT_TRUE(absl::ParseFlag("-5.1000", &value, &err));
-  EXPECT_DOUBLE_EQ(value, -5.1);
-
-  // Exceptional values.
-  EXPECT_TRUE(absl::ParseFlag("NaN", &value, &err));
-  EXPECT_TRUE(std::isnan(value));
-  EXPECT_TRUE(absl::ParseFlag("nan", &value, &err));
-  EXPECT_TRUE(std::isnan(value));
-  EXPECT_TRUE(absl::ParseFlag("Inf", &value, &err));
-  EXPECT_TRUE(std::isinf(value));
-  EXPECT_TRUE(absl::ParseFlag("inf", &value, &err));
-  EXPECT_TRUE(std::isinf(value));
-
-  // Hex values
-  EXPECT_TRUE(absl::ParseFlag("0x10.23p12", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 66096);
-  EXPECT_TRUE(absl::ParseFlag("-0xF1.A3p-2", &value, &err));
-  EXPECT_NEAR(value, -60.4092, 5e-5);
-  EXPECT_TRUE(absl::ParseFlag("+0x0.0AAp-12", &value, &err));
-  EXPECT_NEAR(value, 1.01328e-05, 5e-11);
-  EXPECT_TRUE(absl::ParseFlag("0x.01p1", &value, &err));
-  EXPECT_NEAR(value, 0.0078125, 5e-8);
-
-  // Whitespace handling
-  EXPECT_TRUE(absl::ParseFlag("10.1  ", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 10.1);
-  EXPECT_TRUE(absl::ParseFlag("  2.34", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 2.34);
-  EXPECT_TRUE(absl::ParseFlag("  5.7  ", &value, &err));
-  EXPECT_DOUBLE_EQ(value, 5.7);
-  EXPECT_TRUE(absl::ParseFlag("  -0xE0.F3p01  ", &value, &err));
-  EXPECT_NEAR(value, -449.8984375, 5e-8);
-
-  // Invalid values.
-  EXPECT_FALSE(absl::ParseFlag("", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("  ", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("2.3xxx", &value, &err));
-  EXPECT_FALSE(absl::ParseFlag("0x0.1pAA", &value, &err));
-  // TODO(rogeeff): below assertion should fail
-  EXPECT_TRUE(absl::ParseFlag("0x0.1", &value, &err));
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestStringParsing) {
-  std::string err;
-  std::string value;
-
-  EXPECT_TRUE(absl::ParseFlag("", &value, &err));
-  EXPECT_EQ(value, "");
-  EXPECT_TRUE(absl::ParseFlag(" ", &value, &err));
-  EXPECT_EQ(value, " ");
-  EXPECT_TRUE(absl::ParseFlag("   ", &value, &err));
-  EXPECT_EQ(value, "   ");
-  EXPECT_TRUE(absl::ParseFlag("\n", &value, &err));
-  EXPECT_EQ(value, "\n");
-  EXPECT_TRUE(absl::ParseFlag("\t", &value, &err));
-  EXPECT_EQ(value, "\t");
-  EXPECT_TRUE(absl::ParseFlag("asdfg", &value, &err));
-  EXPECT_EQ(value, "asdfg");
-  EXPECT_TRUE(absl::ParseFlag("asdf ghjk", &value, &err));
-  EXPECT_EQ(value, "asdf ghjk");
-  EXPECT_TRUE(absl::ParseFlag("a\nb\nc", &value, &err));
-  EXPECT_EQ(value, "a\nb\nc");
-  EXPECT_TRUE(absl::ParseFlag("asd\0fgh", &value, &err));
-  EXPECT_EQ(value, "asd");
-  EXPECT_TRUE(absl::ParseFlag("\\\\", &value, &err));
-  EXPECT_EQ(value, "\\\\");
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestVectorOfStringParsing) {
-  std::string err;
-  std::vector<std::string> value;
-
-  EXPECT_TRUE(absl::ParseFlag("", &value, &err));
-  EXPECT_EQ(value, std::vector<std::string>{});
-  EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
-  EXPECT_EQ(value, std::vector<std::string>({"1"}));
-  EXPECT_TRUE(absl::ParseFlag("a,b", &value, &err));
-  EXPECT_EQ(value, std::vector<std::string>({"a", "b"}));
-  EXPECT_TRUE(absl::ParseFlag("a,b,c,", &value, &err));
-  EXPECT_EQ(value, std::vector<std::string>({"a", "b", "c", ""}));
-  EXPECT_TRUE(absl::ParseFlag("a,,", &value, &err));
-  EXPECT_EQ(value, std::vector<std::string>({"a", "", ""}));
-  EXPECT_TRUE(absl::ParseFlag(",", &value, &err));
-  EXPECT_EQ(value, std::vector<std::string>({"", ""}));
-  EXPECT_TRUE(absl::ParseFlag("a, b,c ", &value, &err));
-  EXPECT_EQ(value, std::vector<std::string>({"a", " b", "c "}));
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestBoolUnparsing) {
-  EXPECT_EQ(absl::UnparseFlag(true), "true");
-  EXPECT_EQ(absl::UnparseFlag(false), "false");
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestInt16Unparsing) {
-  int16_t value;
-
-  value = 1;
-  EXPECT_EQ(absl::UnparseFlag(value), "1");
-  value = 0;
-  EXPECT_EQ(absl::UnparseFlag(value), "0");
-  value = -1;
-  EXPECT_EQ(absl::UnparseFlag(value), "-1");
-  value = 9876;
-  EXPECT_EQ(absl::UnparseFlag(value), "9876");
-  value = -987;
-  EXPECT_EQ(absl::UnparseFlag(value), "-987");
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestUint16Unparsing) {
-  uint16_t value;
-
-  value = 1;
-  EXPECT_EQ(absl::UnparseFlag(value), "1");
-  value = 0;
-  EXPECT_EQ(absl::UnparseFlag(value), "0");
-  value = 19876;
-  EXPECT_EQ(absl::UnparseFlag(value), "19876");
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestInt32Unparsing) {
-  int32_t value;
-
-  value = 1;
-  EXPECT_EQ(absl::UnparseFlag(value), "1");
-  value = 0;
-  EXPECT_EQ(absl::UnparseFlag(value), "0");
-  value = -1;
-  EXPECT_EQ(absl::UnparseFlag(value), "-1");
-  value = 12345;
-  EXPECT_EQ(absl::UnparseFlag(value), "12345");
-  value = -987;
-  EXPECT_EQ(absl::UnparseFlag(value), "-987");
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestUint32Unparsing) {
-  uint32_t value;
-
-  value = 1;
-  EXPECT_EQ(absl::UnparseFlag(value), "1");
-  value = 0;
-  EXPECT_EQ(absl::UnparseFlag(value), "0");
-  value = 1234500;
-  EXPECT_EQ(absl::UnparseFlag(value), "1234500");
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestInt64Unparsing) {
-  int64_t value;
-
-  value = 1;
-  EXPECT_EQ(absl::UnparseFlag(value), "1");
-  value = 0;
-  EXPECT_EQ(absl::UnparseFlag(value), "0");
-  value = -1;
-  EXPECT_EQ(absl::UnparseFlag(value), "-1");
-  value = 123456789L;
-  EXPECT_EQ(absl::UnparseFlag(value), "123456789");
-  value = -987654321L;
-  EXPECT_EQ(absl::UnparseFlag(value), "-987654321");
-  value = 0x7FFFFFFFFFFFFFFF;
-  EXPECT_EQ(absl::UnparseFlag(value), "9223372036854775807");
-  value = 0xFFFFFFFFFFFFFFFF;
-  EXPECT_EQ(absl::UnparseFlag(value), "-1");
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestUint64Unparsing) {
-  uint64_t value;
-
-  value = 1;
-  EXPECT_EQ(absl::UnparseFlag(value), "1");
-  value = 0;
-  EXPECT_EQ(absl::UnparseFlag(value), "0");
-  value = 123456789L;
-  EXPECT_EQ(absl::UnparseFlag(value), "123456789");
-  value = 0xFFFFFFFFFFFFFFFF;
-  EXPECT_EQ(absl::UnparseFlag(value), "18446744073709551615");
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestFloatUnparsing) {
-  float value;
-
-  value = 1.1f;
-  EXPECT_EQ(absl::UnparseFlag(value), "1.1");
-  value = 0.01f;
-  EXPECT_EQ(absl::UnparseFlag(value), "0.01");
-  value = 1.23e-2f;
-  EXPECT_EQ(absl::UnparseFlag(value), "0.0123");
-  value = -0.71f;
-  EXPECT_EQ(absl::UnparseFlag(value), "-0.71");
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestDoubleUnparsing) {
-  double value;
-
-  value = 1.1;
-  EXPECT_EQ(absl::UnparseFlag(value), "1.1");
-  value = 0.01;
-  EXPECT_EQ(absl::UnparseFlag(value), "0.01");
-  value = 1.23e-2;
-  EXPECT_EQ(absl::UnparseFlag(value), "0.0123");
-  value = -0.71;
-  EXPECT_EQ(absl::UnparseFlag(value), "-0.71");
-  value = -0;
-  EXPECT_EQ(absl::UnparseFlag(value), "0");
-  value = std::nan("");
-  EXPECT_EQ(absl::UnparseFlag(value), "nan");
-  value = std::numeric_limits<double>::infinity();
-  EXPECT_EQ(absl::UnparseFlag(value), "inf");
-}
-
-// --------------------------------------------------------------------
-
-TEST(MarshallingTest, TestStringUnparsing) {
-  EXPECT_EQ(absl::UnparseFlag(""), "");
-  EXPECT_EQ(absl::UnparseFlag(" "), " ");
-  EXPECT_EQ(absl::UnparseFlag("qwerty"), "qwerty");
-  EXPECT_EQ(absl::UnparseFlag("ASDFGH"), "ASDFGH");
-  EXPECT_EQ(absl::UnparseFlag("\n\t  "), "\n\t  ");
-}
-
-// --------------------------------------------------------------------
-
-template <typename T>
-void TestRoundtrip(T v) {
-  T new_v;
-  std::string err;
-  EXPECT_TRUE(absl::ParseFlag(absl::UnparseFlag(v), &new_v, &err));
-  EXPECT_EQ(new_v, v);
-}
-
-TEST(MarshallingTest, TestFloatRoundTrip) {
-  TestRoundtrip(0.1f);
-  TestRoundtrip(0.12f);
-  TestRoundtrip(0.123f);
-  TestRoundtrip(0.1234f);
-  TestRoundtrip(0.12345f);
-  TestRoundtrip(0.123456f);
-  TestRoundtrip(0.1234567f);
-  TestRoundtrip(0.12345678f);
-
-  TestRoundtrip(0.1e20f);
-  TestRoundtrip(0.12e20f);
-  TestRoundtrip(0.123e20f);
-  TestRoundtrip(0.1234e20f);
-  TestRoundtrip(0.12345e20f);
-  TestRoundtrip(0.123456e20f);
-  TestRoundtrip(0.1234567e20f);
-  TestRoundtrip(0.12345678e20f);
-
-  TestRoundtrip(0.1e-20f);
-  TestRoundtrip(0.12e-20f);
-  TestRoundtrip(0.123e-20f);
-  TestRoundtrip(0.1234e-20f);
-  TestRoundtrip(0.12345e-20f);
-  TestRoundtrip(0.123456e-20f);
-  TestRoundtrip(0.1234567e-20f);
-  TestRoundtrip(0.12345678e-20f);
-}
-
-TEST(MarshallingTest, TestDoubleRoundTrip) {
-  TestRoundtrip(0.1);
-  TestRoundtrip(0.12);
-  TestRoundtrip(0.123);
-  TestRoundtrip(0.1234);
-  TestRoundtrip(0.12345);
-  TestRoundtrip(0.123456);
-  TestRoundtrip(0.1234567);
-  TestRoundtrip(0.12345678);
-  TestRoundtrip(0.123456789);
-  TestRoundtrip(0.1234567891);
-  TestRoundtrip(0.12345678912);
-  TestRoundtrip(0.123456789123);
-  TestRoundtrip(0.1234567891234);
-  TestRoundtrip(0.12345678912345);
-  TestRoundtrip(0.123456789123456);
-  TestRoundtrip(0.1234567891234567);
-  TestRoundtrip(0.12345678912345678);
-
-  TestRoundtrip(0.1e50);
-  TestRoundtrip(0.12e50);
-  TestRoundtrip(0.123e50);
-  TestRoundtrip(0.1234e50);
-  TestRoundtrip(0.12345e50);
-  TestRoundtrip(0.123456e50);
-  TestRoundtrip(0.1234567e50);
-  TestRoundtrip(0.12345678e50);
-  TestRoundtrip(0.123456789e50);
-  TestRoundtrip(0.1234567891e50);
-  TestRoundtrip(0.12345678912e50);
-  TestRoundtrip(0.123456789123e50);
-  TestRoundtrip(0.1234567891234e50);
-  TestRoundtrip(0.12345678912345e50);
-  TestRoundtrip(0.123456789123456e50);
-  TestRoundtrip(0.1234567891234567e50);
-  TestRoundtrip(0.12345678912345678e50);
-
-  TestRoundtrip(0.1e-50);
-  TestRoundtrip(0.12e-50);
-  TestRoundtrip(0.123e-50);
-  TestRoundtrip(0.1234e-50);
-  TestRoundtrip(0.12345e-50);
-  TestRoundtrip(0.123456e-50);
-  TestRoundtrip(0.1234567e-50);
-  TestRoundtrip(0.12345678e-50);
-  TestRoundtrip(0.123456789e-50);
-  TestRoundtrip(0.1234567891e-50);
-  TestRoundtrip(0.12345678912e-50);
-  TestRoundtrip(0.123456789123e-50);
-  TestRoundtrip(0.1234567891234e-50);
-  TestRoundtrip(0.12345678912345e-50);
-  TestRoundtrip(0.123456789123456e-50);
-  TestRoundtrip(0.1234567891234567e-50);
-  TestRoundtrip(0.12345678912345678e-50);
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/flags/parse.cc b/third_party/abseil_cpp/absl/flags/parse.cc
deleted file mode 100644
index dd1a6796cabd..000000000000
--- a/third_party/abseil_cpp/absl/flags/parse.cc
+++ /dev/null
@@ -1,823 +0,0 @@
-//
-// Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/parse.h"
-
-#include <stdlib.h>
-
-#include <algorithm>
-#include <fstream>
-#include <iostream>
-#include <iterator>
-#include <string>
-#include <tuple>
-#include <utility>
-#include <vector>
-
-#ifdef _WIN32
-#include <windows.h>
-#endif
-
-#include "absl/base/attributes.h"
-#include "absl/base/config.h"
-#include "absl/base/const_init.h"
-#include "absl/base/thread_annotations.h"
-#include "absl/flags/commandlineflag.h"
-#include "absl/flags/config.h"
-#include "absl/flags/flag.h"
-#include "absl/flags/internal/commandlineflag.h"
-#include "absl/flags/internal/flag.h"
-#include "absl/flags/internal/parse.h"
-#include "absl/flags/internal/private_handle_accessor.h"
-#include "absl/flags/internal/program_name.h"
-#include "absl/flags/internal/usage.h"
-#include "absl/flags/reflection.h"
-#include "absl/flags/usage.h"
-#include "absl/flags/usage_config.h"
-#include "absl/strings/ascii.h"
-#include "absl/strings/str_cat.h"
-#include "absl/strings/string_view.h"
-#include "absl/strings/strip.h"
-#include "absl/synchronization/mutex.h"
-
-// --------------------------------------------------------------------
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-namespace {
-
-ABSL_CONST_INIT absl::Mutex processing_checks_guard(absl::kConstInit);
-
-ABSL_CONST_INIT bool flagfile_needs_processing
-    ABSL_GUARDED_BY(processing_checks_guard) = false;
-ABSL_CONST_INIT bool fromenv_needs_processing
-    ABSL_GUARDED_BY(processing_checks_guard) = false;
-ABSL_CONST_INIT bool tryfromenv_needs_processing
-    ABSL_GUARDED_BY(processing_checks_guard) = false;
-
-ABSL_CONST_INIT absl::Mutex specified_flags_guard(absl::kConstInit);
-ABSL_CONST_INIT std::vector<const CommandLineFlag*>* specified_flags
-    ABSL_GUARDED_BY(specified_flags_guard) = nullptr;
-
-struct SpecifiedFlagsCompare {
-  bool operator()(const CommandLineFlag* a, const CommandLineFlag* b) const {
-    return a->Name() < b->Name();
-  }
-  bool operator()(const CommandLineFlag* a, absl::string_view b) const {
-    return a->Name() < b;
-  }
-  bool operator()(absl::string_view a, const CommandLineFlag* b) const {
-    return a < b->Name();
-  }
-};
-
-}  // namespace
-}  // namespace flags_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-ABSL_FLAG(std::vector<std::string>, flagfile, {},
-          "comma-separated list of files to load flags from")
-    .OnUpdate([]() {
-      if (absl::GetFlag(FLAGS_flagfile).empty()) return;
-
-      absl::MutexLock l(&absl::flags_internal::processing_checks_guard);
-
-      // Setting this flag twice before it is handled most likely an internal
-      // error and should be reviewed by developers.
-      if (absl::flags_internal::flagfile_needs_processing) {
-        ABSL_INTERNAL_LOG(WARNING, "flagfile set twice before it is handled");
-      }
-
-      absl::flags_internal::flagfile_needs_processing = true;
-    });
-ABSL_FLAG(std::vector<std::string>, fromenv, {},
-          "comma-separated list of flags to set from the environment"
-          " [use 'export FLAGS_flag1=value']")
-    .OnUpdate([]() {
-      if (absl::GetFlag(FLAGS_fromenv).empty()) return;
-
-      absl::MutexLock l(&absl::flags_internal::processing_checks_guard);
-
-      // Setting this flag twice before it is handled most likely an internal
-      // error and should be reviewed by developers.
-      if (absl::flags_internal::fromenv_needs_processing) {
-        ABSL_INTERNAL_LOG(WARNING, "fromenv set twice before it is handled.");
-      }
-
-      absl::flags_internal::fromenv_needs_processing = true;
-    });
-ABSL_FLAG(std::vector<std::string>, tryfromenv, {},
-          "comma-separated list of flags to try to set from the environment if "
-          "present")
-    .OnUpdate([]() {
-      if (absl::GetFlag(FLAGS_tryfromenv).empty()) return;
-
-      absl::MutexLock l(&absl::flags_internal::processing_checks_guard);
-
-      // Setting this flag twice before it is handled most likely an internal
-      // error and should be reviewed by developers.
-      if (absl::flags_internal::tryfromenv_needs_processing) {
-        ABSL_INTERNAL_LOG(WARNING,
-                          "tryfromenv set twice before it is handled.");
-      }
-
-      absl::flags_internal::tryfromenv_needs_processing = true;
-    });
-
-ABSL_FLAG(std::vector<std::string>, undefok, {},
-          "comma-separated list of flag names that it is okay to specify "
-          "on the command line even if the program does not define a flag "
-          "with that name");
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-
-namespace {
-
-class ArgsList {
- public:
-  ArgsList() : next_arg_(0) {}
-  ArgsList(int argc, char* argv[]) : args_(argv, argv + argc), next_arg_(0) {}
-  explicit ArgsList(const std::vector<std::string>& args)
-      : args_(args), next_arg_(0) {}
-
-  // Returns success status: true if parsing successful, false otherwise.
-  bool ReadFromFlagfile(const std::string& flag_file_name);
-
-  int Size() const { return args_.size() - next_arg_; }
-  int FrontIndex() const { return next_arg_; }
-  absl::string_view Front() const { return args_[next_arg_]; }
-  void PopFront() { next_arg_++; }
-
- private:
-  std::vector<std::string> args_;
-  int next_arg_;
-};
-
-bool ArgsList::ReadFromFlagfile(const std::string& flag_file_name) {
-  std::ifstream flag_file(flag_file_name);
-
-  if (!flag_file) {
-    flags_internal::ReportUsageError(
-        absl::StrCat("Can't open flagfile ", flag_file_name), true);
-
-    return false;
-  }
-
-  // This argument represents fake argv[0], which should be present in all arg
-  // lists.
-  args_.push_back("");
-
-  std::string line;
-  bool success = true;
-
-  while (std::getline(flag_file, line)) {
-    absl::string_view stripped = absl::StripLeadingAsciiWhitespace(line);
-
-    if (stripped.empty() || stripped[0] == '#') {
-      // Comment or empty line; just ignore.
-      continue;
-    }
-
-    if (stripped[0] == '-') {
-      if (stripped == "--") {
-        flags_internal::ReportUsageError(
-            "Flagfile can't contain position arguments or --", true);
-
-        success = false;
-        break;
-      }
-
-      args_.push_back(std::string(stripped));
-      continue;
-    }
-
-    flags_internal::ReportUsageError(
-        absl::StrCat("Unexpected line in the flagfile ", flag_file_name, ": ",
-                     line),
-        true);
-
-    success = false;
-  }
-
-  return success;
-}
-
-// --------------------------------------------------------------------
-
-// Reads the environment variable with name `name` and stores results in
-// `value`. If variable is not present in environment returns false, otherwise
-// returns true.
-bool GetEnvVar(const char* var_name, std::string& var_value) {
-#ifdef _WIN32
-  char buf[1024];
-  auto get_res = GetEnvironmentVariableA(var_name, buf, sizeof(buf));
-  if (get_res >= sizeof(buf)) {
-    return false;
-  }
-
-  if (get_res == 0) {
-    return false;
-  }
-
-  var_value = std::string(buf, get_res);
-#else
-  const char* val = ::getenv(var_name);
-  if (val == nullptr) {
-    return false;
-  }
-
-  var_value = val;
-#endif
-
-  return true;
-}
-
-// --------------------------------------------------------------------
-
-// Returns:
-//  Flag name or empty if arg= --
-//  Flag value after = in --flag=value (empty if --foo)
-//  "Is empty value" status. True if arg= --foo=, false otherwise. This is
-//  required to separate --foo from --foo=.
-// For example:
-//      arg           return values
-//   "--foo=bar" -> {"foo", "bar", false}.
-//   "--foo"     -> {"foo", "", false}.
-//   "--foo="    -> {"foo", "", true}.
-std::tuple<absl::string_view, absl::string_view, bool> SplitNameAndValue(
-    absl::string_view arg) {
-  // Allow -foo and --foo
-  absl::ConsumePrefix(&arg, "-");
-
-  if (arg.empty()) {
-    return std::make_tuple("", "", false);
-  }
-
-  auto equal_sign_pos = arg.find("=");
-
-  absl::string_view flag_name = arg.substr(0, equal_sign_pos);
-
-  absl::string_view value;
-  bool is_empty_value = false;
-
-  if (equal_sign_pos != absl::string_view::npos) {
-    value = arg.substr(equal_sign_pos + 1);
-    is_empty_value = value.empty();
-  }
-
-  return std::make_tuple(flag_name, value, is_empty_value);
-}
-
-// --------------------------------------------------------------------
-
-// Returns:
-//  found flag or nullptr
-//  is negative in case of --nofoo
-std::tuple<CommandLineFlag*, bool> LocateFlag(absl::string_view flag_name) {
-  CommandLineFlag* flag = absl::FindCommandLineFlag(flag_name);
-  bool is_negative = false;
-
-  if (!flag && absl::ConsumePrefix(&flag_name, "no")) {
-    flag = absl::FindCommandLineFlag(flag_name);
-    is_negative = true;
-  }
-
-  return std::make_tuple(flag, is_negative);
-}
-
-// --------------------------------------------------------------------
-
-// Verify that default values of typed flags must be convertible to string and
-// back.
-void CheckDefaultValuesParsingRoundtrip() {
-#ifndef NDEBUG
-  flags_internal::ForEachFlag([&](CommandLineFlag& flag) {
-    if (flag.IsRetired()) return;
-
-#define ABSL_FLAGS_INTERNAL_IGNORE_TYPE(T, _) \
-  if (flag.IsOfType<T>()) return;
-
-    ABSL_FLAGS_INTERNAL_SUPPORTED_TYPES(ABSL_FLAGS_INTERNAL_IGNORE_TYPE)
-#undef ABSL_FLAGS_INTERNAL_IGNORE_TYPE
-
-    flags_internal::PrivateHandleAccessor::CheckDefaultValueParsingRoundtrip(
-        flag);
-  });
-#endif
-}
-
-// --------------------------------------------------------------------
-
-// Returns success status, which is true if we successfully read all flag files,
-// in which case new ArgLists are appended to the input_args in a reverse order
-// of file names in the input flagfiles list. This order ensures that flags from
-// the first flagfile in the input list are processed before the second flagfile
-// etc.
-bool ReadFlagfiles(const std::vector<std::string>& flagfiles,
-                   std::vector<ArgsList>& input_args) {
-  bool success = true;
-  for (auto it = flagfiles.rbegin(); it != flagfiles.rend(); ++it) {
-    ArgsList al;
-
-    if (al.ReadFromFlagfile(*it)) {
-      input_args.push_back(al);
-    } else {
-      success = false;
-    }
-  }
-
-  return success;
-}
-
-// Returns success status, which is true if were able to locate all environment
-// variables correctly or if fail_on_absent_in_env is false. The environment
-// variable names are expected to be of the form `FLAGS_<flag_name>`, where
-// `flag_name` is a string from the input flag_names list. If successful we
-// append a single ArgList at the end of the input_args.
-bool ReadFlagsFromEnv(const std::vector<std::string>& flag_names,
-                      std::vector<ArgsList>& input_args,
-                      bool fail_on_absent_in_env) {
-  bool success = true;
-  std::vector<std::string> args;
-
-  // This argument represents fake argv[0], which should be present in all arg
-  // lists.
-  args.push_back("");
-
-  for (const auto& flag_name : flag_names) {
-    // Avoid infinite recursion.
-    if (flag_name == "fromenv" || flag_name == "tryfromenv") {
-      flags_internal::ReportUsageError(
-          absl::StrCat("Infinite recursion on flag ", flag_name), true);
-
-      success = false;
-      continue;
-    }
-
-    const std::string envname = absl::StrCat("FLAGS_", flag_name);
-    std::string envval;
-    if (!GetEnvVar(envname.c_str(), envval)) {
-      if (fail_on_absent_in_env) {
-        flags_internal::ReportUsageError(
-            absl::StrCat(envname, " not found in environment"), true);
-
-        success = false;
-      }
-
-      continue;
-    }
-
-    args.push_back(absl::StrCat("--", flag_name, "=", envval));
-  }
-
-  if (success) {
-    input_args.emplace_back(args);
-  }
-
-  return success;
-}
-
-// --------------------------------------------------------------------
-
-// Returns success status, which is true if were able to handle all generator
-// flags (flagfile, fromenv, tryfromemv) successfully.
-bool HandleGeneratorFlags(std::vector<ArgsList>& input_args,
-                          std::vector<std::string>& flagfile_value) {
-  bool success = true;
-
-  absl::MutexLock l(&flags_internal::processing_checks_guard);
-
-  // flagfile could have been set either on a command line or
-  // programmatically before invoking ParseCommandLine. Note that we do not
-  // actually process arguments specified in the flagfile, but instead
-  // create a secondary arguments list to be processed along with the rest
-  // of the comamnd line arguments. Since we always the process most recently
-  // created list of arguments first, this will result in flagfile argument
-  // being processed before any other argument in the command line. If
-  // FLAGS_flagfile contains more than one file name we create multiple new
-  // levels of arguments in a reverse order of file names. Thus we always
-  // process arguments from first file before arguments containing in a
-  // second file, etc. If flagfile contains another
-  // --flagfile inside of it, it will produce new level of arguments and
-  // processed before the rest of the flagfile. We are also collecting all
-  // flagfiles set on original command line. Unlike the rest of the flags,
-  // this flag can be set multiple times and is expected to be handled
-  // multiple times. We are collecting them all into a single list and set
-  // the value of FLAGS_flagfile to that value at the end of the parsing.
-  if (flags_internal::flagfile_needs_processing) {
-    auto flagfiles = absl::GetFlag(FLAGS_flagfile);
-
-    if (input_args.size() == 1) {
-      flagfile_value.insert(flagfile_value.end(), flagfiles.begin(),
-                            flagfiles.end());
-    }
-
-    success &= ReadFlagfiles(flagfiles, input_args);
-
-    flags_internal::flagfile_needs_processing = false;
-  }
-
-  // Similar to flagfile fromenv/tryfromemv can be set both
-  // programmatically and at runtime on a command line. Unlike flagfile these
-  // can't be recursive.
-  if (flags_internal::fromenv_needs_processing) {
-    auto flags_list = absl::GetFlag(FLAGS_fromenv);
-
-    success &= ReadFlagsFromEnv(flags_list, input_args, true);
-
-    flags_internal::fromenv_needs_processing = false;
-  }
-
-  if (flags_internal::tryfromenv_needs_processing) {
-    auto flags_list = absl::GetFlag(FLAGS_tryfromenv);
-
-    success &= ReadFlagsFromEnv(flags_list, input_args, false);
-
-    flags_internal::tryfromenv_needs_processing = false;
-  }
-
-  return success;
-}
-
-// --------------------------------------------------------------------
-
-void ResetGeneratorFlags(const std::vector<std::string>& flagfile_value) {
-  // Setting flagfile to the value which collates all the values set on a
-  // command line and programmatically. So if command line looked like
-  // --flagfile=f1 --flagfile=f2 the final value of the FLAGS_flagfile flag is
-  // going to be {"f1", "f2"}
-  if (!flagfile_value.empty()) {
-    absl::SetFlag(&FLAGS_flagfile, flagfile_value);
-    absl::MutexLock l(&flags_internal::processing_checks_guard);
-    flags_internal::flagfile_needs_processing = false;
-  }
-
-  // fromenv/tryfromenv are set to <undefined> value.
-  if (!absl::GetFlag(FLAGS_fromenv).empty()) {
-    absl::SetFlag(&FLAGS_fromenv, {});
-  }
-  if (!absl::GetFlag(FLAGS_tryfromenv).empty()) {
-    absl::SetFlag(&FLAGS_tryfromenv, {});
-  }
-
-  absl::MutexLock l(&flags_internal::processing_checks_guard);
-  flags_internal::fromenv_needs_processing = false;
-  flags_internal::tryfromenv_needs_processing = false;
-}
-
-// --------------------------------------------------------------------
-
-// Returns:
-//  success status
-//  deduced value
-// We are also mutating curr_list in case if we need to get a hold of next
-// argument in the input.
-std::tuple<bool, absl::string_view> DeduceFlagValue(const CommandLineFlag& flag,
-                                                    absl::string_view value,
-                                                    bool is_negative,
-                                                    bool is_empty_value,
-                                                    ArgsList* curr_list) {
-  // Value is either an argument suffix after `=` in "--foo=<value>"
-  // or separate argument in case of "--foo" "<value>".
-
-  // boolean flags have these forms:
-  //   --foo
-  //   --nofoo
-  //   --foo=true
-  //   --foo=false
-  //   --nofoo=<value> is not supported
-  //   --foo <value> is not supported
-
-  // non boolean flags have these forms:
-  // --foo=<value>
-  // --foo <value>
-  // --nofoo is not supported
-
-  if (flag.IsOfType<bool>()) {
-    if (value.empty()) {
-      if (is_empty_value) {
-        // "--bool_flag=" case
-        flags_internal::ReportUsageError(
-            absl::StrCat(
-                "Missing the value after assignment for the boolean flag '",
-                flag.Name(), "'"),
-            true);
-        return std::make_tuple(false, "");
-      }
-
-      // "--bool_flag" case
-      value = is_negative ? "0" : "1";
-    } else if (is_negative) {
-      // "--nobool_flag=Y" case
-      flags_internal::ReportUsageError(
-          absl::StrCat("Negative form with assignment is not valid for the "
-                       "boolean flag '",
-                       flag.Name(), "'"),
-          true);
-      return std::make_tuple(false, "");
-    }
-  } else if (is_negative) {
-    // "--noint_flag=1" case
-    flags_internal::ReportUsageError(
-        absl::StrCat("Negative form is not valid for the flag '", flag.Name(),
-                     "'"),
-        true);
-    return std::make_tuple(false, "");
-  } else if (value.empty() && (!is_empty_value)) {
-    if (curr_list->Size() == 1) {
-      // "--int_flag" case
-      flags_internal::ReportUsageError(
-          absl::StrCat("Missing the value for the flag '", flag.Name(), "'"),
-          true);
-      return std::make_tuple(false, "");
-    }
-
-    // "--int_flag" "10" case
-    curr_list->PopFront();
-    value = curr_list->Front();
-
-    // Heuristic to detect the case where someone treats a string arg
-    // like a bool or just forgets to pass a value:
-    // --my_string_var --foo=bar
-    // We look for a flag of string type, whose value begins with a
-    // dash and corresponds to known flag or standalone --.
-    if (!value.empty() && value[0] == '-' && flag.IsOfType<std::string>()) {
-      auto maybe_flag_name = std::get<0>(SplitNameAndValue(value.substr(1)));
-
-      if (maybe_flag_name.empty() ||
-          std::get<0>(LocateFlag(maybe_flag_name)) != nullptr) {
-        // "--string_flag" "--known_flag" case
-        ABSL_INTERNAL_LOG(
-            WARNING,
-            absl::StrCat("Did you really mean to set flag '", flag.Name(),
-                         "' to the value '", value, "'?"));
-      }
-    }
-  }
-
-  return std::make_tuple(true, value);
-}
-
-// --------------------------------------------------------------------
-
-bool CanIgnoreUndefinedFlag(absl::string_view flag_name) {
-  auto undefok = absl::GetFlag(FLAGS_undefok);
-  if (std::find(undefok.begin(), undefok.end(), flag_name) != undefok.end()) {
-    return true;
-  }
-
-  if (absl::ConsumePrefix(&flag_name, "no") &&
-      std::find(undefok.begin(), undefok.end(), flag_name) != undefok.end()) {
-    return true;
-  }
-
-  return false;
-}
-
-}  // namespace
-
-// --------------------------------------------------------------------
-
-bool WasPresentOnCommandLine(absl::string_view flag_name) {
-  absl::MutexLock l(&specified_flags_guard);
-  ABSL_INTERNAL_CHECK(specified_flags != nullptr,
-                      "ParseCommandLine is not invoked yet");
-
-  return std::binary_search(specified_flags->begin(), specified_flags->end(),
-                            flag_name, SpecifiedFlagsCompare{});
-}
-
-// --------------------------------------------------------------------
-
-std::vector<char*> ParseCommandLineImpl(int argc, char* argv[],
-                                        ArgvListAction arg_list_act,
-                                        UsageFlagsAction usage_flag_act,
-                                        OnUndefinedFlag on_undef_flag) {
-  ABSL_INTERNAL_CHECK(argc > 0, "Missing argv[0]");
-
-  // Once parsing has started we will not have more flag registrations.
-  // If we did, they would be missing during parsing, which is a problem on
-  // itself.
-  flags_internal::FinalizeRegistry();
-
-  // This routine does not return anything since we abort on failure.
-  CheckDefaultValuesParsingRoundtrip();
-
-  std::vector<std::string> flagfile_value;
-
-  std::vector<ArgsList> input_args;
-  input_args.push_back(ArgsList(argc, argv));
-
-  std::vector<char*> output_args;
-  std::vector<char*> positional_args;
-  output_args.reserve(argc);
-
-  // This is the list of undefined flags. The element of the list is the pair
-  // consisting of boolean indicating if flag came from command line (vs from
-  // some flag file we've read) and flag name.
-  // TODO(rogeeff): Eliminate the first element in the pair after cleanup.
-  std::vector<std::pair<bool, std::string>> undefined_flag_names;
-
-  // Set program invocation name if it is not set before.
-  if (ProgramInvocationName() == "UNKNOWN") {
-    flags_internal::SetProgramInvocationName(argv[0]);
-  }
-  output_args.push_back(argv[0]);
-
-  absl::MutexLock l(&specified_flags_guard);
-  if (specified_flags == nullptr) {
-    specified_flags = new std::vector<const CommandLineFlag*>;
-  } else {
-    specified_flags->clear();
-  }
-
-  // Iterate through the list of the input arguments. First level are arguments
-  // originated from argc/argv. Following levels are arguments originated from
-  // recursive parsing of flagfile(s).
-  bool success = true;
-  while (!input_args.empty()) {
-    // 10. First we process the built-in generator flags.
-    success &= HandleGeneratorFlags(input_args, flagfile_value);
-
-    // 30. Select top-most (most recent) arguments list. If it is empty drop it
-    // and re-try.
-    ArgsList& curr_list = input_args.back();
-
-    curr_list.PopFront();
-
-    if (curr_list.Size() == 0) {
-      input_args.pop_back();
-      continue;
-    }
-
-    // 40. Pick up the front remaining argument in the current list. If current
-    // stack of argument lists contains only one element - we are processing an
-    // argument from the original argv.
-    absl::string_view arg(curr_list.Front());
-    bool arg_from_argv = input_args.size() == 1;
-
-    // 50. If argument does not start with - or is just "-" - this is
-    // positional argument.
-    if (!absl::ConsumePrefix(&arg, "-") || arg.empty()) {
-      ABSL_INTERNAL_CHECK(arg_from_argv,
-                          "Flagfile cannot contain positional argument");
-
-      positional_args.push_back(argv[curr_list.FrontIndex()]);
-      continue;
-    }
-
-    if (arg_from_argv && (arg_list_act == ArgvListAction::kKeepParsedArgs)) {
-      output_args.push_back(argv[curr_list.FrontIndex()]);
-    }
-
-    // 60. Split the current argument on '=' to figure out the argument
-    // name and value. If flag name is empty it means we've got "--". value
-    // can be empty either if there were no '=' in argument string at all or
-    // an argument looked like "--foo=". In a latter case is_empty_value is
-    // true.
-    absl::string_view flag_name;
-    absl::string_view value;
-    bool is_empty_value = false;
-
-    std::tie(flag_name, value, is_empty_value) = SplitNameAndValue(arg);
-
-    // 70. "--" alone means what it does for GNU: stop flags parsing. We do
-    // not support positional arguments in flagfiles, so we just drop them.
-    if (flag_name.empty()) {
-      ABSL_INTERNAL_CHECK(arg_from_argv,
-                          "Flagfile cannot contain positional argument");
-
-      curr_list.PopFront();
-      break;
-    }
-
-    // 80. Locate the flag based on flag name. Handle both --foo and --nofoo
-    CommandLineFlag* flag = nullptr;
-    bool is_negative = false;
-    std::tie(flag, is_negative) = LocateFlag(flag_name);
-
-    if (flag == nullptr) {
-      // Usage flags are not modeled as Abseil flags. Locate them separately.
-      if (flags_internal::DeduceUsageFlags(flag_name, value)) {
-        continue;
-      }
-
-      if (on_undef_flag != OnUndefinedFlag::kIgnoreUndefined) {
-        undefined_flag_names.emplace_back(arg_from_argv,
-                                          std::string(flag_name));
-      }
-      continue;
-    }
-
-    // 90. Deduce flag's value (from this or next argument)
-    auto curr_index = curr_list.FrontIndex();
-    bool value_success = true;
-    std::tie(value_success, value) =
-        DeduceFlagValue(*flag, value, is_negative, is_empty_value, &curr_list);
-    success &= value_success;
-
-    // If above call consumed an argument, it was a standalone value
-    if (arg_from_argv && (arg_list_act == ArgvListAction::kKeepParsedArgs) &&
-        (curr_index != curr_list.FrontIndex())) {
-      output_args.push_back(argv[curr_list.FrontIndex()]);
-    }
-
-    // 100. Set the located flag to a new new value, unless it is retired.
-    // Setting retired flag fails, but we ignoring it here while also reporting
-    // access to retired flag.
-    std::string error;
-    if (!flags_internal::PrivateHandleAccessor::ParseFrom(
-            *flag, value, SET_FLAGS_VALUE, kCommandLine, error)) {
-      if (flag->IsRetired()) continue;
-
-      flags_internal::ReportUsageError(error, true);
-      success = false;
-    } else {
-      specified_flags->push_back(flag);
-    }
-  }
-
-  for (const auto& flag_name : undefined_flag_names) {
-    if (CanIgnoreUndefinedFlag(flag_name.second)) continue;
-
-    flags_internal::ReportUsageError(
-        absl::StrCat("Unknown command line flag '", flag_name.second, "'"),
-        true);
-
-    success = false;
-  }
-
-#if ABSL_FLAGS_STRIP_NAMES
-  if (!success) {
-    flags_internal::ReportUsageError(
-        "NOTE: command line flags are disabled in this build", true);
-  }
-#endif
-
-  if (!success) {
-    flags_internal::HandleUsageFlags(std::cout,
-                                     ProgramUsageMessage());
-    std::exit(1);
-  }
-
-  if (usage_flag_act == UsageFlagsAction::kHandleUsage) {
-    int exit_code = flags_internal::HandleUsageFlags(
-        std::cout, ProgramUsageMessage());
-
-    if (exit_code != -1) {
-      std::exit(exit_code);
-    }
-  }
-
-  ResetGeneratorFlags(flagfile_value);
-
-  // Reinstate positional args which were intermixed with flags in the arguments
-  // list.
-  for (auto arg : positional_args) {
-    output_args.push_back(arg);
-  }
-
-  // All the remaining arguments are positional.
-  if (!input_args.empty()) {
-    for (int arg_index = input_args.back().FrontIndex(); arg_index < argc;
-         ++arg_index) {
-      output_args.push_back(argv[arg_index]);
-    }
-  }
-
-  // Trim and sort the vector.
-  specified_flags->shrink_to_fit();
-  std::sort(specified_flags->begin(), specified_flags->end(),
-            SpecifiedFlagsCompare{});
-  return output_args;
-}
-
-}  // namespace flags_internal
-
-// --------------------------------------------------------------------
-
-std::vector<char*> ParseCommandLine(int argc, char* argv[]) {
-  return flags_internal::ParseCommandLineImpl(
-      argc, argv, flags_internal::ArgvListAction::kRemoveParsedArgs,
-      flags_internal::UsageFlagsAction::kHandleUsage,
-      flags_internal::OnUndefinedFlag::kAbortIfUndefined);
-}
-
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/flags/parse.h b/third_party/abseil_cpp/absl/flags/parse.h
deleted file mode 100644
index 929de2cb40de..000000000000
--- a/third_party/abseil_cpp/absl/flags/parse.h
+++ /dev/null
@@ -1,60 +0,0 @@
-//
-// Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-// -----------------------------------------------------------------------------
-// File: parse.h
-// -----------------------------------------------------------------------------
-//
-// This file defines the main parsing function for Abseil flags:
-// `absl::ParseCommandLine()`.
-
-#ifndef ABSL_FLAGS_PARSE_H_
-#define ABSL_FLAGS_PARSE_H_
-
-#include <vector>
-
-#include "absl/base/config.h"
-#include "absl/flags/internal/parse.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-
-// ParseCommandLine()
-//
-// Parses the set of command-line arguments passed in the `argc` (argument
-// count) and `argv[]` (argument vector) parameters from `main()`, assigning
-// values to any defined Abseil flags. (Any arguments passed after the
-// flag-terminating delimiter (`--`) are treated as positional arguments and
-// ignored.)
-//
-// Any command-line flags (and arguments to those flags) are parsed into Abseil
-// Flag values, if those flags are defined. Any undefined flags will either
-// return an error, or be ignored if that flag is designated using `undefok` to
-// indicate "undefined is OK."
-//
-// Any command-line positional arguments not part of any command-line flag (or
-// arguments to a flag) are returned in a vector, with the program invocation
-// name at position 0 of that vector. (Note that this includes positional
-// arguments after the flag-terminating delimiter `--`.)
-//
-// After all flags and flag arguments are parsed, this function looks for any
-// built-in usage flags (e.g. `--help`), and if any were specified, it reports
-// help messages and then exits the program.
-std::vector<char*> ParseCommandLine(int argc, char* argv[]);
-
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_FLAGS_PARSE_H_
diff --git a/third_party/abseil_cpp/absl/flags/parse_test.cc b/third_party/abseil_cpp/absl/flags/parse_test.cc
deleted file mode 100644
index 41bc0bc6b3a4..000000000000
--- a/third_party/abseil_cpp/absl/flags/parse_test.cc
+++ /dev/null
@@ -1,929 +0,0 @@
-//
-// Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/parse.h"
-
-#include <stdlib.h>
-
-#include <fstream>
-#include <string>
-#include <vector>
-
-#include "gmock/gmock.h"
-#include "gtest/gtest.h"
-#include "absl/base/internal/raw_logging.h"
-#include "absl/base/internal/scoped_set_env.h"
-#include "absl/flags/declare.h"
-#include "absl/flags/flag.h"
-#include "absl/flags/internal/parse.h"
-#include "absl/flags/internal/usage.h"
-#include "absl/flags/reflection.h"
-#include "absl/strings/str_cat.h"
-#include "absl/strings/string_view.h"
-#include "absl/strings/substitute.h"
-#include "absl/types/span.h"
-
-#ifdef _WIN32
-#include <windows.h>
-#endif
-
-namespace {
-
-using absl::base_internal::ScopedSetEnv;
-
-struct UDT {
-  UDT() = default;
-  UDT(const UDT&) = default;
-  UDT(int v) : value(v) {}  // NOLINT
-
-  int value;
-};
-
-bool AbslParseFlag(absl::string_view in, UDT* udt, std::string* err) {
-  if (in == "A") {
-    udt->value = 1;
-    return true;
-  }
-  if (in == "AAA") {
-    udt->value = 10;
-    return true;
-  }
-
-  *err = "Use values A, AAA instead";
-  return false;
-}
-std::string AbslUnparseFlag(const UDT& udt) {
-  return udt.value == 1 ? "A" : "AAA";
-}
-
-std::string GetTestTmpDirEnvVar(const char* const env_var_name) {
-#ifdef _WIN32
-  char buf[MAX_PATH];
-  auto get_res = GetEnvironmentVariableA(env_var_name, buf, sizeof(buf));
-  if (get_res >= sizeof(buf) || get_res == 0) {
-    return "";
-  }
-
-  return std::string(buf, get_res);
-#else
-  const char* val = ::getenv(env_var_name);
-  if (val == nullptr) {
-    return "";
-  }
-
-  return val;
-#endif
-}
-
-const std::string& GetTestTempDir() {
-  static std::string* temp_dir_name = []() -> std::string* {
-    std::string* res = new std::string(GetTestTmpDirEnvVar("TEST_TMPDIR"));
-
-    if (res->empty()) {
-      *res = GetTestTmpDirEnvVar("TMPDIR");
-    }
-
-    if (res->empty()) {
-#ifdef _WIN32
-      char temp_path_buffer[MAX_PATH];
-
-      auto len = GetTempPathA(MAX_PATH, temp_path_buffer);
-      if (len < MAX_PATH && len != 0) {
-        std::string temp_dir_name = temp_path_buffer;
-        if (!absl::EndsWith(temp_dir_name, "\\")) {
-          temp_dir_name.push_back('\\');
-        }
-        absl::StrAppend(&temp_dir_name, "parse_test.", GetCurrentProcessId());
-        if (CreateDirectoryA(temp_dir_name.c_str(), nullptr)) {
-          *res = temp_dir_name;
-        }
-      }
-#else
-      char temp_dir_template[] = "/tmp/parse_test.XXXXXX";
-      if (auto* unique_name = ::mkdtemp(temp_dir_template)) {
-        *res = unique_name;
-      }
-#endif
-    }
-
-    if (res->empty()) {
-      ABSL_INTERNAL_LOG(FATAL,
-                        "Failed to make temporary directory for data files");
-    }
-
-#ifdef _WIN32
-    *res += "\\";
-#else
-    *res += "/";
-#endif
-
-    return res;
-  }();
-
-  return *temp_dir_name;
-}
-
-struct FlagfileData {
-  const absl::string_view file_name;
-  const absl::Span<const char* const> file_lines;
-};
-
-// clang-format off
-constexpr const char* const ff1_data[] = {
-    "# comment    ",
-    "  # comment  ",
-    "",
-    "     ",
-    "--int_flag=-1",
-    "  --string_flag=q2w2  ",
-    "  ##   ",
-    "  --double_flag=0.1",
-    "--bool_flag=Y  "
-};
-
-constexpr const char* const ff2_data[] = {
-    "# Setting legacy flag",
-    "--legacy_int=1111",
-    "--legacy_bool",
-    "--nobool_flag",
-    "--legacy_str=aqsw",
-    "--int_flag=100",
-    "   ## ============="
-};
-// clang-format on
-
-// Builds flagfile flag in the flagfile_flag buffer and returns it. This
-// function also creates a temporary flagfile based on FlagfileData input.
-// We create a flagfile in a temporary directory with the name specified in
-// FlagfileData and populate it with lines specifed in FlagfileData. If $0 is
-// referenced in any of the lines in FlagfileData they are replaced with
-// temporary directory location. This way we can test inclusion of one flagfile
-// from another flagfile.
-const char* GetFlagfileFlag(const std::vector<FlagfileData>& ffd,
-                            std::string& flagfile_flag) {
-  flagfile_flag = "--flagfile=";
-  absl::string_view separator;
-  for (const auto& flagfile_data : ffd) {
-    std::string flagfile_name =
-        absl::StrCat(GetTestTempDir(), flagfile_data.file_name);
-
-    std::ofstream flagfile_out(flagfile_name);
-    for (auto line : flagfile_data.file_lines) {
-      flagfile_out << absl::Substitute(line, GetTestTempDir()) << "\n";
-    }
-
-    absl::StrAppend(&flagfile_flag, separator, flagfile_name);
-    separator = ",";
-  }
-
-  return flagfile_flag.c_str();
-}
-
-}  // namespace
-
-ABSL_FLAG(int, int_flag, 1, "");
-ABSL_FLAG(double, double_flag, 1.1, "");
-ABSL_FLAG(std::string, string_flag, "a", "");
-ABSL_FLAG(bool, bool_flag, false, "");
-ABSL_FLAG(UDT, udt_flag, -1, "");
-ABSL_RETIRED_FLAG(int, legacy_int, 1, "");
-ABSL_RETIRED_FLAG(bool, legacy_bool, false, "");
-ABSL_RETIRED_FLAG(std::string, legacy_str, "l", "");
-
-namespace {
-
-namespace flags = absl::flags_internal;
-using testing::ElementsAreArray;
-
-class ParseTest : public testing::Test {
- public:
-  ~ParseTest() override { flags::SetFlagsHelpMode(flags::HelpMode::kNone); }
-
- private:
-  absl::FlagSaver flag_saver_;
-};
-
-// --------------------------------------------------------------------
-
-template <int N>
-std::vector<char*> InvokeParse(const char* (&in_argv)[N]) {
-  return absl::ParseCommandLine(N, const_cast<char**>(in_argv));
-}
-
-// --------------------------------------------------------------------
-
-template <int N>
-void TestParse(const char* (&in_argv)[N], int int_flag_value,
-               double double_flag_val, absl::string_view string_flag_val,
-               bool bool_flag_val, int exp_position_args = 0) {
-  auto out_args = InvokeParse(in_argv);
-
-  EXPECT_EQ(out_args.size(), 1 + exp_position_args);
-  EXPECT_STREQ(out_args[0], "testbin");
-
-  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), int_flag_value);
-  EXPECT_NEAR(absl::GetFlag(FLAGS_double_flag), double_flag_val, 0.0001);
-  EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), string_flag_val);
-  EXPECT_EQ(absl::GetFlag(FLAGS_bool_flag), bool_flag_val);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseTest, TestEmptyArgv) {
-  const char* in_argv[] = {"testbin"};
-
-  auto out_args = InvokeParse(in_argv);
-
-  EXPECT_EQ(out_args.size(), 1);
-  EXPECT_STREQ(out_args[0], "testbin");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseTest, TestValidIntArg) {
-  const char* in_args1[] = {
-      "testbin",
-      "--int_flag=10",
-  };
-  TestParse(in_args1, 10, 1.1, "a", false);
-
-  const char* in_args2[] = {
-      "testbin",
-      "-int_flag=020",
-  };
-  TestParse(in_args2, 20, 1.1, "a", false);
-
-  const char* in_args3[] = {
-      "testbin",
-      "--int_flag",
-      "-30",
-  };
-  TestParse(in_args3, -30, 1.1, "a", false);
-
-  const char* in_args4[] = {
-      "testbin",
-      "-int_flag",
-      "0x21",
-  };
-  TestParse(in_args4, 33, 1.1, "a", false);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseTest, TestValidDoubleArg) {
-  const char* in_args1[] = {
-      "testbin",
-      "--double_flag=2.3",
-  };
-  TestParse(in_args1, 1, 2.3, "a", false);
-
-  const char* in_args2[] = {
-      "testbin",
-      "--double_flag=0x1.2",
-  };
-  TestParse(in_args2, 1, 1.125, "a", false);
-
-  const char* in_args3[] = {
-      "testbin",
-      "--double_flag",
-      "99.7",
-  };
-  TestParse(in_args3, 1, 99.7, "a", false);
-
-  const char* in_args4[] = {
-      "testbin",
-      "--double_flag",
-      "0x20.1",
-  };
-  TestParse(in_args4, 1, 32.0625, "a", false);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseTest, TestValidStringArg) {
-  const char* in_args1[] = {
-      "testbin",
-      "--string_flag=aqswde",
-  };
-  TestParse(in_args1, 1, 1.1, "aqswde", false);
-
-  const char* in_args2[] = {
-      "testbin",
-      "-string_flag=a=b=c",
-  };
-  TestParse(in_args2, 1, 1.1, "a=b=c", false);
-
-  const char* in_args3[] = {
-      "testbin",
-      "--string_flag",
-      "zaxscd",
-  };
-  TestParse(in_args3, 1, 1.1, "zaxscd", false);
-
-  const char* in_args4[] = {
-      "testbin",
-      "-string_flag",
-      "--int_flag",
-  };
-  TestParse(in_args4, 1, 1.1, "--int_flag", false);
-
-  const char* in_args5[] = {
-      "testbin",
-      "--string_flag",
-      "--no_a_flag=11",
-  };
-  TestParse(in_args5, 1, 1.1, "--no_a_flag=11", false);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseTest, TestValidBoolArg) {
-  const char* in_args1[] = {
-      "testbin",
-      "--bool_flag",
-  };
-  TestParse(in_args1, 1, 1.1, "a", true);
-
-  const char* in_args2[] = {
-      "testbin",
-      "--nobool_flag",
-  };
-  TestParse(in_args2, 1, 1.1, "a", false);
-
-  const char* in_args3[] = {
-      "testbin",
-      "--bool_flag=true",
-  };
-  TestParse(in_args3, 1, 1.1, "a", true);
-
-  const char* in_args4[] = {
-      "testbin",
-      "-bool_flag=false",
-  };
-  TestParse(in_args4, 1, 1.1, "a", false);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseTest, TestValidUDTArg) {
-  const char* in_args1[] = {
-      "testbin",
-      "--udt_flag=A",
-  };
-  InvokeParse(in_args1);
-
-  EXPECT_EQ(absl::GetFlag(FLAGS_udt_flag).value, 1);
-
-  const char* in_args2[] = {"testbin", "--udt_flag", "AAA"};
-  InvokeParse(in_args2);
-
-  EXPECT_EQ(absl::GetFlag(FLAGS_udt_flag).value, 10);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseTest, TestValidMultipleArg) {
-  const char* in_args1[] = {
-      "testbin",           "--bool_flag",       "--int_flag=2",
-      "--double_flag=0.1", "--string_flag=asd",
-  };
-  TestParse(in_args1, 2, 0.1, "asd", true);
-
-  const char* in_args2[] = {
-      "testbin", "--string_flag=", "--nobool_flag", "--int_flag",
-      "-011",    "--double_flag",  "-1e-2",
-  };
-  TestParse(in_args2, -11, -0.01, "", false);
-
-  const char* in_args3[] = {
-      "testbin",          "--int_flag",         "-0", "--string_flag", "\"\"",
-      "--bool_flag=true", "--double_flag=1e18",
-  };
-  TestParse(in_args3, 0, 1e18, "\"\"", true);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseTest, TestPositionalArgs) {
-  const char* in_args1[] = {
-      "testbin",
-      "p1",
-      "p2",
-  };
-  TestParse(in_args1, 1, 1.1, "a", false, 2);
-
-  auto out_args1 = InvokeParse(in_args1);
-
-  EXPECT_STREQ(out_args1[1], "p1");
-  EXPECT_STREQ(out_args1[2], "p2");
-
-  const char* in_args2[] = {
-      "testbin",
-      "--int_flag=2",
-      "p1",
-  };
-  TestParse(in_args2, 2, 1.1, "a", false, 1);
-
-  auto out_args2 = InvokeParse(in_args2);
-
-  EXPECT_STREQ(out_args2[1], "p1");
-
-  const char* in_args3[] = {"testbin", "p1",          "--int_flag=3",
-                            "p2",      "--bool_flag", "true"};
-  TestParse(in_args3, 3, 1.1, "a", true, 3);
-
-  auto out_args3 = InvokeParse(in_args3);
-
-  EXPECT_STREQ(out_args3[1], "p1");
-  EXPECT_STREQ(out_args3[2], "p2");
-  EXPECT_STREQ(out_args3[3], "true");
-
-  const char* in_args4[] = {
-      "testbin",
-      "--",
-      "p1",
-      "p2",
-  };
-  TestParse(in_args4, 3, 1.1, "a", true, 2);
-
-  auto out_args4 = InvokeParse(in_args4);
-
-  EXPECT_STREQ(out_args4[1], "p1");
-  EXPECT_STREQ(out_args4[2], "p2");
-
-  const char* in_args5[] = {
-      "testbin", "p1", "--int_flag=4", "--", "--bool_flag", "false", "p2",
-  };
-  TestParse(in_args5, 4, 1.1, "a", true, 4);
-
-  auto out_args5 = InvokeParse(in_args5);
-
-  EXPECT_STREQ(out_args5[1], "p1");
-  EXPECT_STREQ(out_args5[2], "--bool_flag");
-  EXPECT_STREQ(out_args5[3], "false");
-  EXPECT_STREQ(out_args5[4], "p2");
-}
-
-// --------------------------------------------------------------------
-
-using ParseDeathTest = ParseTest;
-
-TEST_F(ParseDeathTest, TestUndefinedArg) {
-  const char* in_args1[] = {
-      "testbin",
-      "--undefined_flag",
-  };
-  EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args1),
-                            "Unknown command line flag 'undefined_flag'");
-
-  const char* in_args2[] = {
-      "testbin",
-      "--noprefixed_flag",
-  };
-  EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args2),
-                            "Unknown command line flag 'noprefixed_flag'");
-
-  const char* in_args3[] = {
-      "testbin",
-      "--Int_flag=1",
-  };
-  EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args3),
-                            "Unknown command line flag 'Int_flag'");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseDeathTest, TestInvalidBoolFlagFormat) {
-  const char* in_args1[] = {
-      "testbin",
-      "--bool_flag=",
-  };
-  EXPECT_DEATH_IF_SUPPORTED(
-      InvokeParse(in_args1),
-      "Missing the value after assignment for the boolean flag 'bool_flag'");
-
-  const char* in_args2[] = {
-      "testbin",
-      "--nobool_flag=true",
-  };
-  EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args2),
-               "Negative form with assignment is not valid for the boolean "
-               "flag 'bool_flag'");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseDeathTest, TestInvalidNonBoolFlagFormat) {
-  const char* in_args1[] = {
-      "testbin",
-      "--nostring_flag",
-  };
-  EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args1),
-               "Negative form is not valid for the flag 'string_flag'");
-
-  const char* in_args2[] = {
-      "testbin",
-      "--int_flag",
-  };
-  EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args2),
-               "Missing the value for the flag 'int_flag'");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseDeathTest, TestInvalidUDTFlagFormat) {
-  const char* in_args1[] = {
-      "testbin",
-      "--udt_flag=1",
-  };
-  EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args1),
-               "Illegal value '1' specified for flag 'udt_flag'; Use values A, "
-               "AAA instead");
-
-  const char* in_args2[] = {
-      "testbin",
-      "--udt_flag",
-      "AA",
-  };
-  EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args2),
-               "Illegal value 'AA' specified for flag 'udt_flag'; Use values "
-               "A, AAA instead");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseTest, TestLegacyFlags) {
-  const char* in_args1[] = {
-      "testbin",
-      "--legacy_int=11",
-  };
-  TestParse(in_args1, 1, 1.1, "a", false);
-
-  const char* in_args2[] = {
-      "testbin",
-      "--legacy_bool",
-  };
-  TestParse(in_args2, 1, 1.1, "a", false);
-
-  const char* in_args3[] = {
-      "testbin",       "--legacy_int", "22",           "--int_flag=2",
-      "--legacy_bool", "true",         "--legacy_str", "--string_flag=qwe",
-  };
-  TestParse(in_args3, 2, 1.1, "a", false, 1);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseTest, TestSimpleValidFlagfile) {
-  std::string flagfile_flag;
-
-  const char* in_args1[] = {
-      "testbin",
-      GetFlagfileFlag({{"parse_test.ff1", absl::MakeConstSpan(ff1_data)}},
-                      flagfile_flag),
-  };
-  TestParse(in_args1, -1, 0.1, "q2w2  ", true);
-
-  const char* in_args2[] = {
-      "testbin",
-      GetFlagfileFlag({{"parse_test.ff2", absl::MakeConstSpan(ff2_data)}},
-                      flagfile_flag),
-  };
-  TestParse(in_args2, 100, 0.1, "q2w2  ", false);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseTest, TestValidMultiFlagfile) {
-  std::string flagfile_flag;
-
-  const char* in_args1[] = {
-      "testbin",
-      GetFlagfileFlag({{"parse_test.ff2", absl::MakeConstSpan(ff2_data)},
-                       {"parse_test.ff1", absl::MakeConstSpan(ff1_data)}},
-                      flagfile_flag),
-  };
-  TestParse(in_args1, -1, 0.1, "q2w2  ", true);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseTest, TestFlagfileMixedWithRegularFlags) {
-  std::string flagfile_flag;
-
-  const char* in_args1[] = {
-      "testbin", "--int_flag=3",
-      GetFlagfileFlag({{"parse_test.ff1", absl::MakeConstSpan(ff1_data)}},
-                      flagfile_flag),
-      "-double_flag=0.2"};
-  TestParse(in_args1, -1, 0.2, "q2w2  ", true);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseTest, TestFlagfileInFlagfile) {
-  std::string flagfile_flag;
-
-  constexpr const char* const ff3_data[] = {
-      "--flagfile=$0/parse_test.ff1",
-      "--flagfile=$0/parse_test.ff2",
-  };
-
-  GetFlagfileFlag({{"parse_test.ff2", absl::MakeConstSpan(ff2_data)},
-                   {"parse_test.ff1", absl::MakeConstSpan(ff1_data)}},
-                      flagfile_flag);
-
-  const char* in_args1[] = {
-      "testbin",
-      GetFlagfileFlag({{"parse_test.ff3", absl::MakeConstSpan(ff3_data)}},
-                      flagfile_flag),
-  };
-  TestParse(in_args1, 100, 0.1, "q2w2  ", false);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseDeathTest, TestInvalidFlagfiles) {
-  std::string flagfile_flag;
-
-  constexpr const char* const ff4_data[] = {
-    "--unknown_flag=10"
-  };
-
-  const char* in_args1[] = {
-      "testbin",
-      GetFlagfileFlag({{"parse_test.ff4",
-                        absl::MakeConstSpan(ff4_data)}}, flagfile_flag),
-  };
-  EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args1),
-               "Unknown command line flag 'unknown_flag'");
-
-  constexpr const char* const ff5_data[] = {
-    "--int_flag 10",
-  };
-
-  const char* in_args2[] = {
-      "testbin",
-      GetFlagfileFlag({{"parse_test.ff5",
-                        absl::MakeConstSpan(ff5_data)}}, flagfile_flag),
-  };
-  EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args2),
-               "Unknown command line flag 'int_flag 10'");
-
-  constexpr const char* const ff6_data[] = {
-      "--int_flag=10", "--", "arg1", "arg2", "arg3",
-  };
-
-  const char* in_args3[] = {
-      "testbin",
-      GetFlagfileFlag({{"parse_test.ff6", absl::MakeConstSpan(ff6_data)}},
-                      flagfile_flag),
-  };
-  EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args3),
-               "Flagfile can't contain position arguments or --");
-
-  const char* in_args4[] = {
-      "testbin",
-      "--flagfile=invalid_flag_file",
-  };
-  EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args4),
-                            "Can't open flagfile invalid_flag_file");
-
-  constexpr const char* const ff7_data[] = {
-      "--int_flag=10",
-      "*bin*",
-      "--str_flag=aqsw",
-  };
-
-  const char* in_args5[] = {
-      "testbin",
-      GetFlagfileFlag({{"parse_test.ff7", absl::MakeConstSpan(ff7_data)}},
-                      flagfile_flag),
-  };
-  EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args5),
-               "Unexpected line in the flagfile .*: \\*bin\\*");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseTest, TestReadingRequiredFlagsFromEnv) {
-  const char* in_args1[] = {"testbin",
-                            "--fromenv=int_flag,bool_flag,string_flag"};
-
-  ScopedSetEnv set_int_flag("FLAGS_int_flag", "33");
-  ScopedSetEnv set_bool_flag("FLAGS_bool_flag", "True");
-  ScopedSetEnv set_string_flag("FLAGS_string_flag", "AQ12");
-
-  TestParse(in_args1, 33, 1.1, "AQ12", true);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseDeathTest, TestReadingUnsetRequiredFlagsFromEnv) {
-  const char* in_args1[] = {"testbin", "--fromenv=int_flag"};
-
-  EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args1),
-               "FLAGS_int_flag not found in environment");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseDeathTest, TestRecursiveFlagsFromEnv) {
-  const char* in_args1[] = {"testbin", "--fromenv=tryfromenv"};
-
-  ScopedSetEnv set_tryfromenv("FLAGS_tryfromenv", "int_flag");
-
-  EXPECT_DEATH_IF_SUPPORTED(InvokeParse(in_args1),
-                            "Infinite recursion on flag tryfromenv");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseTest, TestReadingOptionalFlagsFromEnv) {
-  const char* in_args1[] = {
-      "testbin", "--tryfromenv=int_flag,bool_flag,string_flag,other_flag"};
-
-  ScopedSetEnv set_int_flag("FLAGS_int_flag", "17");
-  ScopedSetEnv set_bool_flag("FLAGS_bool_flag", "Y");
-
-  TestParse(in_args1, 17, 1.1, "a", true);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseTest, TestReadingFlagsFromEnvMoxedWithRegularFlags) {
-  const char* in_args1[] = {
-      "testbin",
-      "--bool_flag=T",
-      "--tryfromenv=int_flag,bool_flag",
-      "--int_flag=-21",
-  };
-
-  ScopedSetEnv set_int_flag("FLAGS_int_flag", "-15");
-  ScopedSetEnv set_bool_flag("FLAGS_bool_flag", "F");
-
-  TestParse(in_args1, -21, 1.1, "a", false);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseTest, TestKeepParsedArgs) {
-  const char* in_args1[] = {
-      "testbin",        "arg1", "--bool_flag",
-      "--int_flag=211", "arg2", "--double_flag=1.1",
-      "--string_flag",  "asd",  "--",
-      "arg3",           "arg4",
-  };
-
-  auto out_args1 = InvokeParse(in_args1);
-
-  EXPECT_THAT(
-      out_args1,
-      ElementsAreArray({absl::string_view("testbin"), absl::string_view("arg1"),
-                        absl::string_view("arg2"), absl::string_view("arg3"),
-                        absl::string_view("arg4")}));
-
-  auto out_args2 = flags::ParseCommandLineImpl(
-      11, const_cast<char**>(in_args1), flags::ArgvListAction::kKeepParsedArgs,
-      flags::UsageFlagsAction::kHandleUsage,
-      flags::OnUndefinedFlag::kAbortIfUndefined);
-
-  EXPECT_THAT(
-      out_args2,
-      ElementsAreArray({absl::string_view("testbin"),
-                        absl::string_view("--bool_flag"),
-                        absl::string_view("--int_flag=211"),
-                        absl::string_view("--double_flag=1.1"),
-                        absl::string_view("--string_flag"),
-                        absl::string_view("asd"), absl::string_view("--"),
-                        absl::string_view("arg1"), absl::string_view("arg2"),
-                        absl::string_view("arg3"), absl::string_view("arg4")}));
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseTest, TestIgnoreUndefinedFlags) {
-  const char* in_args1[] = {
-      "testbin",
-      "arg1",
-      "--undef_flag=aa",
-      "--int_flag=21",
-  };
-
-  auto out_args1 = flags::ParseCommandLineImpl(
-      4, const_cast<char**>(in_args1), flags::ArgvListAction::kRemoveParsedArgs,
-      flags::UsageFlagsAction::kHandleUsage,
-      flags::OnUndefinedFlag::kIgnoreUndefined);
-
-  EXPECT_THAT(out_args1, ElementsAreArray({absl::string_view("testbin"),
-                                           absl::string_view("arg1")}));
-
-  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 21);
-
-  const char* in_args2[] = {
-      "testbin",
-      "arg1",
-      "--undef_flag=aa",
-      "--string_flag=AA",
-  };
-
-  auto out_args2 = flags::ParseCommandLineImpl(
-      4, const_cast<char**>(in_args2), flags::ArgvListAction::kKeepParsedArgs,
-      flags::UsageFlagsAction::kHandleUsage,
-      flags::OnUndefinedFlag::kIgnoreUndefined);
-
-  EXPECT_THAT(
-      out_args2,
-      ElementsAreArray(
-          {absl::string_view("testbin"), absl::string_view("--undef_flag=aa"),
-           absl::string_view("--string_flag=AA"), absl::string_view("arg1")}));
-
-  EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "AA");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseDeathTest, TestSimpleHelpFlagHandling) {
-  const char* in_args1[] = {
-      "testbin",
-      "--help",
-  };
-
-  EXPECT_EXIT(InvokeParse(in_args1), testing::ExitedWithCode(1), "");
-
-  const char* in_args2[] = {
-      "testbin",
-      "--help",
-      "--int_flag=3",
-  };
-
-  auto out_args2 = flags::ParseCommandLineImpl(
-      3, const_cast<char**>(in_args2), flags::ArgvListAction::kRemoveParsedArgs,
-      flags::UsageFlagsAction::kIgnoreUsage,
-      flags::OnUndefinedFlag::kAbortIfUndefined);
-
-  EXPECT_EQ(flags::GetFlagsHelpMode(), flags::HelpMode::kImportant);
-  EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 3);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseDeathTest, TestSubstringHelpFlagHandling) {
-  const char* in_args1[] = {
-      "testbin",
-      "--help=abcd",
-  };
-
-  auto out_args1 = flags::ParseCommandLineImpl(
-      2, const_cast<char**>(in_args1), flags::ArgvListAction::kRemoveParsedArgs,
-      flags::UsageFlagsAction::kIgnoreUsage,
-      flags::OnUndefinedFlag::kAbortIfUndefined);
-
-  EXPECT_EQ(flags::GetFlagsHelpMode(), flags::HelpMode::kMatch);
-  EXPECT_EQ(flags::GetFlagsHelpMatchSubstr(), "abcd");
-
-  const char* in_args2[] = {"testbin", "--help", "some_positional_arg"};
-
-  auto out_args2 = flags::ParseCommandLineImpl(
-      3, const_cast<char**>(in_args2), flags::ArgvListAction::kRemoveParsedArgs,
-      flags::UsageFlagsAction::kIgnoreUsage,
-      flags::OnUndefinedFlag::kAbortIfUndefined);
-
-  EXPECT_EQ(flags::GetFlagsHelpMode(), flags::HelpMode::kImportant);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ParseTest, WasPresentOnCommandLine) {
-  const char* in_args1[] = {
-      "testbin",        "arg1", "--bool_flag",
-      "--int_flag=211", "arg2", "--double_flag=1.1",
-      "--string_flag",  "asd",  "--",
-      "--some_flag",    "arg4",
-  };
-
-  InvokeParse(in_args1);
-
-  EXPECT_TRUE(flags::WasPresentOnCommandLine("bool_flag"));
-  EXPECT_TRUE(flags::WasPresentOnCommandLine("int_flag"));
-  EXPECT_TRUE(flags::WasPresentOnCommandLine("double_flag"));
-  EXPECT_TRUE(flags::WasPresentOnCommandLine("string_flag"));
-  EXPECT_FALSE(flags::WasPresentOnCommandLine("some_flag"));
-  EXPECT_FALSE(flags::WasPresentOnCommandLine("another_flag"));
-}
-
-// --------------------------------------------------------------------
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/flags/reflection.cc b/third_party/abseil_cpp/absl/flags/reflection.cc
deleted file mode 100644
index c976d4679601..000000000000
--- a/third_party/abseil_cpp/absl/flags/reflection.cc
+++ /dev/null
@@ -1,337 +0,0 @@
-//
-//  Copyright 2020 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/reflection.h"
-
-#include <assert.h>
-
-#include <atomic>
-#include <map>
-#include <string>
-
-#include "absl/base/config.h"
-#include "absl/base/thread_annotations.h"
-#include "absl/flags/commandlineflag.h"
-#include "absl/flags/internal/private_handle_accessor.h"
-#include "absl/flags/internal/registry.h"
-#include "absl/flags/usage_config.h"
-#include "absl/strings/str_cat.h"
-#include "absl/strings/string_view.h"
-#include "absl/synchronization/mutex.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-
-// --------------------------------------------------------------------
-// FlagRegistry
-//    A FlagRegistry singleton object holds all flag objects indexed by their
-//    names so that if you know a flag's name, you can access or set it. If the
-//    function is named FooLocked(), you must own the registry lock before
-//    calling the function; otherwise, you should *not* hold the lock, and the
-//    function will acquire it itself if needed.
-// --------------------------------------------------------------------
-
-class FlagRegistry {
- public:
-  FlagRegistry() = default;
-  ~FlagRegistry() = default;
-
-  // Store a flag in this registry. Takes ownership of *flag.
-  void RegisterFlag(CommandLineFlag& flag);
-
-  void Lock() ABSL_EXCLUSIVE_LOCK_FUNCTION(lock_) { lock_.Lock(); }
-  void Unlock() ABSL_UNLOCK_FUNCTION(lock_) { lock_.Unlock(); }
-
-  // Returns the flag object for the specified name, or nullptr if not found.
-  // Will emit a warning if a 'retired' flag is specified.
-  CommandLineFlag* FindFlag(absl::string_view name);
-
-  static FlagRegistry& GlobalRegistry();  // returns a singleton registry
-
- private:
-  friend class flags_internal::FlagSaverImpl;  // reads all the flags in order
-                                               // to copy them
-  friend void ForEachFlag(std::function<void(CommandLineFlag&)> visitor);
-  friend void FinalizeRegistry();
-
-  // The map from name to flag, for FindFlag().
-  using FlagMap = std::map<absl::string_view, CommandLineFlag*>;
-  using FlagIterator = FlagMap::iterator;
-  using FlagConstIterator = FlagMap::const_iterator;
-  FlagMap flags_;
-  std::vector<CommandLineFlag*> flat_flags_;
-  std::atomic<bool> finalized_flags_{false};
-
-  absl::Mutex lock_;
-
-  // Disallow
-  FlagRegistry(const FlagRegistry&);
-  FlagRegistry& operator=(const FlagRegistry&);
-};
-
-namespace {
-
-class FlagRegistryLock {
- public:
-  explicit FlagRegistryLock(FlagRegistry& fr) : fr_(fr) { fr_.Lock(); }
-  ~FlagRegistryLock() { fr_.Unlock(); }
-
- private:
-  FlagRegistry& fr_;
-};
-
-}  // namespace
-
-CommandLineFlag* FlagRegistry::FindFlag(absl::string_view name) {
-  if (finalized_flags_.load(std::memory_order_acquire)) {
-    // We could save some gcus here if we make `Name()` be non-virtual.
-    // We could move the `const char*` name to the base class.
-    auto it = std::partition_point(
-        flat_flags_.begin(), flat_flags_.end(),
-        [=](CommandLineFlag* f) { return f->Name() < name; });
-    if (it != flat_flags_.end() && (*it)->Name() == name) return *it;
-  }
-
-  FlagRegistryLock frl(*this);
-  auto it = flags_.find(name);
-  return it != flags_.end() ? it->second : nullptr;
-}
-
-void FlagRegistry::RegisterFlag(CommandLineFlag& flag) {
-  FlagRegistryLock registry_lock(*this);
-
-  std::pair<FlagIterator, bool> ins =
-      flags_.insert(FlagMap::value_type(flag.Name(), &flag));
-  if (ins.second == false) {  // means the name was already in the map
-    CommandLineFlag& old_flag = *ins.first->second;
-    if (flag.IsRetired() != old_flag.IsRetired()) {
-      // All registrations must agree on the 'retired' flag.
-      flags_internal::ReportUsageError(
-          absl::StrCat(
-              "Retired flag '", flag.Name(), "' was defined normally in file '",
-              (flag.IsRetired() ? old_flag.Filename() : flag.Filename()), "'."),
-          true);
-    } else if (flags_internal::PrivateHandleAccessor::TypeId(flag) !=
-               flags_internal::PrivateHandleAccessor::TypeId(old_flag)) {
-      flags_internal::ReportUsageError(
-          absl::StrCat("Flag '", flag.Name(),
-                       "' was defined more than once but with "
-                       "differing types. Defined in files '",
-                       old_flag.Filename(), "' and '", flag.Filename(), "'."),
-          true);
-    } else if (old_flag.IsRetired()) {
-      return;
-    } else if (old_flag.Filename() != flag.Filename()) {
-      flags_internal::ReportUsageError(
-          absl::StrCat("Flag '", flag.Name(),
-                       "' was defined more than once (in files '",
-                       old_flag.Filename(), "' and '", flag.Filename(), "')."),
-          true);
-    } else {
-      flags_internal::ReportUsageError(
-          absl::StrCat(
-              "Something is wrong with flag '", flag.Name(), "' in file '",
-              flag.Filename(), "'. One possibility: file '", flag.Filename(),
-              "' is being linked both statically and dynamically into this "
-              "executable. e.g. some files listed as srcs to a test and also "
-              "listed as srcs of some shared lib deps of the same test."),
-          true);
-    }
-    // All cases above are fatal, except for the retired flags.
-    std::exit(1);
-  }
-}
-
-FlagRegistry& FlagRegistry::GlobalRegistry() {
-  static FlagRegistry* global_registry = new FlagRegistry;
-  return *global_registry;
-}
-
-// --------------------------------------------------------------------
-
-void ForEachFlag(std::function<void(CommandLineFlag&)> visitor) {
-  FlagRegistry& registry = FlagRegistry::GlobalRegistry();
-
-  if (registry.finalized_flags_.load(std::memory_order_acquire)) {
-    for (const auto& i : registry.flat_flags_) visitor(*i);
-  }
-
-  FlagRegistryLock frl(registry);
-  for (const auto& i : registry.flags_) visitor(*i.second);
-}
-
-// --------------------------------------------------------------------
-
-bool RegisterCommandLineFlag(CommandLineFlag& flag) {
-  FlagRegistry::GlobalRegistry().RegisterFlag(flag);
-  return true;
-}
-
-void FinalizeRegistry() {
-  auto& registry = FlagRegistry::GlobalRegistry();
-  FlagRegistryLock frl(registry);
-  if (registry.finalized_flags_.load(std::memory_order_relaxed)) {
-    // Was already finalized. Ignore the second time.
-    return;
-  }
-  registry.flat_flags_.reserve(registry.flags_.size());
-  for (const auto& f : registry.flags_) {
-    registry.flat_flags_.push_back(f.second);
-  }
-  registry.flags_.clear();
-  registry.finalized_flags_.store(true, std::memory_order_release);
-}
-
-// --------------------------------------------------------------------
-
-namespace {
-
-class RetiredFlagObj final : public CommandLineFlag {
- public:
-  constexpr RetiredFlagObj(const char* name, FlagFastTypeId type_id)
-      : name_(name), type_id_(type_id) {}
-
- private:
-  absl::string_view Name() const override { return name_; }
-  std::string Filename() const override {
-    OnAccess();
-    return "RETIRED";
-  }
-  FlagFastTypeId TypeId() const override { return type_id_; }
-  std::string Help() const override {
-    OnAccess();
-    return "";
-  }
-  bool IsRetired() const override { return true; }
-  bool IsSpecifiedOnCommandLine() const override {
-    OnAccess();
-    return false;
-  }
-  std::string DefaultValue() const override {
-    OnAccess();
-    return "";
-  }
-  std::string CurrentValue() const override {
-    OnAccess();
-    return "";
-  }
-
-  // Any input is valid
-  bool ValidateInputValue(absl::string_view) const override {
-    OnAccess();
-    return true;
-  }
-
-  std::unique_ptr<flags_internal::FlagStateInterface> SaveState() override {
-    return nullptr;
-  }
-
-  bool ParseFrom(absl::string_view, flags_internal::FlagSettingMode,
-                 flags_internal::ValueSource, std::string&) override {
-    OnAccess();
-    return false;
-  }
-
-  void CheckDefaultValueParsingRoundtrip() const override { OnAccess(); }
-
-  void Read(void*) const override { OnAccess(); }
-
-  void OnAccess() const {
-    flags_internal::ReportUsageError(
-        absl::StrCat("Accessing retired flag '", name_, "'"), false);
-  }
-
-  // Data members
-  const char* const name_;
-  const FlagFastTypeId type_id_;
-};
-
-}  // namespace
-
-void Retire(const char* name, FlagFastTypeId type_id, char* buf) {
-  static_assert(sizeof(RetiredFlagObj) == kRetiredFlagObjSize, "");
-  static_assert(alignof(RetiredFlagObj) == kRetiredFlagObjAlignment, "");
-  auto* flag = ::new (static_cast<void*>(buf))
-      flags_internal::RetiredFlagObj(name, type_id);
-  FlagRegistry::GlobalRegistry().RegisterFlag(*flag);
-}
-
-// --------------------------------------------------------------------
-
-class FlagSaverImpl {
- public:
-  FlagSaverImpl() = default;
-  FlagSaverImpl(const FlagSaverImpl&) = delete;
-  void operator=(const FlagSaverImpl&) = delete;
-
-  // Saves the flag states from the flag registry into this object.
-  // It's an error to call this more than once.
-  void SaveFromRegistry() {
-    assert(backup_registry_.empty());  // call only once!
-    flags_internal::ForEachFlag([&](CommandLineFlag& flag) {
-      if (auto flag_state =
-              flags_internal::PrivateHandleAccessor::SaveState(flag)) {
-        backup_registry_.emplace_back(std::move(flag_state));
-      }
-    });
-  }
-
-  // Restores the saved flag states into the flag registry.
-  void RestoreToRegistry() {
-    for (const auto& flag_state : backup_registry_) {
-      flag_state->Restore();
-    }
-  }
-
- private:
-  std::vector<std::unique_ptr<flags_internal::FlagStateInterface>>
-      backup_registry_;
-};
-
-}  // namespace flags_internal
-
-FlagSaver::FlagSaver() : impl_(new flags_internal::FlagSaverImpl) {
-  impl_->SaveFromRegistry();
-}
-
-FlagSaver::~FlagSaver() {
-  if (!impl_) return;
-
-  impl_->RestoreToRegistry();
-  delete impl_;
-}
-
-// --------------------------------------------------------------------
-
-CommandLineFlag* FindCommandLineFlag(absl::string_view name) {
-  if (name.empty()) return nullptr;
-  flags_internal::FlagRegistry& registry =
-      flags_internal::FlagRegistry::GlobalRegistry();
-  return registry.FindFlag(name);
-}
-
-// --------------------------------------------------------------------
-
-absl::flat_hash_map<absl::string_view, absl::CommandLineFlag*> GetAllFlags() {
-  absl::flat_hash_map<absl::string_view, absl::CommandLineFlag*> res;
-  flags_internal::ForEachFlag([&](CommandLineFlag& flag) {
-    if (!flag.IsRetired()) res.insert({flag.Name(), &flag});
-  });
-  return res;
-}
-
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/flags/reflection.h b/third_party/abseil_cpp/absl/flags/reflection.h
deleted file mode 100644
index e6baf5de4b0c..000000000000
--- a/third_party/abseil_cpp/absl/flags/reflection.h
+++ /dev/null
@@ -1,90 +0,0 @@
-//
-// Copyright 2020 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-// -----------------------------------------------------------------------------
-// File: reflection.h
-// -----------------------------------------------------------------------------
-//
-// This file defines the routines to access and operate on an Abseil Flag's
-// reflection handle.
-
-#ifndef ABSL_FLAGS_REFLECTION_H_
-#define ABSL_FLAGS_REFLECTION_H_
-
-#include <string>
-
-#include "absl/base/config.h"
-#include "absl/container/flat_hash_map.h"
-#include "absl/flags/commandlineflag.h"
-#include "absl/flags/internal/commandlineflag.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-class FlagSaverImpl;
-}  // namespace flags_internal
-
-// FindCommandLineFlag()
-//
-// Returns the reflection handle of an Abseil flag of the specified name, or
-// `nullptr` if not found. This function will emit a warning if the name of a
-// 'retired' flag is specified.
-absl::CommandLineFlag* FindCommandLineFlag(absl::string_view name);
-
-// Returns current state of the Flags registry in a form of mapping from flag
-// name to a flag reflection handle.
-absl::flat_hash_map<absl::string_view, absl::CommandLineFlag*> GetAllFlags();
-
-//------------------------------------------------------------------------------
-// FlagSaver
-//------------------------------------------------------------------------------
-//
-// A FlagSaver object stores the state of flags in the scope where the FlagSaver
-// is defined, allowing modification of those flags within that scope and
-// automatic restoration of the flags to their previous state upon leaving the
-// scope.
-//
-// A FlagSaver can be used within tests to temporarily change the test
-// environment and restore the test case to its previous state.
-//
-// Example:
-//
-//   void MyFunc() {
-//    absl::FlagSaver fs;
-//    ...
-//    absl::SetFlag(&FLAGS_myFlag, otherValue);
-//    ...
-//  } // scope of FlagSaver left, flags return to previous state
-//
-// This class is thread-safe.
-
-class FlagSaver {
- public:
-  FlagSaver();
-  ~FlagSaver();
-
-  FlagSaver(const FlagSaver&) = delete;
-  void operator=(const FlagSaver&) = delete;
-
- private:
-  flags_internal::FlagSaverImpl* impl_;
-};
-
-//-----------------------------------------------------------------------------
-
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_FLAGS_REFLECTION_H_
diff --git a/third_party/abseil_cpp/absl/flags/reflection_test.cc b/third_party/abseil_cpp/absl/flags/reflection_test.cc
deleted file mode 100644
index 4c80900956a9..000000000000
--- a/third_party/abseil_cpp/absl/flags/reflection_test.cc
+++ /dev/null
@@ -1,267 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/reflection.h"
-
-#include <memory>
-#include <string>
-
-#include "gmock/gmock.h"
-#include "gtest/gtest.h"
-#include "absl/flags/declare.h"
-#include "absl/flags/flag.h"
-#include "absl/flags/internal/commandlineflag.h"
-#include "absl/flags/marshalling.h"
-#include "absl/memory/memory.h"
-#include "absl/strings/str_cat.h"
-#include "absl/strings/str_split.h"
-
-ABSL_FLAG(int, int_flag, 1, "int_flag help");
-ABSL_FLAG(std::string, string_flag, "dflt", "string_flag help");
-ABSL_RETIRED_FLAG(bool, bool_retired_flag, false, "bool_retired_flag help");
-
-namespace {
-
-namespace flags = absl::flags_internal;
-
-class ReflectionTest : public testing::Test {
- protected:
-  void SetUp() override { flag_saver_ = absl::make_unique<absl::FlagSaver>(); }
-  void TearDown() override { flag_saver_.reset(); }
-
- private:
-  std::unique_ptr<absl::FlagSaver> flag_saver_;
-};
-
-// --------------------------------------------------------------------
-
-TEST_F(ReflectionTest, TestFindCommandLineFlag) {
-  auto* handle = absl::FindCommandLineFlag("some_flag");
-  EXPECT_EQ(handle, nullptr);
-
-  handle = absl::FindCommandLineFlag("int_flag");
-  EXPECT_NE(handle, nullptr);
-
-  handle = absl::FindCommandLineFlag("string_flag");
-  EXPECT_NE(handle, nullptr);
-
-  handle = absl::FindCommandLineFlag("bool_retired_flag");
-  EXPECT_NE(handle, nullptr);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ReflectionTest, TestGetAllFlags) {
-  auto all_flags = absl::GetAllFlags();
-  EXPECT_NE(all_flags.find("int_flag"), all_flags.end());
-  EXPECT_EQ(all_flags.find("bool_retired_flag"), all_flags.end());
-  EXPECT_EQ(all_flags.find("some_undefined_flag"), all_flags.end());
-
-  std::vector<absl::string_view> flag_names_first_attempt;
-  auto all_flags_1 = absl::GetAllFlags();
-  for (auto f : all_flags_1) {
-    flag_names_first_attempt.push_back(f.first);
-  }
-
-  std::vector<absl::string_view> flag_names_second_attempt;
-  auto all_flags_2 = absl::GetAllFlags();
-  for (auto f : all_flags_2) {
-    flag_names_second_attempt.push_back(f.first);
-  }
-
-  EXPECT_THAT(flag_names_first_attempt,
-              ::testing::UnorderedElementsAreArray(flag_names_second_attempt));
-}
-
-// --------------------------------------------------------------------
-
-struct CustomUDT {
-  CustomUDT() : a(1), b(1) {}
-  CustomUDT(int a_, int b_) : a(a_), b(b_) {}
-
-  friend bool operator==(const CustomUDT& f1, const CustomUDT& f2) {
-    return f1.a == f2.a && f1.b == f2.b;
-  }
-
-  int a;
-  int b;
-};
-bool AbslParseFlag(absl::string_view in, CustomUDT* f, std::string*) {
-  std::vector<absl::string_view> parts =
-      absl::StrSplit(in, ':', absl::SkipWhitespace());
-
-  if (parts.size() != 2) return false;
-
-  if (!absl::SimpleAtoi(parts[0], &f->a)) return false;
-
-  if (!absl::SimpleAtoi(parts[1], &f->b)) return false;
-
-  return true;
-}
-std::string AbslUnparseFlag(const CustomUDT& f) {
-  return absl::StrCat(f.a, ":", f.b);
-}
-
-}  // namespace
-
-// --------------------------------------------------------------------
-
-ABSL_FLAG(bool, test_flag_01, true, "");
-ABSL_FLAG(int, test_flag_02, 1234, "");
-ABSL_FLAG(int16_t, test_flag_03, -34, "");
-ABSL_FLAG(uint16_t, test_flag_04, 189, "");
-ABSL_FLAG(int32_t, test_flag_05, 10765, "");
-ABSL_FLAG(uint32_t, test_flag_06, 40000, "");
-ABSL_FLAG(int64_t, test_flag_07, -1234567, "");
-ABSL_FLAG(uint64_t, test_flag_08, 9876543, "");
-ABSL_FLAG(double, test_flag_09, -9.876e-50, "");
-ABSL_FLAG(float, test_flag_10, 1.234e12f, "");
-ABSL_FLAG(std::string, test_flag_11, "", "");
-ABSL_FLAG(absl::Duration, test_flag_12, absl::Minutes(10), "");
-static int counter = 0;
-ABSL_FLAG(int, test_flag_13, 200, "").OnUpdate([]() { counter++; });
-ABSL_FLAG(CustomUDT, test_flag_14, {}, "");
-
-namespace {
-
-TEST_F(ReflectionTest, TestFlagSaverInScope) {
-  {
-    absl::FlagSaver s;
-    counter = 0;
-    absl::SetFlag(&FLAGS_test_flag_01, false);
-    absl::SetFlag(&FLAGS_test_flag_02, -1021);
-    absl::SetFlag(&FLAGS_test_flag_03, 6009);
-    absl::SetFlag(&FLAGS_test_flag_04, 44);
-    absl::SetFlag(&FLAGS_test_flag_05, +800);
-    absl::SetFlag(&FLAGS_test_flag_06, -40978756);
-    absl::SetFlag(&FLAGS_test_flag_07, 23405);
-    absl::SetFlag(&FLAGS_test_flag_08, 975310);
-    absl::SetFlag(&FLAGS_test_flag_09, 1.00001);
-    absl::SetFlag(&FLAGS_test_flag_10, -3.54f);
-    absl::SetFlag(&FLAGS_test_flag_11, "asdf");
-    absl::SetFlag(&FLAGS_test_flag_12, absl::Hours(20));
-    absl::SetFlag(&FLAGS_test_flag_13, 4);
-    absl::SetFlag(&FLAGS_test_flag_14, CustomUDT{-1, -2});
-  }
-
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_01), true);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_02), 1234);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_03), -34);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_04), 189);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_05), 10765);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_06), 40000);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_07), -1234567);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 9876543);
-  EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_09), -9.876e-50, 1e-55);
-  EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_10), 1.234e12f, 1e5f);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_11), "");
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_12), absl::Minutes(10));
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_13), 200);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_14), CustomUDT{});
-  EXPECT_EQ(counter, 2);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ReflectionTest, TestFlagSaverVsUpdateViaReflection) {
-  {
-    absl::FlagSaver s;
-    counter = 0;
-    std::string error;
-    EXPECT_TRUE(
-        absl::FindCommandLineFlag("test_flag_01")->ParseFrom("false", &error))
-        << error;
-    EXPECT_TRUE(
-        absl::FindCommandLineFlag("test_flag_02")->ParseFrom("-4536", &error))
-        << error;
-    EXPECT_TRUE(
-        absl::FindCommandLineFlag("test_flag_03")->ParseFrom("111", &error))
-        << error;
-    EXPECT_TRUE(
-        absl::FindCommandLineFlag("test_flag_04")->ParseFrom("909", &error))
-        << error;
-    EXPECT_TRUE(
-        absl::FindCommandLineFlag("test_flag_05")->ParseFrom("-2004", &error))
-        << error;
-    EXPECT_TRUE(
-        absl::FindCommandLineFlag("test_flag_06")->ParseFrom("1000023", &error))
-        << error;
-    EXPECT_TRUE(
-        absl::FindCommandLineFlag("test_flag_07")->ParseFrom("69305", &error))
-        << error;
-    EXPECT_TRUE(absl::FindCommandLineFlag("test_flag_08")
-                    ->ParseFrom("1000000001", &error))
-        << error;
-    EXPECT_TRUE(
-        absl::FindCommandLineFlag("test_flag_09")->ParseFrom("2.09021", &error))
-        << error;
-    EXPECT_TRUE(
-        absl::FindCommandLineFlag("test_flag_10")->ParseFrom("-33.1", &error))
-        << error;
-    EXPECT_TRUE(
-        absl::FindCommandLineFlag("test_flag_11")->ParseFrom("ADD_FOO", &error))
-        << error;
-    EXPECT_TRUE(absl::FindCommandLineFlag("test_flag_12")
-                    ->ParseFrom("3h11m16s", &error))
-        << error;
-    EXPECT_TRUE(
-        absl::FindCommandLineFlag("test_flag_13")->ParseFrom("0", &error))
-        << error;
-    EXPECT_TRUE(
-        absl::FindCommandLineFlag("test_flag_14")->ParseFrom("10:1", &error))
-        << error;
-  }
-
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_01), true);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_02), 1234);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_03), -34);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_04), 189);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_05), 10765);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_06), 40000);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_07), -1234567);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 9876543);
-  EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_09), -9.876e-50, 1e-55);
-  EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_10), 1.234e12f, 1e5f);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_11), "");
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_12), absl::Minutes(10));
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_13), 200);
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_14), CustomUDT{});
-  EXPECT_EQ(counter, 2);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(ReflectionTest, TestMultipleFlagSaversInEnclosedScopes) {
-  {
-    absl::FlagSaver s;
-    absl::SetFlag(&FLAGS_test_flag_08, 10);
-    EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 10);
-    {
-      absl::FlagSaver s;
-      absl::SetFlag(&FLAGS_test_flag_08, 20);
-      EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 20);
-      {
-        absl::FlagSaver s;
-        absl::SetFlag(&FLAGS_test_flag_08, -200);
-        EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), -200);
-      }
-      EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 20);
-    }
-    EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 10);
-  }
-  EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 9876543);
-}
-
-}  // namespace
diff --git a/third_party/abseil_cpp/absl/flags/usage.cc b/third_party/abseil_cpp/absl/flags/usage.cc
deleted file mode 100644
index 452f667512e8..000000000000
--- a/third_party/abseil_cpp/absl/flags/usage.cc
+++ /dev/null
@@ -1,65 +0,0 @@
-//
-// Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-#include "absl/flags/usage.h"
-
-#include <stdlib.h>
-
-#include <string>
-
-#include "absl/base/attributes.h"
-#include "absl/base/config.h"
-#include "absl/base/const_init.h"
-#include "absl/base/thread_annotations.h"
-#include "absl/flags/internal/usage.h"
-#include "absl/strings/string_view.h"
-#include "absl/synchronization/mutex.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-namespace {
-ABSL_CONST_INIT absl::Mutex usage_message_guard(absl::kConstInit);
-ABSL_CONST_INIT std::string* program_usage_message
-    ABSL_GUARDED_BY(usage_message_guard) = nullptr;
-}  // namespace
-}  // namespace flags_internal
-
-// --------------------------------------------------------------------
-// Sets the "usage" message to be used by help reporting routines.
-void SetProgramUsageMessage(absl::string_view new_usage_message) {
-  absl::MutexLock l(&flags_internal::usage_message_guard);
-
-  if (flags_internal::program_usage_message != nullptr) {
-    ABSL_INTERNAL_LOG(FATAL, "SetProgramUsageMessage() called twice.");
-    std::exit(1);
-  }
-
-  flags_internal::program_usage_message = new std::string(new_usage_message);
-}
-
-// --------------------------------------------------------------------
-// Returns the usage message set by SetProgramUsageMessage().
-// Note: We able to return string_view here only because calling
-// SetProgramUsageMessage twice is prohibited.
-absl::string_view ProgramUsageMessage() {
-  absl::MutexLock l(&flags_internal::usage_message_guard);
-
-  return flags_internal::program_usage_message != nullptr
-             ? absl::string_view(*flags_internal::program_usage_message)
-             : "Warning: SetProgramUsageMessage() never called";
-}
-
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/flags/usage.h b/third_party/abseil_cpp/absl/flags/usage.h
deleted file mode 100644
index ad12ab7ad902..000000000000
--- a/third_party/abseil_cpp/absl/flags/usage.h
+++ /dev/null
@@ -1,43 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef ABSL_FLAGS_USAGE_H_
-#define ABSL_FLAGS_USAGE_H_
-
-#include "absl/base/config.h"
-#include "absl/strings/string_view.h"
-
-// --------------------------------------------------------------------
-// Usage reporting interfaces
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-
-// Sets the "usage" message to be used by help reporting routines.
-// For example:
-//  absl::SetProgramUsageMessage(
-//      absl::StrCat("This program does nothing.  Sample usage:\n", argv[0],
-//                   " <uselessarg1> <uselessarg2>"));
-// Do not include commandline flags in the usage: we do that for you!
-// Note: Calling SetProgramUsageMessage twice will trigger a call to std::exit.
-void SetProgramUsageMessage(absl::string_view new_usage_message);
-
-// Returns the usage message set by SetProgramUsageMessage().
-absl::string_view ProgramUsageMessage();
-
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_FLAGS_USAGE_H_
diff --git a/third_party/abseil_cpp/absl/flags/usage_config.cc b/third_party/abseil_cpp/absl/flags/usage_config.cc
deleted file mode 100644
index ae2f548a570b..000000000000
--- a/third_party/abseil_cpp/absl/flags/usage_config.cc
+++ /dev/null
@@ -1,164 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/usage_config.h"
-
-#include <functional>
-#include <iostream>
-#include <string>
-
-#include "absl/base/attributes.h"
-#include "absl/base/config.h"
-#include "absl/base/const_init.h"
-#include "absl/base/thread_annotations.h"
-#include "absl/flags/internal/path_util.h"
-#include "absl/flags/internal/program_name.h"
-#include "absl/strings/match.h"
-#include "absl/strings/string_view.h"
-#include "absl/strings/strip.h"
-#include "absl/synchronization/mutex.h"
-
-extern "C" {
-
-// Additional report of fatal usage error message before we std::exit. Error is
-// fatal if is_fatal argument to ReportUsageError is true.
-ABSL_ATTRIBUTE_WEAK void AbslInternalReportFatalUsageError(absl::string_view) {}
-
-}  // extern "C"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace flags_internal {
-
-namespace {
-
-// --------------------------------------------------------------------
-// Returns true if flags defined in the filename should be reported with
-// -helpshort flag.
-
-bool ContainsHelpshortFlags(absl::string_view filename) {
-  // By default we only want flags in binary's main. We expect the main
-  // routine to reside in <program>.cc or <program>-main.cc or
-  // <program>_main.cc, where the <program> is the name of the binary
-  // (without .exe on Windows).
-  auto suffix = flags_internal::Basename(filename);
-  auto program_name = flags_internal::ShortProgramInvocationName();
-  absl::string_view program_name_ref = program_name;
-#if defined(_WIN32)
-  absl::ConsumeSuffix(&program_name_ref, ".exe");
-#endif
-  if (!absl::ConsumePrefix(&suffix, program_name_ref))
-    return false;
-  return absl::StartsWith(suffix, ".") || absl::StartsWith(suffix, "-main.") ||
-         absl::StartsWith(suffix, "_main.");
-}
-
-// --------------------------------------------------------------------
-// Returns true if flags defined in the filename should be reported with
-// -helppackage flag.
-
-bool ContainsHelppackageFlags(absl::string_view filename) {
-  // TODO(rogeeff): implement properly when registry is available.
-  return ContainsHelpshortFlags(filename);
-}
-
-// --------------------------------------------------------------------
-// Generates program version information into supplied output.
-
-std::string VersionString() {
-  std::string version_str(flags_internal::ShortProgramInvocationName());
-
-  version_str += "\n";
-
-#if !defined(NDEBUG)
-  version_str += "Debug build (NDEBUG not #defined)\n";
-#endif
-
-  return version_str;
-}
-
-// --------------------------------------------------------------------
-// Normalizes the filename specific to the build system/filesystem used.
-
-std::string NormalizeFilename(absl::string_view filename) {
-  // Skip any leading slashes
-  auto pos = filename.find_first_not_of("\\/");
-  if (pos == absl::string_view::npos) return "";
-
-  filename.remove_prefix(pos);
-  return std::string(filename);
-}
-
-// --------------------------------------------------------------------
-
-ABSL_CONST_INIT absl::Mutex custom_usage_config_guard(absl::kConstInit);
-ABSL_CONST_INIT FlagsUsageConfig* custom_usage_config
-    ABSL_GUARDED_BY(custom_usage_config_guard) = nullptr;
-
-}  // namespace
-
-FlagsUsageConfig GetUsageConfig() {
-  absl::MutexLock l(&custom_usage_config_guard);
-
-  if (custom_usage_config) return *custom_usage_config;
-
-  FlagsUsageConfig default_config;
-  default_config.contains_helpshort_flags = &ContainsHelpshortFlags;
-  default_config.contains_help_flags = &ContainsHelppackageFlags;
-  default_config.contains_helppackage_flags = &ContainsHelppackageFlags;
-  default_config.version_string = &VersionString;
-  default_config.normalize_filename = &NormalizeFilename;
-
-  return default_config;
-}
-
-void ReportUsageError(absl::string_view msg, bool is_fatal) {
-  std::cerr << "ERROR: " << msg << std::endl;
-
-  if (is_fatal) {
-    AbslInternalReportFatalUsageError(msg);
-  }
-}
-
-}  // namespace flags_internal
-
-void SetFlagsUsageConfig(FlagsUsageConfig usage_config) {
-  absl::MutexLock l(&flags_internal::custom_usage_config_guard);
-
-  if (!usage_config.contains_helpshort_flags)
-    usage_config.contains_helpshort_flags =
-        flags_internal::ContainsHelpshortFlags;
-
-  if (!usage_config.contains_help_flags)
-    usage_config.contains_help_flags = flags_internal::ContainsHelppackageFlags;
-
-  if (!usage_config.contains_helppackage_flags)
-    usage_config.contains_helppackage_flags =
-        flags_internal::ContainsHelppackageFlags;
-
-  if (!usage_config.version_string)
-    usage_config.version_string = flags_internal::VersionString;
-
-  if (!usage_config.normalize_filename)
-    usage_config.normalize_filename = flags_internal::NormalizeFilename;
-
-  if (flags_internal::custom_usage_config)
-    *flags_internal::custom_usage_config = usage_config;
-  else
-    flags_internal::custom_usage_config = new FlagsUsageConfig(usage_config);
-}
-
-ABSL_NAMESPACE_END
-}  // namespace absl
diff --git a/third_party/abseil_cpp/absl/flags/usage_config.h b/third_party/abseil_cpp/absl/flags/usage_config.h
deleted file mode 100644
index 96eecea23159..000000000000
--- a/third_party/abseil_cpp/absl/flags/usage_config.h
+++ /dev/null
@@ -1,134 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-// -----------------------------------------------------------------------------
-// File: usage_config.h
-// -----------------------------------------------------------------------------
-//
-// This file defines the main usage reporting configuration interfaces and
-// documents Abseil's supported built-in usage flags. If these flags are found
-// when parsing a command-line, Abseil will exit the program and display
-// appropriate help messages.
-#ifndef ABSL_FLAGS_USAGE_CONFIG_H_
-#define ABSL_FLAGS_USAGE_CONFIG_H_
-
-#include <functional>
-#include <string>
-
-#include "absl/base/config.h"
-#include "absl/strings/string_view.h"
-
-// -----------------------------------------------------------------------------
-// Built-in Usage Flags
-// -----------------------------------------------------------------------------
-//
-// Abseil supports the following built-in usage flags. When passed, these flags
-// exit the program and :
-//
-// * --help
-//     Shows help on important flags for this binary
-// * --helpfull
-//     Shows help on all flags
-// * --helpshort
-//     Shows help on only the main module for this program
-// * --helppackage
-//     Shows help on all modules in the main package
-// * --version
-//     Shows the version and build info for this binary and exits
-// * --only_check_args
-//     Exits after checking all flags
-// * --helpon
-//     Shows help on the modules named by this flag value
-// * --helpmatch
-//     Shows help on modules whose name contains the specified substring
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-
-namespace flags_internal {
-using FlagKindFilter = std::function<bool (absl::string_view)>;
-}  // namespace flags_internal
-
-// FlagsUsageConfig
-//
-// This structure contains the collection of callbacks for changing the behavior
-// of the usage reporting routines in Abseil Flags.
-struct FlagsUsageConfig {
-  // Returns true if flags defined in the given source code file should be
-  // reported with --helpshort flag. For example, if the file
-  // "path/to/my/code.cc" defines the flag "--my_flag", and
-  // contains_helpshort_flags("path/to/my/code.cc") returns true, invoking the
-  // program with --helpshort will include information about --my_flag in the
-  // program output.
-  flags_internal::FlagKindFilter contains_helpshort_flags;
-
-  // Returns true if flags defined in the filename should be reported with
-  // --help flag. For example, if the file
-  // "path/to/my/code.cc" defines the flag "--my_flag", and
-  // contains_help_flags("path/to/my/code.cc") returns true, invoking the
-  // program with --help will include information about --my_flag in the
-  // program output.
-  flags_internal::FlagKindFilter contains_help_flags;
-
-  // Returns true if flags defined in the filename should be reported with
-  // --helppackage flag. For example, if the file
-  // "path/to/my/code.cc" defines the flag "--my_flag", and
-  // contains_helppackage_flags("path/to/my/code.cc") returns true, invoking the
-  // program with --helppackage will include information about --my_flag in the
-  // program output.
-  flags_internal::FlagKindFilter contains_helppackage_flags;
-
-  // Generates string containing program version. This is the string reported
-  // when user specifies --version in a command line.
-  std::function<std::string()> version_string;
-
-  // Normalizes the filename specific to the build system/filesystem used. This
-  // routine is used when we report the information about the flag definition
-  // location. For instance, if your build resides at some location you do not
-  // want to expose in the usage output, you can trim it to show only relevant
-  // part.
-  // For example:
-  //   normalize_filename("/my_company/some_long_path/src/project/file.cc")
-  // might produce
-  //   "project/file.cc".
-  std::function<std::string(absl::string_view)> normalize_filename;
-};
-
-// SetFlagsUsageConfig()
-//
-// Sets the usage reporting configuration callbacks. If any of the callbacks are
-// not set in usage_config instance, then the default value of the callback is
-// used.
-void SetFlagsUsageConfig(FlagsUsageConfig usage_config);
-
-namespace flags_internal {
-
-FlagsUsageConfig GetUsageConfig();
-
-void ReportUsageError(absl::string_view msg, bool is_fatal);
-
-}  // namespace flags_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-extern "C" {
-
-// Additional report of fatal usage error message before we std::exit. Error is
-// fatal if is_fatal argument to ReportUsageError is true.
-void AbslInternalReportFatalUsageError(absl::string_view);
-
-}  // extern "C"
-
-#endif  // ABSL_FLAGS_USAGE_CONFIG_H_
diff --git a/third_party/abseil_cpp/absl/flags/usage_config_test.cc b/third_party/abseil_cpp/absl/flags/usage_config_test.cc
deleted file mode 100644
index e57a8832f645..000000000000
--- a/third_party/abseil_cpp/absl/flags/usage_config_test.cc
+++ /dev/null
@@ -1,205 +0,0 @@
-//
-//  Copyright 2019 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "absl/flags/usage_config.h"
-
-#include <string>
-
-#include "gtest/gtest.h"
-#include "absl/flags/internal/path_util.h"
-#include "absl/flags/internal/program_name.h"
-#include "absl/strings/match.h"
-#include "absl/strings/string_view.h"
-
-namespace {
-
-class FlagsUsageConfigTest : public testing::Test {
- protected:
-  void SetUp() override {
-    // Install Default config for the use on this unit test.
-    // Binary may install a custom config before tests are run.
-    absl::FlagsUsageConfig default_config;
-    absl::SetFlagsUsageConfig(default_config);
-  }
-};
-
-namespace flags = absl::flags_internal;
-
-bool TstContainsHelpshortFlags(absl::string_view f) {
-  return absl::StartsWith(flags::Basename(f), "progname.");
-}
-
-bool TstContainsHelppackageFlags(absl::string_view f) {
-  return absl::EndsWith(flags::Package(f), "aaa/");
-}
-
-bool TstContainsHelpFlags(absl::string_view f) {
-  return absl::EndsWith(flags::Package(f), "zzz/");
-}
-
-std::string TstVersionString() { return "program 1.0.0"; }
-
-std::string TstNormalizeFilename(absl::string_view filename) {
-  return std::string(filename.substr(2));
-}
-
-void TstReportUsageMessage(absl::string_view msg) {}
-
-// --------------------------------------------------------------------
-
-TEST_F(FlagsUsageConfigTest, TestGetSetFlagsUsageConfig) {
-  EXPECT_TRUE(flags::GetUsageConfig().contains_helpshort_flags);
-  EXPECT_TRUE(flags::GetUsageConfig().contains_help_flags);
-  EXPECT_TRUE(flags::GetUsageConfig().contains_helppackage_flags);
-  EXPECT_TRUE(flags::GetUsageConfig().version_string);
-  EXPECT_TRUE(flags::GetUsageConfig().normalize_filename);
-
-  absl::FlagsUsageConfig empty_config;
-  empty_config.contains_helpshort_flags = &TstContainsHelpshortFlags;
-  empty_config.contains_help_flags = &TstContainsHelpFlags;
-  empty_config.contains_helppackage_flags = &TstContainsHelppackageFlags;
-  empty_config.version_string = &TstVersionString;
-  empty_config.normalize_filename = &TstNormalizeFilename;
-  absl::SetFlagsUsageConfig(empty_config);
-
-  EXPECT_TRUE(flags::GetUsageConfig().contains_helpshort_flags);
-  EXPECT_TRUE(flags::GetUsageConfig().contains_help_flags);
-  EXPECT_TRUE(flags::GetUsageConfig().contains_helppackage_flags);
-  EXPECT_TRUE(flags::GetUsageConfig().version_string);
-  EXPECT_TRUE(flags::GetUsageConfig().normalize_filename);
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(FlagsUsageConfigTest, TestContainsHelpshortFlags) {
-#if defined(_WIN32)
-  flags::SetProgramInvocationName("usage_config_test.exe");
-#else
-  flags::SetProgramInvocationName("usage_config_test");
-#endif
-
-  auto config = flags::GetUsageConfig();
-  EXPECT_TRUE(config.contains_helpshort_flags("adir/cd/usage_config_test.cc"));
-  EXPECT_TRUE(
-      config.contains_helpshort_flags("aaaa/usage_config_test-main.cc"));
-  EXPECT_TRUE(config.contains_helpshort_flags("abc/usage_config_test_main.cc"));
-  EXPECT_FALSE(config.contains_helpshort_flags("usage_config_main.cc"));
-
-  absl::FlagsUsageConfig empty_config;
-  empty_config.contains_helpshort_flags = &TstContainsHelpshortFlags;
-  absl::SetFlagsUsageConfig(empty_config);
-
-  EXPECT_TRUE(
-      flags::GetUsageConfig().contains_helpshort_flags("aaa/progname.cpp"));
-  EXPECT_FALSE(
-      flags::GetUsageConfig().contains_helpshort_flags("aaa/progmane.cpp"));
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(FlagsUsageConfigTest, TestContainsHelpFlags) {
-  flags::SetProgramInvocationName("usage_config_test");
-
-  auto config = flags::GetUsageConfig();
-  EXPECT_TRUE(config.contains_help_flags("zzz/usage_config_test.cc"));
-  EXPECT_TRUE(
-      config.contains_help_flags("bdir/a/zzz/usage_config_test-main.cc"));
-  EXPECT_TRUE(
-      config.contains_help_flags("//aqse/zzz/usage_config_test_main.cc"));
-  EXPECT_FALSE(config.contains_help_flags("zzz/aa/usage_config_main.cc"));
-
-  absl::FlagsUsageConfig empty_config;
-  empty_config.contains_help_flags = &TstContainsHelpFlags;
-  absl::SetFlagsUsageConfig(empty_config);
-
-  EXPECT_TRUE(flags::GetUsageConfig().contains_help_flags("zzz/main-body.c"));
-  EXPECT_FALSE(
-      flags::GetUsageConfig().contains_help_flags("zzz/dir/main-body.c"));
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(FlagsUsageConfigTest, TestContainsHelppackageFlags) {
-  flags::SetProgramInvocationName("usage_config_test");
-
-  auto config = flags::GetUsageConfig();
-  EXPECT_TRUE(config.contains_helppackage_flags("aaa/usage_config_test.cc"));
-  EXPECT_TRUE(
-      config.contains_helppackage_flags("bbdir/aaa/usage_config_test-main.cc"));
-  EXPECT_TRUE(config.contains_helppackage_flags(
-      "//aqswde/aaa/usage_config_test_main.cc"));
-  EXPECT_FALSE(config.contains_helppackage_flags("aadir/usage_config_main.cc"));
-
-  absl::FlagsUsageConfig empty_config;
-  empty_config.contains_helppackage_flags = &TstContainsHelppackageFlags;
-  absl::SetFlagsUsageConfig(empty_config);
-
-  EXPECT_TRUE(
-      flags::GetUsageConfig().contains_helppackage_flags("aaa/main-body.c"));
-  EXPECT_FALSE(
-      flags::GetUsageConfig().contains_helppackage_flags("aadir/main-body.c"));
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(FlagsUsageConfigTest, TestVersionString) {
-  flags::SetProgramInvocationName("usage_config_test");
-
-#ifdef NDEBUG
-  std::string expected_output = "usage_config_test\n";
-#else
-  std::string expected_output =
-      "usage_config_test\nDebug build (NDEBUG not #defined)\n";
-#endif
-
-  EXPECT_EQ(flags::GetUsageConfig().version_string(), expected_output);
-
-  absl::FlagsUsageConfig empty_config;
-  empty_config.version_string = &TstVersionString;
-  absl::SetFlagsUsageConfig(empty_config);
-
-  EXPECT_EQ(flags::GetUsageConfig().version_string(), "program 1.0.0");
-}
-
-// --------------------------------------------------------------------
-
-TEST_F(FlagsUsageConfigTest, TestNormalizeFilename) {
-  // This tests the default implementation.
-  EXPECT_EQ(flags::GetUsageConfig().normalize_filename("a/a.cc"), "a/a.cc");
-  EXPECT_EQ(flags::GetUsageConfig().normalize_filename("/a/a.cc"), "a/a.cc");
-  EXPECT_EQ(flags::GetUsageConfig().normalize_filename("///a/a.cc"), "a/a.cc");
-  EXPECT_EQ(flags::GetUsageConfig().normalize_filename("/"), "");
-
-  // This tests that the custom implementation is called.
-  absl::FlagsUsageConfig empty_config;
-  empty_config.normalize_filename = &TstNormalizeFilename;
-  absl::SetFlagsUsageConfig(empty_config);
-
-  EXPECT_EQ(flags::GetUsageConfig().normalize_filename("a/a.cc"), "a.cc");
-  EXPECT_EQ(flags::GetUsageConfig().normalize_filename("aaa/a.cc"), "a/a.cc");
-
-  // This tests that the default implementation is called.
-  empty_config.normalize_filename = nullptr;
-  absl::SetFlagsUsageConfig(empty_config);
-
-  EXPECT_EQ(flags::GetUsageConfig().normalize_filename("a/a.cc"), "a/a.cc");
-  EXPECT_EQ(flags::GetUsageConfig().normalize_filename("/a/a.cc"), "a/a.cc");
-  EXPECT_EQ(flags::GetUsageConfig().normalize_filename("///a/a.cc"), "a/a.cc");
-  EXPECT_EQ(flags::GetUsageConfig().normalize_filename("\\a\\a.cc"), "a\\a.cc");
-  EXPECT_EQ(flags::GetUsageConfig().normalize_filename("//"), "");
-  EXPECT_EQ(flags::GetUsageConfig().normalize_filename("\\\\"), "");
-}
-
-}  // namespace