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diff --git a/third_party/abseil_cpp/CMakeLists.txt b/third_party/abseil_cpp/CMakeLists.txt
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-#
-# Copyright 2017 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.
-#
-
-# Most widely used distributions have cmake 3.5 or greater available as of March
-# 2019.  A notable exception is RHEL-7 (CentOS7).  You can install a current
-# version of CMake by first installing Extra Packages for Enterprise Linux
-# (https://fedoraproject.org/wiki/EPEL#Extra_Packages_for_Enterprise_Linux_.28EPEL.29)
-# and then issuing `yum install cmake3` on the command line.
-cmake_minimum_required(VERSION 3.5)
-
-# Compiler id for Apple Clang is now AppleClang.
-if (POLICY CMP0025)
-  cmake_policy(SET CMP0025 NEW)
-endif (POLICY CMP0025)
-
-# if command can use IN_LIST
-if (POLICY CMP0057)
-  cmake_policy(SET CMP0057 NEW)
-endif (POLICY CMP0057)
-
-# Project version variables are the empty string if version is unspecified
-if (POLICY CMP0048)
-  cmake_policy(SET CMP0048 NEW)
-endif (POLICY CMP0048)
-
-# option() honor variables
-if (POLICY CMP0077)
-  cmake_policy(SET CMP0077 NEW)
-endif (POLICY CMP0077)
-
-project(absl CXX)
-
-# Output directory is correct by default for most build setups. However, when
-# building Abseil as a DLL, it is important to have the DLL in the same
-# directory as the executable using it. Thus, we put all executables in a single
-# /bin directory.
-set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
-
-# when absl is included as subproject (i.e. using add_subdirectory(abseil-cpp))
-# in the source tree of a project that uses it, install rules are disabled.
-if(NOT "^${CMAKE_SOURCE_DIR}$" STREQUAL "^${PROJECT_SOURCE_DIR}$")
-  option(ABSL_ENABLE_INSTALL "Enable install rule" OFF)
-else()
-  option(ABSL_ENABLE_INSTALL "Enable install rule" ON)
-endif()
-
-list(APPEND CMAKE_MODULE_PATH
-  ${CMAKE_CURRENT_LIST_DIR}/CMake
-  ${CMAKE_CURRENT_LIST_DIR}/absl/copts
-)
-
-# Linking Abseil to shared libraries (such as Nix) requires PIC.
-set(CMAKE_POSITION_INDEPENDENT_CODE TRUE)
-
-include(AbseilInstallDirs)
-include(CMakePackageConfigHelpers)
-include(AbseilDll)
-include(AbseilHelpers)
-
-
-##
-## Using absl targets
-##
-## all public absl targets are
-## exported with the absl:: prefix
-##
-## e.g absl::base absl::synchronization absl::strings ....
-##
-## DO NOT rely on the internal targets outside of the prefix
-
-
-# include current path
-list(APPEND ABSL_COMMON_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR})
-
-if("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
-  set(ABSL_USING_CLANG ON)
-else()
-  set(ABSL_USING_CLANG OFF)
-endif()
-
-# find dependencies
-## pthread
-find_package(Threads REQUIRED)
-
-option(ABSL_USE_EXTERNAL_GOOGLETEST
-  "If ON, Abseil will assume that the targets for GoogleTest are already provided by the including project. This makes sense when Abseil is used with add_subproject." OFF)
-
-option(ABSL_USE_GOOGLETEST_HEAD
-  "If ON, abseil will download HEAD from GoogleTest at config time." OFF)
-
-set(ABSL_GOOGLETEST_DOWNLOAD_URL "" CACHE STRING "If set, download GoogleTest from this URL")
-
-set(ABSL_LOCAL_GOOGLETEST_DIR "/usr/src/googletest" CACHE PATH
-  "If ABSL_USE_GOOGLETEST_HEAD is OFF and ABSL_GOOGLETEST_URL is not set, specifies the directory of a local GoogleTest checkout."
-  )
-
-option(ABSL_RUN_TESTS "If ON, Abseil tests will be run." OFF)
-
-if(${ABSL_RUN_TESTS})
-  # enable CTest.  This will set BUILD_TESTING to ON unless otherwise specified
-  # on the command line
-  include(CTest)
-
-  ## check targets
-  if (NOT ABSL_USE_EXTERNAL_GOOGLETEST)
-    set(absl_gtest_build_dir ${CMAKE_BINARY_DIR}/googletest-build)
-    if(ABSL_USE_GOOGLETEST_HEAD AND ABSL_GOOGLETEST_DOWNLOAD_URL)
-      message(FATAL_ERROR "Do not set both ABSL_USE_GOOGLETEST_HEAD and ABSL_GOOGLETEST_DOWNLOAD_URL")
-    endif()
-    if(ABSL_USE_GOOGLETEST_HEAD)
-      set(absl_gtest_download_url "https://github.com/google/googletest/archive/master.zip")
-    elseif(ABSL_GOOGLETEST_DOWNLOAD_URL)
-      set(absl_gtest_download_url ${ABSL_GOOGLETEST_DOWNLOAD_URL})
-    endif()
-    if(absl_gtest_download_url)
-      set(absl_gtest_src_dir ${CMAKE_BINARY_DIR}/googletest-src)
-    else()
-      set(absl_gtest_src_dir ${ABSL_LOCAL_GOOGLETEST_DIR})
-    endif()
-    include(CMake/Googletest/DownloadGTest.cmake)
-  endif()
-
-  check_target(gtest)
-  check_target(gtest_main)
-  check_target(gmock)
-
-  list(APPEND ABSL_TEST_COMMON_LIBRARIES
-    gtest_main
-    gtest
-    gmock
-    ${CMAKE_THREAD_LIBS_INIT}
-  )
-endif()
-
-add_subdirectory(absl)
-
-if(ABSL_ENABLE_INSTALL)
-  # absl:lts-remove-begin(system installation is supported for LTS releases)
-  # We don't support system-wide installation
-  list(APPEND SYSTEM_INSTALL_DIRS "/usr/local" "/usr" "/opt/" "/opt/local" "c:/Program Files/${PROJECT_NAME}")
-  if(NOT DEFINED CMAKE_INSTALL_PREFIX OR CMAKE_INSTALL_PREFIX IN_LIST SYSTEM_INSTALL_DIRS)
-    message(WARNING "\
-  The default and system-level install directories are unsupported except in LTS \
-  releases of Abseil.  Please set CMAKE_INSTALL_PREFIX to install Abseil in your \
-  source or build tree directly.\
-    ")
-  endif()
-  # absl:lts-remove-end
-
-  # install as a subdirectory only
-  install(EXPORT ${PROJECT_NAME}Targets
-    NAMESPACE absl::
-    DESTINATION "${ABSL_INSTALL_CONFIGDIR}"
-  )
-
-  configure_package_config_file(
-    CMake/abslConfig.cmake.in
-    "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
-    INSTALL_DESTINATION "${ABSL_INSTALL_CONFIGDIR}"
-  )
-  install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
-    DESTINATION "${ABSL_INSTALL_CONFIGDIR}"
-  )
-
-  # Abseil only has a version in LTS releases.  This mechanism is accomplished
-  # Abseil's internal Copybara (https://github.com/google/copybara) workflows and
-  # isn't visible in the CMake buildsystem itself.
-  if(absl_VERSION)
-    write_basic_package_version_file(
-      "${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
-      COMPATIBILITY ExactVersion
-    )
-
-    install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
-      DESTINATION ${ABSL_INSTALL_CONFIGDIR}
-    )
-  endif()  # absl_VERSION
-
-  install(DIRECTORY absl
-    DESTINATION ${ABSL_INSTALL_INCLUDEDIR}
-    FILES_MATCHING
-      PATTERN "*.inc"
-      PATTERN "*.h"
-      PATTERN "copts" EXCLUDE
-      PATTERN "testdata" EXCLUDE
-    )
-endif()  # ABSL_ENABLE_INSTALL