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-rw-r--r--absl/base/BUILD.bazel3
-rw-r--r--absl/base/CMakeLists.txt1
-rw-r--r--absl/base/config.h63
-rw-r--r--absl/base/internal/endian.h8
-rw-r--r--absl/base/options.h188
-rw-r--r--absl/container/flat_hash_map_test.cc4
-rw-r--r--absl/container/internal/inlined_vector.h29
-rw-r--r--absl/container/internal/raw_hash_set.h2
-rw-r--r--absl/meta/type_traits.h14
-rw-r--r--absl/random/internal/nonsecure_base_test.cc7
-rw-r--r--absl/random/log_uniform_int_distribution.h16
-rw-r--r--absl/strings/numbers.h13
-rw-r--r--absl/strings/str_cat.cc26
-rw-r--r--absl/strings/str_format.h6
-rw-r--r--absl/strings/string_view.cc4
-rw-r--r--absl/strings/string_view.h6
-rw-r--r--absl/strings/string_view_test.cc12
-rw-r--r--absl/synchronization/internal/waiter.cc56
-rw-r--r--absl/synchronization/internal/waiter.h7
-rw-r--r--absl/synchronization/lifetime_test.cc6
-rw-r--r--absl/time/civil_time.h2
-rw-r--r--absl/time/duration.cc4
-rw-r--r--absl/time/time.h4
-rw-r--r--absl/types/any.h6
-rw-r--r--absl/types/any_exception_safety_test.cc4
-rw-r--r--absl/types/any_test.cc10
-rw-r--r--absl/types/bad_any_cast.cc4
-rw-r--r--absl/types/bad_any_cast.h6
-rw-r--r--absl/types/bad_optional_access.cc4
-rw-r--r--absl/types/bad_optional_access.h6
-rw-r--r--absl/types/bad_variant_access.cc4
-rw-r--r--absl/types/bad_variant_access.h6
-rw-r--r--absl/types/internal/variant.h4
-rw-r--r--absl/types/optional.h6
-rw-r--r--absl/types/optional_exception_safety_test.cc4
-rw-r--r--absl/types/optional_test.cc20
-rw-r--r--absl/types/variant.h6
-rw-r--r--absl/types/variant_exception_safety_test.cc16
-rw-r--r--absl/types/variant_test.cc34
-rw-r--r--absl/utility/utility.h14
40 files changed, 451 insertions, 184 deletions
diff --git a/absl/base/BUILD.bazel b/absl/base/BUILD.bazel
index ffeca630706e..6fc712d968f3 100644
--- a/absl/base/BUILD.bazel
+++ b/absl/base/BUILD.bazel
@@ -87,6 +87,7 @@ cc_library(
     name = "config",
     hdrs = [
         "config.h",
+        "options.h",
         "policy_checks.h",
     ],
     copts = ABSL_DEFAULT_COPTS,
@@ -137,7 +138,7 @@ cc_library(
         "//conditions:default": ["-pthread"],
     }) + ABSL_DEFAULT_LINKOPTS,
     visibility = [
-        "//absl:__subpackages__",
+        "//visibility:public",
     ],
     deps = [
         ":base",
diff --git a/absl/base/CMakeLists.txt b/absl/base/CMakeLists.txt
index 2698213c566d..9550cdb2db49 100644
--- a/absl/base/CMakeLists.txt
+++ b/absl/base/CMakeLists.txt
@@ -75,6 +75,7 @@ absl_cc_library(
     config
   HDRS
     "config.h"
+    "options.h"
     "policy_checks.h"
   COPTS
     ${ABSL_DEFAULT_COPTS}
diff --git a/absl/base/config.h b/absl/base/config.h
index 24851fa33ce4..46a84f1a76f6 100644
--- a/absl/base/config.h
+++ b/absl/base/config.h
@@ -63,6 +63,7 @@
 #include <TargetConditionals.h>
 #endif
 
+#include "absl/base/options.h"
 #include "absl/base/policy_checks.h"
 
 // -----------------------------------------------------------------------------
@@ -468,6 +469,68 @@
 #define ABSL_HAVE_STD_STRING_VIEW 1
 #endif
 
+// ABSL_USES_STD_ANY
+//
+// Indicates whether absl::any is an alias for std::any.
+#if !defined(ABSL_OPTION_USE_STD_ANY)
+#error options.h is misconfigured.
+#elif ABSL_OPTION_USE_STD_ANY == 0 || \
+    (ABSL_OPTION_USE_STD_ANY == 2 && !defined(ABSL_HAVE_STD_ANY))
+#undef ABSL_USES_STD_ANY
+#elif ABSL_OPTION_USE_STD_ANY == 1 || \
+    (ABSL_OPTION_USE_STD_ANY == 2 && defined(ABSL_HAVE_STD_ANY))
+#define ABSL_USES_STD_ANY 1
+#else
+#error options.h is misconfigured.
+#endif
+
+// ABSL_USES_STD_OPTIONAL
+//
+// Indicates whether absl::optional is an alias for std::optional.
+#if !defined(ABSL_OPTION_USE_STD_OPTIONAL)
+#error options.h is misconfigured.
+#elif ABSL_OPTION_USE_STD_OPTIONAL == 0 || \
+    (ABSL_OPTION_USE_STD_OPTIONAL == 2 && !defined(ABSL_HAVE_STD_OPTIONAL))
+#undef ABSL_USES_STD_OPTIONAL
+#elif ABSL_OPTION_USE_STD_OPTIONAL == 1 || \
+    (ABSL_OPTION_USE_STD_OPTIONAL == 2 && defined(ABSL_HAVE_STD_OPTIONAL))
+#define ABSL_USES_STD_OPTIONAL 1
+#else
+#error options.h is misconfigured.
+#endif
+
+// ABSL_USES_STD_VARIANT
+//
+// Indicates whether absl::variant is an alias for std::variant.
+#if !defined(ABSL_OPTION_USE_STD_VARIANT)
+#error options.h is misconfigured.
+#elif ABSL_OPTION_USE_STD_VARIANT == 0 || \
+    (ABSL_OPTION_USE_STD_VARIANT == 2 && !defined(ABSL_HAVE_STD_VARIANT))
+#undef ABSL_USES_STD_VARIANT
+#elif ABSL_OPTION_USE_STD_VARIANT == 1 || \
+    (ABSL_OPTION_USE_STD_VARIANT == 2 && defined(ABSL_HAVE_STD_VARIANT))
+#define ABSL_USES_STD_VARIANT 1
+#else
+#error options.h is misconfigured.
+#endif
+
+// ABSL_USES_STD_STRING_VIEW
+//
+// Indicates whether absl::string_view is an alias for std::string_view.
+#if !defined(ABSL_OPTION_USE_STD_STRING_VIEW)
+#error options.h is misconfigured.
+#elif ABSL_OPTION_USE_STD_STRING_VIEW == 0 || \
+    (ABSL_OPTION_USE_STD_STRING_VIEW == 2 &&  \
+     !defined(ABSL_HAVE_STD_STRING_VIEW))
+#undef ABSL_USES_STD_STRING_VIEW
+#elif ABSL_OPTION_USE_STD_STRING_VIEW == 1 || \
+    (ABSL_OPTION_USE_STD_STRING_VIEW == 2 &&  \
+     defined(ABSL_HAVE_STD_STRING_VIEW))
+#define ABSL_USES_STD_STRING_VIEW 1
+#else
+#error options.h is misconfigured.
+#endif
+
 // In debug mode, MSVC 2017's std::variant throws a EXCEPTION_ACCESS_VIOLATION
 // SEH exception from emplace for variant<SomeStruct> when constructing the
 // struct can throw. This defeats some of variant_test and
diff --git a/absl/base/internal/endian.h b/absl/base/internal/endian.h
index b43c9a46ee35..8233cb52433b 100644
--- a/absl/base/internal/endian.h
+++ b/absl/base/internal/endian.h
@@ -19,9 +19,6 @@
 // The following guarantees declaration of the byte swap functions
 #ifdef _MSC_VER
 #include <stdlib.h>  // NOLINT(build/include)
-#elif defined(__APPLE__)
-// macOS / Darwin features
-#include <libkern/OSByteOrder.h>
 #elif defined(__FreeBSD__)
 #include <sys/endian.h>
 #elif defined(__GLIBC__)
@@ -63,11 +60,6 @@ inline uint16_t gbswap_16(uint16_t host_int) {
   return _byteswap_ushort(host_int);
 }
 
-#elif defined(__APPLE__)
-inline uint64_t gbswap_64(uint64_t host_int) { return OSSwapInt16(host_int); }
-inline uint32_t gbswap_32(uint32_t host_int) { return OSSwapInt32(host_int); }
-inline uint16_t gbswap_16(uint16_t host_int) { return OSSwapInt64(host_int); }
-
 #else
 inline uint64_t gbswap_64(uint64_t host_int) {
 #if defined(__GNUC__) && defined(__x86_64__) && !defined(__APPLE__)
diff --git a/absl/base/options.h b/absl/base/options.h
new file mode 100644
index 000000000000..3961e63f4e2a
--- /dev/null
+++ b/absl/base/options.h
@@ -0,0 +1,188 @@
+#ifndef ABSL_BASE_OPTIONS_H_
+#define ABSL_BASE_OPTIONS_H_
+
+// 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: options.h
+// -----------------------------------------------------------------------------
+//
+// This file contains Abseil configuration options for setting specific
+// implementations instead of letting Abseil determine which implementation to
+// use at compile-time. Setting these options may be useful for package or build
+// managers who wish to guarantee ABI stability within binary builds (which are
+// otherwise difficult to enforce).
+//
+// *** IMPORTANT NOTICE FOR PACKAGE MANAGERS:  It is important that
+// maintainers of package managers who wish to package Abseil read and
+// understand this file! ***
+//
+// Abseil contains a number of possible configuration endpoints, based on
+// parameters such as the detected platform, language version, or command-line
+// flags used to invoke the underlying binary. As is the case with all
+// libraries, binaries which contain Abseil code must ensure that separate
+// packages use the same compiled copy of Abseil to avoid a diamond dependency
+// problem, which can occur if two packages built with different Abseil
+// configuration settings are linked together. Diamond dependency problems in
+// C++ may manifest as violations to the One Definition Rule (ODR) (resulting in
+// linker errors), or undefined behavior (resulting in crashes).
+//
+// Diamond dependency problems can be avoided if all packages utilize the same
+// exact version of Abseil. Building from source code with the same compilation
+// parameters is the easiest way to avoid such dependency problems. However, for
+// package managers who cannot control such compilation parameters, we are
+// providing the file to allow you to inject ABI (Application Binary Interface)
+// stability across builds. Settings options in this file will neither change
+// API nor ABI, providing a stable copy of Abseil between packages.
+//
+// Care must be taken to keep options within these configurations isolated
+// from any other dynamic settings, such as command-line flags which could alter
+// these options. This file is provided specifically to help build and package
+// managers provide a stable copy of Abseil within their libraries and binaries;
+// other developers should not have need to alter the contents of this file.
+//
+// -----------------------------------------------------------------------------
+// Usage
+// -----------------------------------------------------------------------------
+//
+// For any particular package release, set the appropriate definitions within
+// this file to whatever value makes the most sense for your package(s). Note
+// that, by default, most of these options, at the moment, affect the
+// implementation of types; future options may affect other implementation
+// details.
+//
+// NOTE: the defaults within this file all assume that Abseil can select the
+// proper Abseil implementation at compile-time, which will not be sufficient
+// to guarantee ABI stability to package managers.
+//
+// -----------------------------------------------------------------------------
+// Type Compatibility Options
+// -----------------------------------------------------------------------------
+//
+// ABSL_OPTION_USE_STD_ANY
+//
+// This option controls whether absl::any is implemented as an alias to
+// std::any, or as an independent implementation.
+//
+// A value of 0 means to use Abseil's implementation.  This requires only C++11
+// support, and is expected to work on every toolchain we support.
+//
+// A value of 1 means to use an alias to std::any.  This requires that all code
+// using Abseil is built in C++17 mode or later.
+//
+// A value of 2 means to detect the C++ version being used to compile Abseil,
+// and use an alias only if a working std::any is available.  This option is
+// useful when you are building your entire program, including all of its
+// dependencies, from source.  It should not be used otherwise -- for example,
+// if you are distributing Abseil in a binary package manager -- since in
+// mode 2, absl::any will name a different type, with a different mangled name
+// and binary layout, depending on the compiler flags passed by the end user.
+// For more info, see https://abseil.io/about/design/dropin-types.
+//
+// User code should not inspect this macro.  To check in the preprocessor if
+// absl::any is a typedef of std::any, use the feature macro ABSL_USES_STD_ANY.
+
+#define ABSL_OPTION_USE_STD_ANY 2
+
+
+// ABSL_OPTION_USE_STD_OPTIONAL
+//
+// This option controls whether absl::optional is implemented as an alias to
+// std::optional, or as an independent implementation.
+//
+// A value of 0 means to use Abseil's implementation.  This requires only C++11
+// support, and is expected to work on every toolchain we support.
+//
+// A value of 1 means to use an alias to std::optional.  This requires that all
+// code using Abseil is built in C++17 mode or later.
+//
+// A value of 2 means to detect the C++ version being used to compile Abseil,
+// and use an alias only if a working std::optional is available.  This option
+// is useful when you are building your program from source.  It should not be
+// used otherwise -- for example, if you are distributing Abseil in a binary
+// package manager -- since in mode 2, absl::optional will name a different
+// type, with a different mangled name and binary layout, depending on the
+// compiler flags passed by the end user.  For more info, see
+// https://abseil.io/about/design/dropin-types.
+
+// A value of 2 means to detect the C++ version being used to compile Abseil,
+// and use an alias only if a working std::optional is available.  This option
+// should not be used when your program is not built from source -- for example,
+// if you are distributing Abseil in a binary package manager -- since in mode
+// 2, absl::optional will name a different template class, with a different
+// mangled name and binary layout, depending on the compiler flags passed by the
+// end user.
+//
+// User code should not inspect this macro.  To check in the preprocessor if
+// absl::optional is a typedef of std::optional, use the feature macro
+// ABSL_USES_STD_OPTIONAL.
+
+#define ABSL_OPTION_USE_STD_OPTIONAL 2
+
+
+// ABSL_OPTION_USE_STD_STRING_VIEW
+//
+// This option controls whether absl::string_view is implemented as an alias to
+// std::string_view, or as an independent implementation.
+//
+// A value of 0 means to use Abseil's implementation.  This requires only C++11
+// support, and is expected to work on every toolchain we support.
+//
+// A value of 1 means to use an alias to std::string_view.  This requires that
+// all code using Abseil is built in C++17 mode or later.
+//
+// A value of 2 means to detect the C++ version being used to compile Abseil,
+// and use an alias only if a working std::string_view is available.  This
+// option is useful when you are building your program from source.  It should
+// not be used otherwise -- for example, if you are distributing Abseil in a
+// binary package manager -- since in mode 2, absl::string_view will name a
+// different type, with a different mangled name and binary layout, depending on
+// the compiler flags passed by the end user.  For more info, see
+// https://abseil.io/about/design/dropin-types.
+//
+// User code should not inspect this macro.  To check in the preprocessor if
+// absl::string_view is a typedef of std::string_view, use the feature macro
+// ABSL_USES_STD_STRING_VIEW.
+
+#define ABSL_OPTION_USE_STD_STRING_VIEW 2
+
+
+// ABSL_OPTION_USE_STD_VARIANT
+//
+// This option controls whether absl::variant is implemented as an alias to
+// std::variant, or as an independent implementation.
+//
+// A value of 0 means to use Abseil's implementation.  This requires only C++11
+// support, and is expected to work on every toolchain we support.
+//
+// A value of 1 means to use an alias to std::variant.  This requires that all
+// code using Abseil is built in C++17 mode or later.
+//
+// A value of 2 means to detect the C++ version being used to compile Abseil,
+// and use an alias only if a working std::variant is available.  This option
+// is useful when you are building your program from source.  It should not be
+// used otherwise -- for example, if you are distributing Abseil in a binary
+// package manager -- since in mode 2, absl::variant will name a different
+// type, with a different mangled name and binary layout, depending on the
+// compiler flags passed by the end user.  For more info, see
+// https://abseil.io/about/design/dropin-types.
+//
+// User code should not inspect this macro.  To check in the preprocessor if
+// absl::variant is a typedef of std::variant, use the feature macro
+// ABSL_USES_STD_VARIANT.
+
+#define ABSL_OPTION_USE_STD_VARIANT 2
+
+#endif  // ABSL_BASE_OPTIONS_H_
diff --git a/absl/container/flat_hash_map_test.cc b/absl/container/flat_hash_map_test.cc
index 6cff1a25716f..02d1f879dae1 100644
--- a/absl/container/flat_hash_map_test.cc
+++ b/absl/container/flat_hash_map_test.cc
@@ -214,7 +214,7 @@ TEST(FlatHashMap, MergeExtractInsert) {
   EXPECT_THAT(m, UnorderedElementsAre(Pair(1, 17), Pair(2, 9)));
 }
 
-#if (defined(ABSL_HAVE_STD_ANY) || !defined(_LIBCPP_VERSION)) && \
+#if (defined(ABSL_USES_STD_ANY) || !defined(_LIBCPP_VERSION)) && \
     !defined(__EMSCRIPTEN__)
 TEST(FlatHashMap, Any) {
   absl::flat_hash_map<int, absl::any> m;
@@ -246,7 +246,7 @@ TEST(FlatHashMap, Any) {
   ASSERT_NE(it2, m2.end());
   EXPECT_EQ(7, it2->second);
 }
-#endif  // (defined(ABSL_HAVE_STD_ANY) || !defined(_LIBCPP_VERSION)) &&
+#endif  // (defined(ABSL_USES_STD_ANY) || !defined(_LIBCPP_VERSION)) &&
         // !defined(__EMSCRIPTEN__)
 
 }  // namespace
diff --git a/absl/container/internal/inlined_vector.h b/absl/container/internal/inlined_vector.h
index 7d08f7e306e4..f678c88dafd5 100644
--- a/absl/container/internal/inlined_vector.h
+++ b/absl/container/internal/inlined_vector.h
@@ -471,12 +471,9 @@ auto Storage<T, N, A>::Initialize(ValueAdapter values, size_type new_size)
     // safe to take on the allocation with size `0`. If `ConstructElements(...)`
     // throws, deallocation will be automatically handled by `~Storage()`.
     size_type new_capacity = ComputeCapacity(GetInlinedCapacity(), new_size);
-    pointer new_data = AllocatorTraits::allocate(*GetAllocPtr(), new_capacity);
-
-    SetAllocatedData(new_data, new_capacity);
+    construct_data = AllocatorTraits::allocate(*GetAllocPtr(), new_capacity);
+    SetAllocatedData(construct_data, new_capacity);
     SetIsAllocated();
-
-    construct_data = new_data;
   } else {
     construct_data = GetInlinedData();
   }
@@ -503,9 +500,7 @@ auto Storage<T, N, A>::Assign(ValueAdapter values, size_type new_size) -> void {
 
   if (new_size > storage_view.capacity) {
     size_type new_capacity = ComputeCapacity(storage_view.capacity, new_size);
-    pointer new_data = allocation_tx.Allocate(new_capacity);
-
-    construct_loop = {new_data, new_size};
+    construct_loop = {allocation_tx.Allocate(new_capacity), new_size};
     destroy_loop = {storage_view.data, storage_view.size};
   } else if (new_size > storage_view.size) {
     assign_loop = {storage_view.data, storage_view.size};
@@ -552,7 +547,6 @@ auto Storage<T, N, A>::Resize(ValueAdapter values, size_type new_size) -> void {
   if (new_size > storage_view.capacity) {
     size_type new_capacity = ComputeCapacity(storage_view.capacity, new_size);
     pointer new_data = allocation_tx.Allocate(new_capacity);
-
     construct_loop = {new_data + storage_view.size,
                       new_size - storage_view.size};
     move_construct_loop = {new_data, storage_view.size};
@@ -690,14 +684,14 @@ auto Storage<T, N, A>::EmplaceBack(Args&&... args) -> reference {
   pointer construct_data;
   if (storage_view.size == storage_view.capacity) {
     size_type new_capacity = NextCapacity(storage_view.capacity);
-    pointer new_data = allocation_tx.Allocate(new_capacity);
-
-    construct_data = new_data;
+    construct_data = allocation_tx.Allocate(new_capacity);
   } else {
     construct_data = storage_view.data;
   }
 
-  AllocatorTraits::construct(*GetAllocPtr(), construct_data + storage_view.size,
+  pointer last_ptr = construct_data + storage_view.size;
+
+  AllocatorTraits::construct(*GetAllocPtr(), last_ptr,
                              std::forward<Args>(args)...);
 
   if (allocation_tx.DidAllocate()) {
@@ -707,8 +701,7 @@ auto Storage<T, N, A>::EmplaceBack(Args&&... args) -> reference {
           storage_view.size);
     }
     ABSL_INTERNAL_CATCH_ANY {
-      AllocatorTraits::destroy(*GetAllocPtr(),
-                               construct_data + storage_view.size);
+      AllocatorTraits::destroy(*GetAllocPtr(), last_ptr);
       ABSL_INTERNAL_RETHROW;
     }
 
@@ -721,7 +714,7 @@ auto Storage<T, N, A>::EmplaceBack(Args&&... args) -> reference {
   }
 
   AddSize(1);
-  return *(construct_data + storage_view.size);
+  return *last_ptr;
 }
 
 template <typename T, size_t N, typename A>
@@ -793,9 +786,7 @@ auto Storage<T, N, A>::ShrinkToFit() -> void {
   pointer construct_data;
   if (storage_view.size > GetInlinedCapacity()) {
     size_type new_capacity = storage_view.size;
-    pointer new_data = allocation_tx.Allocate(new_capacity);
-
-    construct_data = new_data;
+    construct_data = allocation_tx.Allocate(new_capacity);
   } else {
     construct_data = GetInlinedData();
   }
diff --git a/absl/container/internal/raw_hash_set.h b/absl/container/internal/raw_hash_set.h
index 9992ba4b8ac0..9079a73e52a6 100644
--- a/absl/container/internal/raw_hash_set.h
+++ b/absl/container/internal/raw_hash_set.h
@@ -668,7 +668,7 @@ class raw_hash_set {
     }
 
     ctrl_t* ctrl_ = nullptr;
-    // To avoid uninitialized member warnigs, put slot_ in an anonymous union.
+    // To avoid uninitialized member warnings, put slot_ in an anonymous union.
     // The member is not initialized on singleton and end iterators.
     union {
       slot_type* slot_;
diff --git a/absl/meta/type_traits.h b/absl/meta/type_traits.h
index 76959cdef602..d57a87923136 100644
--- a/absl/meta/type_traits.h
+++ b/absl/meta/type_traits.h
@@ -145,6 +145,18 @@ using IsMoveAssignableImpl = decltype(std::declval<T&>() = std::declval<T&&>());
 
 }  // namespace type_traits_internal
 
+// MSVC 19.20 has a regression that causes our workarounds to fail, but their
+// std forms now appear to be compliant.
+#if defined(_MSC_VER) && !defined(__clang__) && (_MSC_VER >= 1920)
+
+template <typename T>
+using is_copy_assignable = std::is_copy_assignable<T>;
+
+template <typename T>
+using is_move_assignable = std::is_move_assignable<T>;
+
+#else
+
 template <typename T>
 struct is_copy_assignable : type_traits_internal::is_detected<
                                 type_traits_internal::IsCopyAssignableImpl, T> {
@@ -155,6 +167,8 @@ struct is_move_assignable : type_traits_internal::is_detected<
                                 type_traits_internal::IsMoveAssignableImpl, T> {
 };
 
+#endif
+
 // void_t()
 //
 // Ignores the type of any its arguments and returns `void`. In general, this
diff --git a/absl/random/internal/nonsecure_base_test.cc b/absl/random/internal/nonsecure_base_test.cc
index d9de99019ce0..698027fc6e0d 100644
--- a/absl/random/internal/nonsecure_base_test.cc
+++ b/absl/random/internal/nonsecure_base_test.cc
@@ -154,9 +154,10 @@ TEST(NonsecureURBGBase, CompatibleWithDistributionUtils) {
 TEST(NonsecureURBGBase, CompatibleWithStdDistributions) {
   ExampleNonsecureURBG rbg;
 
-  std::uniform_int_distribution<uint32_t>(0, 100)(rbg);
-  std::uniform_real_distribution<float>()(rbg);
-  std::bernoulli_distribution(0.2)(rbg);
+  // Cast to void to suppress [[nodiscard]] warnings
+  static_cast<void>(std::uniform_int_distribution<uint32_t>(0, 100)(rbg));
+  static_cast<void>(std::uniform_real_distribution<float>()(rbg));
+  static_cast<void>(std::bernoulli_distribution(0.2)(rbg));
 }
 
 TEST(NonsecureURBGBase, ConsecutiveDefaultInstancesYieldUniqueVariates) {
diff --git a/absl/random/log_uniform_int_distribution.h b/absl/random/log_uniform_int_distribution.h
index 956a69070ccd..de58bdbe14ca 100644
--- a/absl/random/log_uniform_int_distribution.h
+++ b/absl/random/log_uniform_int_distribution.h
@@ -192,13 +192,15 @@ log_uniform_int_distribution<IntType>::Generate(
     const double r = std::pow(p.base(), d);
     const double s = (r * p.base()) - 1.0;
 
-    base_e = (r > (std::numeric_limits<unsigned_type>::max)())
-                 ? (std::numeric_limits<unsigned_type>::max)()
-                 : static_cast<unsigned_type>(r);
-
-    top_e = (s > (std::numeric_limits<unsigned_type>::max)())
-                ? (std::numeric_limits<unsigned_type>::max)()
-                : static_cast<unsigned_type>(s);
+    base_e =
+        (r > static_cast<double>((std::numeric_limits<unsigned_type>::max)()))
+            ? (std::numeric_limits<unsigned_type>::max)()
+            : static_cast<unsigned_type>(r);
+
+    top_e =
+        (s > static_cast<double>((std::numeric_limits<unsigned_type>::max)()))
+            ? (std::numeric_limits<unsigned_type>::max)()
+            : static_cast<unsigned_type>(s);
   }
 
   const unsigned_type lo = (base_e >= p.range()) ? p.range() : base_e;
diff --git a/absl/strings/numbers.h b/absl/strings/numbers.h
index 745de67ad86d..9b8ec89a8941 100644
--- a/absl/strings/numbers.h
+++ b/absl/strings/numbers.h
@@ -37,7 +37,14 @@
 #include <type_traits>
 
 #include "absl/base/internal/bits.h"
+#ifdef __SSE4_2__
+// TODO(jorg): Remove this when we figure out the right way
+// to swap bytes on SSE 4.2 that works with the compilers
+// we claim to support.  Also, add tests for the compiler
+// that doesn't support the Intel _bswap64 intrinsic but
+// does support all the SSE 4.2 intrinsics
 #include "absl/base/internal/endian.h"
+#endif
 #include "absl/base/macros.h"
 #include "absl/base/port.h"
 #include "absl/numeric/int128.h"
@@ -189,12 +196,12 @@ ABSL_MUST_USE_RESULT bool safe_strtoi_base(absl::string_view s, int_type* out,
 // Returns the number of non-pad digits of the output (it can never be zero
 // since 0 has one digit).
 inline size_t FastHexToBufferZeroPad16(uint64_t val, char* out) {
-  uint64_t be = absl::big_endian::FromHost64(val);
 #ifdef __SSE4_2__
+  uint64_t be = absl::big_endian::FromHost64(val);
   const auto kNibbleMask = _mm_set1_epi8(0xf);
   const auto kHexDigits = _mm_setr_epi8('0', '1', '2', '3', '4', '5', '6', '7',
                                         '8', '9', 'a', 'b', 'c', 'd', 'e', 'f');
-  auto v = _mm_loadu_si64(reinterpret_cast<__m128i*>(&be));  // load lo dword
+  auto v = _mm_loadl_epi64(reinterpret_cast<__m128i*>(&be));  // load lo dword
   auto v4 = _mm_srli_epi64(v, 4);                            // shift 4 right
   auto il = _mm_unpacklo_epi8(v4, v);                        // interleave bytes
   auto m = _mm_and_si128(il, kNibbleMask);                   // mask out nibbles
@@ -202,7 +209,7 @@ inline size_t FastHexToBufferZeroPad16(uint64_t val, char* out) {
   _mm_storeu_si128(reinterpret_cast<__m128i*>(out), hexchars);
 #else
   for (int i = 0; i < 8; ++i) {
-    auto byte = (be >> (8 * i)) & 0xFF;
+    auto byte = (val >> (56 - 8 * i)) & 0xFF;
     auto* hex = &absl::numbers_internal::kHexTable[byte * 2];
     std::memcpy(out + 2 * i, hex, 2);
   }
diff --git a/absl/strings/str_cat.cc b/absl/strings/str_cat.cc
index d587789972e4..4bd56f5f4386 100644
--- a/absl/strings/str_cat.cc
+++ b/absl/strings/str_cat.cc
@@ -27,23 +27,21 @@
 namespace absl {
 
 AlphaNum::AlphaNum(Hex hex) {
+  static_assert(numbers_internal::kFastToBufferSize >= 32,
+                "This function only works when output buffer >= 32 bytes long");
   char* const end = &digits_[numbers_internal::kFastToBufferSize];
-  char* writer = end;
-  uint64_t value = hex.value;
-  do {
-    *--writer = absl::numbers_internal::kHexChar[value & 0xF];
-    value >>= 4;
-  } while (value != 0);
-
-  char* beg;
-  if (end - writer < hex.width) {
-    beg = end - hex.width;
-    std::fill_n(beg, writer - beg, hex.fill);
+  auto real_width =
+      absl::numbers_internal::FastHexToBufferZeroPad16(hex.value, end - 16);
+  if (real_width >= hex.width) {
+    piece_ = absl::string_view(end - real_width, real_width);
   } else {
-    beg = writer;
+    // Pad first 16 chars because FastHexToBufferZeroPad16 pads only to 16 and
+    // max pad width can be up to 20.
+    std::memset(end - 32, hex.fill, 16);
+    // Patch up everything else up to the real_width.
+    std::memset(end - real_width - 16, hex.fill, 16);
+    piece_ = absl::string_view(end - hex.width, hex.width);
   }
-
-  piece_ = absl::string_view(beg, end - beg);
 }
 
 AlphaNum::AlphaNum(Dec dec) {
diff --git a/absl/strings/str_format.h b/absl/strings/str_format.h
index 607e2bcaae16..c11c93a24837 100644
--- a/absl/strings/str_format.h
+++ b/absl/strings/str_format.h
@@ -400,6 +400,12 @@ int FPrintF(std::FILE* output, const FormatSpec<Args...>& format,
 // This function is functionally equivalent to `std::snprintf()` (and
 // type-safe); prefer `absl::SNPrintF()` over `std::snprintf()`.
 //
+// In particular, a successful call to `absl::SNPrintF()` writes at most `size`
+// bytes of the formatted output to `output`, including a null terminator, and
+// returns the number of bytes that would have been written if truncation did
+// not occur. In the event of an error, a negative value is returned and `errno`
+// is set.
+//
 // Example:
 //
 //   std::string_view s = "Ulaanbaatar";
diff --git a/absl/strings/string_view.cc b/absl/strings/string_view.cc
index dc034a83eea8..d5e1a3de9ff3 100644
--- a/absl/strings/string_view.cc
+++ b/absl/strings/string_view.cc
@@ -14,7 +14,7 @@
 
 #include "absl/strings/string_view.h"
 
-#ifndef ABSL_HAVE_STD_STRING_VIEW
+#ifndef ABSL_USES_STD_STRING_VIEW
 
 #include <algorithm>
 #include <climits>
@@ -230,4 +230,4 @@ constexpr string_view::size_type string_view::kMaxSize;
 
 }  // namespace absl
 
-#endif  // ABSL_HAVE_STD_STRING_VIEW
+#endif  // ABSL_USES_STD_STRING_VIEW
diff --git a/absl/strings/string_view.h b/absl/strings/string_view.h
index 3438ccc12a7d..07075e80ec64 100644
--- a/absl/strings/string_view.h
+++ b/absl/strings/string_view.h
@@ -30,7 +30,7 @@
 #include <algorithm>
 #include "absl/base/config.h"
 
-#ifdef ABSL_HAVE_STD_STRING_VIEW
+#ifdef ABSL_USES_STD_STRING_VIEW
 
 #include <string_view>  // IWYU pragma: export
 
@@ -38,7 +38,7 @@ namespace absl {
 using std::string_view;
 }  // namespace absl
 
-#else  // ABSL_HAVE_STD_STRING_VIEW
+#else  // ABSL_USES_STD_STRING_VIEW
 
 #if ABSL_HAVE_BUILTIN(__builtin_memcmp) || \
     (defined(__GNUC__) && !defined(__clang__))
@@ -580,7 +580,7 @@ std::ostream& operator<<(std::ostream& o, string_view piece);
 
 #undef ABSL_INTERNAL_STRING_VIEW_MEMCMP
 
-#endif  // ABSL_HAVE_STD_STRING_VIEW
+#endif  // ABSL_USES_STD_STRING_VIEW
 
 namespace absl {
 
diff --git a/absl/strings/string_view_test.cc b/absl/strings/string_view_test.cc
index 86f2fbcd003a..96dacdf048cf 100644
--- a/absl/strings/string_view_test.cc
+++ b/absl/strings/string_view_test.cc
@@ -830,7 +830,7 @@ TEST(StringViewTest, FrontBackSingleChar) {
 // to the standard, but `absl::string_view` implements a different
 // behavior for historical reasons. We work around tests that construct
 // `string_view` from `nullptr` when using libc++.
-#if !defined(ABSL_HAVE_STD_STRING_VIEW) ||                    \
+#if !defined(ABSL_USES_STD_STRING_VIEW) ||                    \
     (!(defined(_GLIBCXX_RELEASE) && _GLIBCXX_RELEASE >= 9) && \
      !defined(_LIBCPP_VERSION) && !defined(_MSC_VER))
 #define ABSL_HAVE_STRING_VIEW_FROM_NULLPTR 1
@@ -938,7 +938,7 @@ TEST(StringViewTest, ConstexprCompiles) {
 #endif
   constexpr absl::string_view cstr_len("cstr", 4);
 
-#if defined(ABSL_HAVE_STD_STRING_VIEW)
+#if defined(ABSL_USES_STD_STRING_VIEW)
   // In libstdc++ (as of 7.2), `std::string_view::string_view(const char*)`
   // calls `std::char_traits<char>::length(const char*)` to get the std::string
   // length, but it is not marked constexpr yet. See GCC bug:
@@ -952,7 +952,7 @@ TEST(StringViewTest, ConstexprCompiles) {
 #define ABSL_HAVE_CONSTEXPR_STRING_VIEW_FROM_CSTR 1
 #endif  // !__GLIBCXX__
 
-#else  // ABSL_HAVE_STD_STRING_VIEW
+#else  // ABSL_USES_STD_STRING_VIEW
 
 // This duplicates the check for __builtin_strlen in the header.
 #if ABSL_HAVE_BUILTIN(__builtin_strlen) || \
@@ -967,7 +967,7 @@ TEST(StringViewTest, ConstexprCompiles) {
 #define ABSL_HAVE_CONSTEXPR_STRING_VIEW_FROM_CSTR 1
 #endif
 
-#endif  // ABSL_HAVE_STD_STRING_VIEW
+#endif  // ABSL_USES_STD_STRING_VIEW
 
 #ifdef ABSL_HAVE_CONSTEXPR_STRING_VIEW_FROM_CSTR
   constexpr absl::string_view cstr_strlen("foo");
@@ -1136,7 +1136,7 @@ TEST(HugeStringView, TwoPointTwoGB) {
 }
 #endif  // THREAD_SANITIZER
 
-#if !defined(NDEBUG) && !defined(ABSL_HAVE_STD_STRING_VIEW)
+#if !defined(NDEBUG) && !defined(ABSL_USES_STD_STRING_VIEW)
 TEST(NonNegativeLenTest, NonNegativeLen) {
   ABSL_EXPECT_DEATH_IF_SUPPORTED(absl::string_view("xyz", -1),
                                  "len <= kMaxSize");
@@ -1152,7 +1152,7 @@ TEST(LenExceedsMaxSizeTest, LenExceedsMaxSize) {
   ABSL_EXPECT_DEATH_IF_SUPPORTED(absl::string_view("", max_size + 1),
                                  "len <= kMaxSize");
 }
-#endif  // !defined(NDEBUG) && !defined(ABSL_HAVE_STD_STRING_VIEW)
+#endif  // !defined(NDEBUG) && !defined(ABSL_USES_STD_STRING_VIEW)
 
 class StringViewStreamTest : public ::testing::Test {
  public:
diff --git a/absl/synchronization/internal/waiter.cc b/absl/synchronization/internal/waiter.cc
index d83d8087f8d5..2f41aa5f2b44 100644
--- a/absl/synchronization/internal/waiter.cc
+++ b/absl/synchronization/internal/waiter.cc
@@ -161,7 +161,7 @@ bool Waiter::Wait(KernelTimeout t) {
 
 void Waiter::Post() {
   if (futex_.fetch_add(1, std::memory_order_release) == 0) {
-    // We incremented from 0, need to wake a potential waker.
+    // We incremented from 0, need to wake a potential waiter.
     Poke();
   }
 }
@@ -210,8 +210,8 @@ void Waiter::Init() {
     ABSL_RAW_LOG(FATAL, "pthread_cond_init failed: %d", err2);
   }
 
-  waiter_count_.store(0, std::memory_order_relaxed);
-  wakeup_count_.store(0, std::memory_order_relaxed);
+  waiter_count_ = 0;
+  wakeup_count_ = 0;
 }
 
 bool Waiter::Wait(KernelTimeout t) {
@@ -221,24 +221,12 @@ bool Waiter::Wait(KernelTimeout t) {
   }
 
   PthreadMutexHolder h(&mu_);
-  waiter_count_.fetch_add(1, std::memory_order_relaxed);
+  ++waiter_count_;
   // Loop until we find a wakeup to consume or timeout.
   // Note that, since the thread ticker is just reset, we don't need to check
   // whether the thread is idle on the very first pass of the loop.
   bool first_pass = true;
-  while (true) {
-    int x = wakeup_count_.load(std::memory_order_relaxed);
-    if (x != 0) {
-      if (!wakeup_count_.compare_exchange_weak(x, x - 1,
-                                               std::memory_order_acquire,
-                                               std::memory_order_relaxed)) {
-        continue;  // Raced with someone, retry.
-      }
-      // Successfully consumed a wakeup, we're done.
-      waiter_count_.fetch_sub(1, std::memory_order_relaxed);
-      return true;
-    }
-
+  while (wakeup_count_ == 0) {
     if (!first_pass) MaybeBecomeIdle();
     // No wakeups available, time to wait.
     if (!t.has_timeout()) {
@@ -249,34 +237,38 @@ bool Waiter::Wait(KernelTimeout t) {
     } else {
       const int err = pthread_cond_timedwait(&cv_, &mu_, &abs_timeout);
       if (err == ETIMEDOUT) {
-        waiter_count_.fetch_sub(1, std::memory_order_relaxed);
+        --waiter_count_;
         return false;
       }
       if (err != 0) {
-        ABSL_RAW_LOG(FATAL, "pthread_cond_wait failed: %d", err);
+        ABSL_RAW_LOG(FATAL, "pthread_cond_timedwait failed: %d", err);
       }
     }
     first_pass = false;
   }
+  // Consume a wakeup and we're done.
+  --wakeup_count_;
+  --waiter_count_;
+  return true;
 }
 
 void Waiter::Post() {
-  wakeup_count_.fetch_add(1, std::memory_order_release);
-  Poke();
+  PthreadMutexHolder h(&mu_);
+  ++wakeup_count_;
+  InternalCondVarPoke();
 }
 
 void Waiter::Poke() {
-  if (waiter_count_.load(std::memory_order_relaxed) == 0) {
-    return;
-  }
-  // Potentially a waker. Take the lock and check again.
   PthreadMutexHolder h(&mu_);
-  if (waiter_count_.load(std::memory_order_relaxed) == 0) {
-    return;
-  }
-  const int err = pthread_cond_signal(&cv_);
-  if (err != 0) {
-    ABSL_RAW_LOG(FATAL, "pthread_cond_signal failed: %d", err);
+  InternalCondVarPoke();
+}
+
+void Waiter::InternalCondVarPoke() {
+  if (waiter_count_ != 0) {
+    const int err = pthread_cond_signal(&cv_);
+    if (ABSL_PREDICT_FALSE(err != 0)) {
+      ABSL_RAW_LOG(FATAL, "pthread_cond_signal failed: %d", err);
+    }
   }
 }
 
@@ -456,7 +448,7 @@ void Waiter::Poke() {
   if (waiter_count_.load(std::memory_order_relaxed) == 0) {
     return;
   }
-  // Potentially a waker. Take the lock and check again.
+  // Potentially a waiter. Take the lock and check again.
   LockHolder h(WinHelper::GetLock(this));
   if (waiter_count_.load(std::memory_order_relaxed) == 0) {
     return;
diff --git a/absl/synchronization/internal/waiter.h b/absl/synchronization/internal/waiter.h
index 099935453bee..c23897007e70 100644
--- a/absl/synchronization/internal/waiter.h
+++ b/absl/synchronization/internal/waiter.h
@@ -106,10 +106,13 @@ class Waiter {
   static_assert(sizeof(int32_t) == sizeof(futex_), "Wrong size for futex");
 
 #elif ABSL_WAITER_MODE == ABSL_WAITER_MODE_CONDVAR
+  // REQUIRES: mu_ must be held.
+  void InternalCondVarPoke();
+
   pthread_mutex_t mu_;
   pthread_cond_t cv_;
-  std::atomic<int> waiter_count_;
-  std::atomic<int> wakeup_count_;  // Unclaimed wakeups, written under lock.
+  int waiter_count_;
+  int wakeup_count_;  // Unclaimed wakeups.
 
 #elif ABSL_WAITER_MODE == ABSL_WAITER_MODE_SEM
   sem_t sem_;
diff --git a/absl/synchronization/lifetime_test.cc b/absl/synchronization/lifetime_test.cc
index 34b8875b4b70..cc973a329071 100644
--- a/absl/synchronization/lifetime_test.cc
+++ b/absl/synchronization/lifetime_test.cc
@@ -122,6 +122,11 @@ class OnDestruction {
   Function fn_;
 };
 
+// These tests require that the compiler correctly supports C++11 constant
+// initialization... but MSVC has a known regression since v19.10:
+// https://developercommunity.visualstudio.com/content/problem/336946/class-with-constexpr-constructor-not-using-static.html
+// TODO(epastor): Limit the affected range once MSVC fixes this bug.
+#if defined(__clang__) || !(defined(_MSC_VER) && _MSC_VER > 1900)
 // kConstInit
 // Test early usage.  (Declaration comes first; definitions must appear after
 // the test runner.)
@@ -151,6 +156,7 @@ OnConstruction check_still_locked([]() ABSL_NO_THREAD_SAFETY_ANALYSIS {
   const_init_sanity_mutex.AssertHeld();
   const_init_sanity_mutex.Unlock();
 });
+#endif  // defined(__clang__) || !(defined(_MSC_VER) && _MSC_VER > 1900)
 
 // Test shutdown usage.  (Declarations come first; definitions must appear after
 // the test runner.)
diff --git a/absl/time/civil_time.h b/absl/time/civil_time.h
index c8166d07c94e..77c3be2eba6b 100644
--- a/absl/time/civil_time.h
+++ b/absl/time/civil_time.h
@@ -519,7 +519,7 @@ namespace time_internal {  // For functions found via ADL on civil-time tags.
 //
 // Example:
 //
-//   absl::CivilDay d = absl::CivilDay("1969-07-20");
+//   absl::CivilDay d = absl::CivilDay(1969, 7, 20);
 //   std::cout << "Date is: " << d << "\n";
 //
 std::ostream& operator<<(std::ostream& os, CivilYear y);
diff --git a/absl/time/duration.cc b/absl/time/duration.cc
index 9a8768113f31..f0b4631d6fa9 100644
--- a/absl/time/duration.cc
+++ b/absl/time/duration.cc
@@ -197,11 +197,11 @@ inline int64_t DecodeTwosComp(uint64_t v) { return absl::bit_cast<int64_t>(v); }
 // double as overflow cases.
 inline bool SafeAddRepHi(double a_hi, double b_hi, Duration* d) {
   double c = a_hi + b_hi;
-  if (c >= kint64max) {
+  if (c >= static_cast<double>(kint64max)) {
     *d = InfiniteDuration();
     return false;
   }
-  if (c <= kint64min) {
+  if (c <= static_cast<double>(kint64min)) {
     *d = -InfiniteDuration();
     return false;
   }
diff --git a/absl/time/time.h b/absl/time/time.h
index 0b7312ee983d..46ac26b3c0d2 100644
--- a/absl/time/time.h
+++ b/absl/time/time.h
@@ -422,7 +422,9 @@ Duration Milliseconds(T n) {
 template <typename T, time_internal::EnableIfFloat<T> = 0>
 Duration Seconds(T n) {
   if (n >= 0) {  // Note: `NaN >= 0` is false.
-    if (n >= (std::numeric_limits<int64_t>::max)()) return InfiniteDuration();
+    if (n >= static_cast<T>((std::numeric_limits<int64_t>::max)())) {
+      return InfiniteDuration();
+    }
     return time_internal::MakePosDoubleDuration(n);
   } else {
     if (std::isnan(n))
diff --git a/absl/types/any.h b/absl/types/any.h
index 507c8b2cc4f1..f79676949d3d 100644
--- a/absl/types/any.h
+++ b/absl/types/any.h
@@ -56,7 +56,7 @@
 #include "absl/base/config.h"
 #include "absl/utility/utility.h"
 
-#ifdef ABSL_HAVE_STD_ANY
+#ifdef ABSL_USES_STD_ANY
 
 #include <any>  // IWYU pragma: export
 
@@ -67,7 +67,7 @@ using std::bad_any_cast;
 using std::make_any;
 }  // namespace absl
 
-#else  // ABSL_HAVE_STD_ANY
+#else  // ABSL_USES_STD_ANY
 
 #include <algorithm>
 #include <cstddef>
@@ -538,6 +538,6 @@ T* any_cast(any* operand) noexcept {
 
 #undef ABSL_ANY_DETAIL_HAS_RTTI
 
-#endif  // ABSL_HAVE_STD_ANY
+#endif  // ABSL_USES_STD_ANY
 
 #endif  // ABSL_TYPES_ANY_H_
diff --git a/absl/types/any_exception_safety_test.cc b/absl/types/any_exception_safety_test.cc
index 17d7f5d77813..31c1140135f0 100644
--- a/absl/types/any_exception_safety_test.cc
+++ b/absl/types/any_exception_safety_test.cc
@@ -18,7 +18,7 @@
 
 // This test is a no-op when absl::any is an alias for std::any and when
 // exceptions are not enabled.
-#if !defined(ABSL_HAVE_STD_ANY) && defined(ABSL_HAVE_EXCEPTIONS)
+#if !defined(ABSL_USES_STD_ANY) && defined(ABSL_HAVE_EXCEPTIONS)
 
 #include <typeinfo>
 #include <vector>
@@ -170,4 +170,4 @@ TEST(AnyExceptionSafety, Emplace) {
 
 }  // namespace
 
-#endif  // #if !defined(ABSL_HAVE_STD_ANY) && defined(ABSL_HAVE_EXCEPTIONS)
+#endif  // #if !defined(ABSL_USES_STD_ANY) && defined(ABSL_HAVE_EXCEPTIONS)
diff --git a/absl/types/any_test.cc b/absl/types/any_test.cc
index 4a848ae4ae8f..70e4ba22b12b 100644
--- a/absl/types/any_test.cc
+++ b/absl/types/any_test.cc
@@ -15,7 +15,7 @@
 #include "absl/types/any.h"
 
 // This test is a no-op when absl::any is an alias for std::any.
-#if !defined(ABSL_HAVE_STD_ANY)
+#if !defined(ABSL_USES_STD_ANY)
 
 #include <initializer_list>
 #include <type_traits>
@@ -642,7 +642,7 @@ TEST(AnyTest, ConversionConstructionCausesOneCopy) {
 // Tests for Exception Behavior //
 //////////////////////////////////
 
-#if defined(ABSL_HAVE_STD_ANY)
+#if defined(ABSL_USES_STD_ANY)
 
 // If using a std `any` implementation, we can't check for a specific message.
 #define ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(...)                      \
@@ -656,7 +656,7 @@ TEST(AnyTest, ConversionConstructionCausesOneCopy) {
   ABSL_BASE_INTERNAL_EXPECT_FAIL((__VA_ARGS__), absl::bad_any_cast, \
                                  "Bad any cast")
 
-#endif  // defined(ABSL_HAVE_STD_ANY)
+#endif  // defined(ABSL_USES_STD_ANY)
 
 TEST(AnyTest, ThrowBadAlloc) {
   {
@@ -764,7 +764,7 @@ TEST(AnyTest, FailedEmplace) {
     BadCopyable bad;
     absl::any target(absl::in_place_type<int>);
     ABSL_ANY_TEST_EXPECT_BAD_COPY(target.emplace<BadCopyable>(bad));
-#if defined(ABSL_HAVE_STD_ANY) && defined(__GLIBCXX__)
+#if defined(ABSL_USES_STD_ANY) && defined(__GLIBCXX__)
     // libstdc++ std::any::emplace() implementation (as of 7.2) has a bug: if an
     // exception is thrown, *this contains a value.
 #define ABSL_GLIBCXX_ANY_EMPLACE_EXCEPTION_BUG 1
@@ -778,4 +778,4 @@ TEST(AnyTest, FailedEmplace) {
 
 }  // namespace
 
-#endif  // #if !defined(ABSL_HAVE_STD_ANY)
+#endif  // #if !defined(ABSL_USES_STD_ANY)
diff --git a/absl/types/bad_any_cast.cc b/absl/types/bad_any_cast.cc
index 505919a55831..2a5381266452 100644
--- a/absl/types/bad_any_cast.cc
+++ b/absl/types/bad_any_cast.cc
@@ -14,7 +14,7 @@
 
 #include "absl/types/bad_any_cast.h"
 
-#ifndef ABSL_HAVE_STD_ANY
+#ifndef ABSL_USES_STD_ANY
 
 #include <cstdlib>
 
@@ -41,4 +41,4 @@ void ThrowBadAnyCast() {
 }  // namespace any_internal
 }  // namespace absl
 
-#endif  // ABSL_HAVE_STD_ANY
+#endif  // ABSL_USES_STD_ANY
diff --git a/absl/types/bad_any_cast.h b/absl/types/bad_any_cast.h
index 8d020ede466b..6a53c0108100 100644
--- a/absl/types/bad_any_cast.h
+++ b/absl/types/bad_any_cast.h
@@ -25,7 +25,7 @@
 
 #include "absl/base/config.h"
 
-#ifdef ABSL_HAVE_STD_ANY
+#ifdef ABSL_USES_STD_ANY
 
 #include <any>
 
@@ -33,7 +33,7 @@ namespace absl {
 using std::bad_any_cast;
 }  // namespace absl
 
-#else  // ABSL_HAVE_STD_ANY
+#else  // ABSL_USES_STD_ANY
 
 namespace absl {
 
@@ -66,6 +66,6 @@ namespace any_internal {
 }  // namespace any_internal
 }  // namespace absl
 
-#endif  // ABSL_HAVE_STD_ANY
+#endif  // ABSL_USES_STD_ANY
 
 #endif  // ABSL_TYPES_BAD_ANY_CAST_H_
diff --git a/absl/types/bad_optional_access.cc b/absl/types/bad_optional_access.cc
index a791c7c21da8..d9ec21bf42b9 100644
--- a/absl/types/bad_optional_access.cc
+++ b/absl/types/bad_optional_access.cc
@@ -14,7 +14,7 @@
 
 #include "absl/types/bad_optional_access.h"
 
-#ifndef ABSL_HAVE_STD_OPTIONAL
+#ifndef ABSL_USES_STD_OPTIONAL
 
 #include <cstdlib>
 
@@ -43,4 +43,4 @@ void throw_bad_optional_access() {
 }  // namespace optional_internal
 }  // namespace absl
 
-#endif  // ABSL_HAVE_STD_OPTIONAL
+#endif  // ABSL_USES_STD_OPTIONAL
diff --git a/absl/types/bad_optional_access.h b/absl/types/bad_optional_access.h
index add5c452cd50..32dd6a91ea65 100644
--- a/absl/types/bad_optional_access.h
+++ b/absl/types/bad_optional_access.h
@@ -25,7 +25,7 @@
 
 #include "absl/base/config.h"
 
-#ifdef ABSL_HAVE_STD_OPTIONAL
+#ifdef ABSL_USES_STD_OPTIONAL
 
 #include <optional>
 
@@ -33,7 +33,7 @@ namespace absl {
 using std::bad_optional_access;
 }  // namespace absl
 
-#else  // ABSL_HAVE_STD_OPTIONAL
+#else  // ABSL_USES_STD_OPTIONAL
 
 namespace absl {
 
@@ -69,6 +69,6 @@ namespace optional_internal {
 }  // namespace optional_internal
 }  // namespace absl
 
-#endif  // ABSL_HAVE_STD_OPTIONAL
+#endif  // ABSL_USES_STD_OPTIONAL
 
 #endif  // ABSL_TYPES_BAD_OPTIONAL_ACCESS_H_
diff --git a/absl/types/bad_variant_access.cc b/absl/types/bad_variant_access.cc
index a4325c8df7db..dbaea9e9d1db 100644
--- a/absl/types/bad_variant_access.cc
+++ b/absl/types/bad_variant_access.cc
@@ -14,7 +14,7 @@
 
 #include "absl/types/bad_variant_access.h"
 
-#ifndef ABSL_HAVE_STD_VARIANT
+#ifndef ABSL_USES_STD_VARIANT
 
 #include <cstdlib>
 #include <stdexcept>
@@ -59,4 +59,4 @@ void Rethrow() {
 }  // namespace variant_internal
 }  // namespace absl
 
-#endif  // ABSL_HAVE_STD_VARIANT
+#endif  // ABSL_USES_STD_VARIANT
diff --git a/absl/types/bad_variant_access.h b/absl/types/bad_variant_access.h
index 637db4355053..6935d01b99f7 100644
--- a/absl/types/bad_variant_access.h
+++ b/absl/types/bad_variant_access.h
@@ -25,7 +25,7 @@
 
 #include "absl/base/config.h"
 
-#ifdef ABSL_HAVE_STD_VARIANT
+#ifdef ABSL_USES_STD_VARIANT
 
 #include <variant>
 
@@ -33,7 +33,7 @@ namespace absl {
 using std::bad_variant_access;
 }  // namespace absl
 
-#else  // ABSL_HAVE_STD_VARIANT
+#else  // ABSL_USES_STD_VARIANT
 
 namespace absl {
 
@@ -73,6 +73,6 @@ namespace variant_internal {
 }  // namespace variant_internal
 }  // namespace absl
 
-#endif  // ABSL_HAVE_STD_VARIANT
+#endif  // ABSL_USES_STD_VARIANT
 
 #endif  // ABSL_TYPES_BAD_VARIANT_ACCESS_H_
diff --git a/absl/types/internal/variant.h b/absl/types/internal/variant.h
index 19de2e137593..58b385921f59 100644
--- a/absl/types/internal/variant.h
+++ b/absl/types/internal/variant.h
@@ -37,7 +37,7 @@
 #include "absl/types/bad_variant_access.h"
 #include "absl/utility/utility.h"
 
-#if !defined(ABSL_HAVE_STD_VARIANT)
+#if !defined(ABSL_USES_STD_VARIANT)
 
 namespace absl {
 
@@ -1640,5 +1640,5 @@ struct VariantHashBase<Variant,
 }  // namespace variant_internal
 }  // namespace absl
 
-#endif  // !defined(ABSL_HAVE_STD_VARIANT)
+#endif  // !defined(ABSL_USES_STD_VARIANT)
 #endif  // ABSL_TYPES_variant_internal_H_
diff --git a/absl/types/optional.h b/absl/types/optional.h
index ed8faf97a1d4..14032598d9b0 100644
--- a/absl/types/optional.h
+++ b/absl/types/optional.h
@@ -38,7 +38,7 @@
 #include "absl/base/config.h"   // TODO(calabrese) IWYU removal?
 #include "absl/utility/utility.h"
 
-#ifdef ABSL_HAVE_STD_OPTIONAL
+#ifdef ABSL_USES_STD_OPTIONAL
 
 #include <optional>  // IWYU pragma: export
 
@@ -50,7 +50,7 @@ using std::nullopt_t;
 using std::nullopt;
 }  // namespace absl
 
-#else  // ABSL_HAVE_STD_OPTIONAL
+#else  // ABSL_USES_STD_OPTIONAL
 
 #include <cassert>
 #include <functional>
@@ -767,6 +767,6 @@ struct hash<absl::optional<T> >
 
 #undef ABSL_MSVC_CONSTEXPR_BUG_IN_UNION_LIKE_CLASS
 
-#endif  // ABSL_HAVE_STD_OPTIONAL
+#endif  // ABSL_USES_STD_OPTIONAL
 
 #endif  // ABSL_TYPES_OPTIONAL_H_
diff --git a/absl/types/optional_exception_safety_test.cc b/absl/types/optional_exception_safety_test.cc
index f99e35c05447..0f7fae6cb4cf 100644
--- a/absl/types/optional_exception_safety_test.cc
+++ b/absl/types/optional_exception_safety_test.cc
@@ -18,7 +18,7 @@
 
 // This test is a no-op when absl::optional is an alias for std::optional and
 // when exceptions are not enabled.
-#if !defined(ABSL_HAVE_STD_OPTIONAL) && defined(ABSL_HAVE_EXCEPTIONS)
+#if !defined(ABSL_USES_STD_OPTIONAL) && defined(ABSL_HAVE_EXCEPTIONS)
 
 #include "gtest/gtest.h"
 #include "absl/base/internal/exception_safety_testing.h"
@@ -287,4 +287,4 @@ TEST(OptionalExceptionSafety, NothrowMoveAssign) {
 
 }  // namespace absl
 
-#endif  // #if !defined(ABSL_HAVE_STD_OPTIONAL) && defined(ABSL_HAVE_EXCEPTIONS)
+#endif  // #if !defined(ABSL_USES_STD_OPTIONAL) && defined(ABSL_HAVE_EXCEPTIONS)
diff --git a/absl/types/optional_test.cc b/absl/types/optional_test.cc
index 35efa8635077..47d5c8a29e00 100644
--- a/absl/types/optional_test.cc
+++ b/absl/types/optional_test.cc
@@ -15,7 +15,7 @@
 #include "absl/types/optional.h"
 
 // This test is a no-op when absl::optional is an alias for std::optional.
-#if !defined(ABSL_HAVE_STD_OPTIONAL)
+#if !defined(ABSL_USES_STD_OPTIONAL)
 
 #include <string>
 #include <type_traits>
@@ -224,7 +224,7 @@ TEST(optionalTest, CopyConstructor) {
 
   EXPECT_FALSE(
       absl::is_trivially_copy_constructible<absl::optional<Copyable>>::value);
-#if defined(ABSL_HAVE_STD_OPTIONAL) && defined(__GLIBCXX__)
+#if defined(ABSL_USES_STD_OPTIONAL) && defined(__GLIBCXX__)
   // libstdc++ std::optional implementation (as of 7.2) has a bug: when T is
   // trivially copyable, optional<T> is not trivially copyable (due to one of
   // its base class is unconditionally nontrivial).
@@ -279,7 +279,7 @@ TEST(optionalTest, CopyConstructor) {
     // std::optional when T is volatile-qualified. So skipping this test.
     // Bug report:
     // https://connect.microsoft.com/VisualStudio/feedback/details/3142534
-#if defined(ABSL_HAVE_STD_OPTIONAL) && defined(_MSC_VER) && _MSC_VER >= 1911
+#if defined(ABSL_USES_STD_OPTIONAL) && defined(_MSC_VER) && _MSC_VER >= 1911
 #define ABSL_MSVC_OPTIONAL_VOLATILE_COPY_BUG 1
 #endif
 #ifndef ABSL_MSVC_OPTIONAL_VOLATILE_COPY_BUG
@@ -305,7 +305,7 @@ TEST(optionalTest, MoveConstructor) {
   EXPECT_FALSE(std::is_move_constructible<absl::optional<NonMovable>>::value);
   // test noexcept
   EXPECT_TRUE(std::is_nothrow_move_constructible<absl::optional<int>>::value);
-#ifndef ABSL_HAVE_STD_OPTIONAL
+#ifndef ABSL_USES_STD_OPTIONAL
   EXPECT_EQ(
       absl::default_allocator_is_nothrow::value,
       std::is_nothrow_move_constructible<absl::optional<MoveableThrow>>::value);
@@ -639,7 +639,7 @@ TEST(optionalTest, CopyAssignment) {
   EXPECT_FALSE(absl::is_trivially_copy_assignable<NonTrivial>::value);
 
   // std::optional doesn't support volatile nontrivial types.
-#ifndef ABSL_HAVE_STD_OPTIONAL
+#ifndef ABSL_USES_STD_OPTIONAL
   {
     StructorListener listener;
     Listenable::listener = &listener;
@@ -658,7 +658,7 @@ TEST(optionalTest, CopyAssignment) {
     EXPECT_EQ(1, listener.destruct);
     EXPECT_EQ(1, listener.volatile_copy_assign);
   }
-#endif  // ABSL_HAVE_STD_OPTIONAL
+#endif  // ABSL_USES_STD_OPTIONAL
 }
 
 TEST(optionalTest, MoveAssignment) {
@@ -682,7 +682,7 @@ TEST(optionalTest, MoveAssignment) {
     EXPECT_EQ(1, listener.move_assign);
   }
   // std::optional doesn't support volatile nontrivial types.
-#ifndef ABSL_HAVE_STD_OPTIONAL
+#ifndef ABSL_USES_STD_OPTIONAL
   {
     StructorListener listener;
     Listenable::listener = &listener;
@@ -702,7 +702,7 @@ TEST(optionalTest, MoveAssignment) {
     EXPECT_EQ(1, listener.destruct);
     EXPECT_EQ(1, listener.volatile_move_assign);
   }
-#endif  // ABSL_HAVE_STD_OPTIONAL
+#endif  // ABSL_USES_STD_OPTIONAL
   EXPECT_FALSE(absl::is_move_assignable<absl::optional<const int>>::value);
   EXPECT_TRUE(absl::is_move_assignable<absl::optional<Copyable>>::value);
   EXPECT_TRUE(absl::is_move_assignable<absl::optional<MoveableThrow>>::value);
@@ -1560,7 +1560,7 @@ TEST(optionalTest, NoExcept) {
   static_assert(
       std::is_nothrow_move_constructible<absl::optional<MoveMeNoThrow>>::value,
       "");
-#ifndef ABSL_HAVE_STD_OPTIONAL
+#ifndef ABSL_USES_STD_OPTIONAL
   static_assert(absl::default_allocator_is_nothrow::value ==
                     std::is_nothrow_move_constructible<
                         absl::optional<MoveMeThrow>>::value,
@@ -1658,4 +1658,4 @@ TEST(optionalTest, InPlaceTSFINAEBug) {
 
 }  // namespace
 
-#endif  // #if !defined(ABSL_HAVE_STD_OPTIONAL)
+#endif  // #if !defined(ABSL_USES_STD_OPTIONAL)
diff --git a/absl/types/variant.h b/absl/types/variant.h
index 7ef7f88ca110..f3558703a82a 100644
--- a/absl/types/variant.h
+++ b/absl/types/variant.h
@@ -45,7 +45,7 @@
 #include "absl/base/config.h"
 #include "absl/utility/utility.h"
 
-#ifdef ABSL_HAVE_STD_VARIANT
+#ifdef ABSL_USES_STD_VARIANT
 
 #include <variant>  // IWYU pragma: export
 
@@ -64,7 +64,7 @@ using std::variant_size_v;
 using std::visit;
 }  // namespace absl
 
-#else  // ABSL_HAVE_STD_VARIANT
+#else  // ABSL_USES_STD_VARIANT
 
 #include <functional>
 #include <new>
@@ -812,7 +812,7 @@ struct hash<absl::variant<T...>>
 
 }  // namespace std
 
-#endif  // ABSL_HAVE_STD_VARIANT
+#endif  // ABSL_USES_STD_VARIANT
 
 namespace absl {
 namespace variant_internal {
diff --git a/absl/types/variant_exception_safety_test.cc b/absl/types/variant_exception_safety_test.cc
index fd7e6c7fe802..b486a71e5b72 100644
--- a/absl/types/variant_exception_safety_test.cc
+++ b/absl/types/variant_exception_safety_test.cc
@@ -18,7 +18,7 @@
 
 // This test is a no-op when absl::variant is an alias for std::variant and when
 // exceptions are not enabled.
-#if !defined(ABSL_HAVE_STD_VARIANT) && defined(ABSL_HAVE_EXCEPTIONS)
+#if !defined(ABSL_USES_STD_VARIANT) && defined(ABSL_HAVE_EXCEPTIONS)
 
 #include <iostream>
 #include <memory>
@@ -237,7 +237,7 @@ TEST(VariantExceptionSafetyTest, CopyAssign) {
   }
   // libstdc++ std::variant has bugs on copy assignment regarding exception
   // safety.
-#if !(defined(ABSL_HAVE_STD_VARIANT) && defined(__GLIBCXX__))
+#if !(defined(ABSL_USES_STD_VARIANT) && defined(__GLIBCXX__))
   // index() != j
   // if is_nothrow_copy_constructible_v<Tj> or
   // !is_nothrow_move_constructible<Tj> is true, equivalent to
@@ -268,7 +268,7 @@ TEST(VariantExceptionSafetyTest, CopyAssign) {
                     .Test());
     EXPECT_FALSE(tester.WithContracts(strong_guarantee).Test());
   }
-#endif  // !(defined(ABSL_HAVE_STD_VARIANT) && defined(__GLIBCXX__))
+#endif  // !(defined(ABSL_USES_STD_VARIANT) && defined(__GLIBCXX__))
   {
     // is_nothrow_copy_constructible_v<Tj> == false &&
     // is_nothrow_move_constructible_v<Tj> == true
@@ -325,7 +325,7 @@ TEST(VariantExceptionSafetyTest, MoveAssign) {
     // The fix is targeted for gcc-9.
     // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87431#c7
     // https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=267614
-#if !(defined(ABSL_HAVE_STD_VARIANT) && \
+#if !(defined(ABSL_USES_STD_VARIANT) && \
       defined(_GLIBCXX_RELEASE) && _GLIBCXX_RELEASE == 8)
     // - otherwise (index() != j), equivalent to
     // emplace<j>(get<j>(std::move(rhs)))
@@ -342,7 +342,7 @@ TEST(VariantExceptionSafetyTest, MoveAssign) {
                       auto copy = rhs;
                       *lhs = std::move(copy);
                     }));
-#endif  // !(defined(ABSL_HAVE_STD_VARIANT) &&
+#endif  // !(defined(ABSL_USES_STD_VARIANT) &&
         //   defined(_GLIBCXX_RELEASE) && _GLIBCXX_RELEASE == 8)
   }
 }
@@ -445,7 +445,7 @@ TEST(VariantExceptionSafetyTest, ValueAssign) {
   // and operator=(variant&&) invokes Tj's move ctor which doesn't throw.
   // libstdc++ std::variant has bugs on conversion assignment regarding
   // exception safety.
-#if !(defined(ABSL_HAVE_STD_VARIANT) && defined(__GLIBCXX__))
+#if !(defined(ABSL_USES_STD_VARIANT) && defined(__GLIBCXX__))
   {
     MoveNothrow rhs;
     EXPECT_TRUE(MakeExceptionSafetyTester()
@@ -453,7 +453,7 @@ TEST(VariantExceptionSafetyTest, ValueAssign) {
                     .WithContracts(VariantInvariants, strong_guarantee)
                     .Test([&rhs](ThrowingVariant* lhs) { *lhs = rhs; }));
   }
-#endif  // !(defined(ABSL_HAVE_STD_VARIANT) && defined(__GLIBCXX__))
+#endif  // !(defined(ABSL_USES_STD_VARIANT) && defined(__GLIBCXX__))
 }
 
 TEST(VariantExceptionSafetyTest, Emplace) {
@@ -527,4 +527,4 @@ TEST(VariantExceptionSafetyTest, Swap) {
 
 #endif  // !defined(ABSL_INTERNAL_MSVC_2017_DBG_MODE)
 
-#endif  // #if !defined(ABSL_HAVE_STD_VARIANT) && defined(ABSL_HAVE_EXCEPTIONS)
+#endif  // #if !defined(ABSL_USES_STD_VARIANT) && defined(ABSL_HAVE_EXCEPTIONS)
diff --git a/absl/types/variant_test.cc b/absl/types/variant_test.cc
index b59127457148..2913775a4e59 100644
--- a/absl/types/variant_test.cc
+++ b/absl/types/variant_test.cc
@@ -20,7 +20,7 @@
 #include "absl/types/variant.h"
 
 // This test is a no-op when absl::variant is an alias for std::variant.
-#if !defined(ABSL_HAVE_STD_VARIANT)
+#if !defined(ABSL_USES_STD_VARIANT)
 
 #include <algorithm>
 #include <cstddef>
@@ -842,7 +842,7 @@ TEST(VariantTest, TestBackupAssign) {
   }
 
   // libstdc++ doesn't pass this test
-#if !(defined(ABSL_HAVE_STD_VARIANT) && defined(__GLIBCXX__))
+#if !(defined(ABSL_USES_STD_VARIANT) && defined(__GLIBCXX__))
   EXPECT_EQ(3, counter[0]);
   EXPECT_EQ(2, counter[1]);
   EXPECT_EQ(2, counter[2]);
@@ -1933,7 +1933,7 @@ TEST(VariantTest, VisitReferenceWrapper) {
 }
 
 // libstdc++ std::variant doesn't support the INVOKE semantics.
-#if !(defined(ABSL_HAVE_STD_VARIANT) && defined(__GLIBCXX__))
+#if !(defined(ABSL_USES_STD_VARIANT) && defined(__GLIBCXX__))
 TEST(VariantTest, VisitMemberFunction) {
   absl::variant<std::unique_ptr<Class>> p(absl::make_unique<Class>());
   absl::variant<std::unique_ptr<const Class>> cp(
@@ -1957,7 +1957,7 @@ TEST(VariantTest, VisitDataMember) {
 
   EXPECT_EQ(42, absl::visit(&Class::member, cp));
 }
-#endif  // !(defined(ABSL_HAVE_STD_VARIANT) && defined(__GLIBCXX__))
+#endif  // !(defined(ABSL_USES_STD_VARIANT) && defined(__GLIBCXX__))
 
 /////////////////////////
 // [variant.monostate] //
@@ -2035,7 +2035,7 @@ TEST(VariantTest, NonmemberSwap) {
   std::swap(a, b);
   EXPECT_THAT(a, VariantWith<SpecialSwap>(v2));
   EXPECT_THAT(b, VariantWith<SpecialSwap>(v1));
-#ifndef ABSL_HAVE_STD_VARIANT
+#ifndef ABSL_USES_STD_VARIANT
   EXPECT_FALSE(absl::get<SpecialSwap>(a).special_swap);
 #endif
 
@@ -2083,7 +2083,7 @@ TEST(VariantTest, Hash) {
 
 // MSVC std::hash<std::variant> does not use the index, thus produce the same
 // result on the same value as different alternative.
-#if !(defined(_MSC_VER) && defined(ABSL_HAVE_STD_VARIANT))
+#if !(defined(_MSC_VER) && defined(ABSL_USES_STD_VARIANT))
   {
     // same value as different alternative
     variant<int, int> v0(in_place_index<0>, 42);
@@ -2091,7 +2091,7 @@ TEST(VariantTest, Hash) {
     std::hash<variant<int, int>> hash;
     EXPECT_NE(hash(v0), hash(v1));
   }
-#endif  // !(defined(_MSC_VER) && defined(ABSL_HAVE_STD_VARIANT))
+#endif  // !(defined(_MSC_VER) && defined(ABSL_USES_STD_VARIANT))
 
   {
     std::hash<variant<int>> hash;
@@ -2118,7 +2118,7 @@ TEST(VariantTest, Hash) {
 ////////////////////////////////////////
 
 // Test that a set requiring a basic type conversion works correctly
-#if !defined(ABSL_HAVE_STD_VARIANT)
+#if !defined(ABSL_USES_STD_VARIANT)
 TEST(VariantTest, TestConvertingSet) {
   typedef variant<double> Variant;
   Variant v(1.0);
@@ -2128,7 +2128,7 @@ TEST(VariantTest, TestConvertingSet) {
   ASSERT_TRUE(nullptr != absl::get_if<double>(&v));
   EXPECT_DOUBLE_EQ(2, absl::get<double>(v));
 }
-#endif  // ABSL_HAVE_STD_VARIANT
+#endif  // ABSL_USES_STD_VARIANT
 
 // Test that a vector of variants behaves reasonably.
 TEST(VariantTest, Container) {
@@ -2280,7 +2280,7 @@ struct Convertible2 {
 };
 
 TEST(VariantTest, TestRvalueConversion) {
-#if !defined(ABSL_HAVE_STD_VARIANT)
+#if !defined(ABSL_USES_STD_VARIANT)
   variant<double, std::string> var(
       ConvertVariantTo<variant<double, std::string>>(
           variant<std::string, int>(0)));
@@ -2313,7 +2313,7 @@ TEST(VariantTest, TestRvalueConversion) {
   variant2 = ConvertVariantTo<variant<int32_t, uint32_t>>(variant<uint32_t>(42));
   ASSERT_TRUE(absl::holds_alternative<uint32_t>(variant2));
   EXPECT_EQ(42, absl::get<uint32_t>(variant2));
-#endif  // !ABSL_HAVE_STD_VARIANT
+#endif  // !ABSL_USES_STD_VARIANT
 
   variant<Convertible1, Convertible2> variant3(
       ConvertVariantTo<variant<Convertible1, Convertible2>>(
@@ -2326,7 +2326,7 @@ TEST(VariantTest, TestRvalueConversion) {
 }
 
 TEST(VariantTest, TestLvalueConversion) {
-#if !defined(ABSL_HAVE_STD_VARIANT)
+#if !defined(ABSL_USES_STD_VARIANT)
   variant<std::string, int> source1 = 0;
   variant<double, std::string> destination(
       ConvertVariantTo<variant<double, std::string>>(source1));
@@ -2428,7 +2428,7 @@ TEST(VariantTest, DoesNotMoveFromLvalues) {
 }
 
 TEST(VariantTest, TestRvalueConversionViaConvertVariantTo) {
-#if !defined(ABSL_HAVE_STD_VARIANT)
+#if !defined(ABSL_USES_STD_VARIANT)
   variant<double, std::string> var(
       ConvertVariantTo<variant<double, std::string>>(
           variant<std::string, int>(3)));
@@ -2467,7 +2467,7 @@ TEST(VariantTest, TestRvalueConversionViaConvertVariantTo) {
 }
 
 TEST(VariantTest, TestLvalueConversionViaConvertVariantTo) {
-#if !defined(ABSL_HAVE_STD_VARIANT)
+#if !defined(ABSL_USES_STD_VARIANT)
   variant<std::string, int> source1 = 3;
   variant<double, std::string> destination(
       ConvertVariantTo<variant<double, std::string>>(source1));
@@ -2499,7 +2499,7 @@ TEST(VariantTest, TestLvalueConversionViaConvertVariantTo) {
   variant<uint32_t> source6(42);
   variant2 = ConvertVariantTo<variant<int32_t, uint32_t>>(source6);
   EXPECT_THAT(absl::get_if<uint32_t>(&variant2), Pointee(42));
-#endif  // !ABSL_HAVE_STD_VARIANT
+#endif  // !ABSL_USES_STD_VARIANT
 
   variant<Convertible2, Convertible1> source7((Convertible1()));
   variant<Convertible1, Convertible2> variant3(
@@ -2533,7 +2533,7 @@ TEST(VariantTest, TestMoveConversionViaConvertVariantTo) {
 // standard and we know that libstdc++ variant doesn't have this feature.
 // For more details see the paper:
 // http://open-std.org/JTC1/SC22/WG21/docs/papers/2017/p0602r0.html
-#if !(defined(ABSL_HAVE_STD_VARIANT) && defined(__GLIBCXX__))
+#if !(defined(ABSL_USES_STD_VARIANT) && defined(__GLIBCXX__))
 #define ABSL_VARIANT_PROPAGATE_COPY_MOVE_TRIVIALITY 1
 #endif
 
@@ -2711,4 +2711,4 @@ TEST(VariantTest, MoveCtorBug) {
 }  // namespace
 }  // namespace absl
 
-#endif  // #if !defined(ABSL_HAVE_STD_VARIANT)
+#endif  // #if !defined(ABSL_USES_STD_VARIANT)
diff --git a/absl/utility/utility.h b/absl/utility/utility.h
index eef8fb41fe8e..5a98c2c39c41 100644
--- a/absl/utility/utility.h
+++ b/absl/utility/utility.h
@@ -158,12 +158,12 @@ using index_sequence_for = make_index_sequence<sizeof...(Ts)>;
 
 // Tag types
 
-#ifdef ABSL_HAVE_STD_OPTIONAL
+#ifdef ABSL_USES_STD_OPTIONAL
 
 using std::in_place_t;
 using std::in_place;
 
-#else  // ABSL_HAVE_STD_OPTIONAL
+#else  // ABSL_USES_STD_OPTIONAL
 
 // in_place_t
 //
@@ -174,9 +174,9 @@ struct in_place_t {};
 
 ABSL_INTERNAL_INLINE_CONSTEXPR(in_place_t, in_place, {});
 
-#endif  // ABSL_HAVE_STD_OPTIONAL
+#endif  // ABSL_USES_STD_OPTIONAL
 
-#if defined(ABSL_HAVE_STD_ANY) || defined(ABSL_HAVE_STD_VARIANT)
+#if defined(ABSL_USES_STD_ANY) || defined(ABSL_USES_STD_VARIANT)
 using std::in_place_type;
 using std::in_place_type_t;
 #else
@@ -191,9 +191,9 @@ using in_place_type_t = void (*)(utility_internal::InPlaceTypeTag<T>);
 
 template <typename T>
 void in_place_type(utility_internal::InPlaceTypeTag<T>) {}
-#endif  // ABSL_HAVE_STD_ANY || ABSL_HAVE_STD_VARIANT
+#endif  // ABSL_USES_STD_ANY || ABSL_USES_STD_VARIANT
 
-#ifdef ABSL_HAVE_STD_VARIANT
+#ifdef ABSL_USES_STD_VARIANT
 using std::in_place_index;
 using std::in_place_index_t;
 #else
@@ -208,7 +208,7 @@ using in_place_index_t = void (*)(utility_internal::InPlaceIndexTag<I>);
 
 template <size_t I>
 void in_place_index(utility_internal::InPlaceIndexTag<I>) {}
-#endif  // ABSL_HAVE_STD_VARIANT
+#endif  // ABSL_USES_STD_VARIANT
 
 // Constexpr move and forward