Add 'third_party/abseil_cpp/' from commit '768eb2ca28'
git-subtree-dir: third_party/abseil_cpp git-subtree-mainline:ffb2ae54begit-subtree-split:768eb2ca28
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Vincent Ambo
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200
third_party/abseil_cpp/absl/copts/copts.py
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third_party/abseil_cpp/absl/copts/copts.py
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"""Abseil compiler options.
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This is the source of truth for Abseil compiler options. To modify Abseil
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compilation options:
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(1) Edit the appropriate list in this file based on the platform the flag is
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needed on.
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(2) Run `<path_to_absl>/copts/generate_copts.py`.
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The generated copts are consumed by configure_copts.bzl and
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AbseilConfigureCopts.cmake.
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"""
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# /Wall with msvc includes unhelpful warnings such as C4711, C4710, ...
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MSVC_BIG_WARNING_FLAGS = [
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"/W3",
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]
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LLVM_BIG_WARNING_FLAGS = [
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"-Wall",
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"-Wextra",
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"-Weverything",
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]
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# Docs on single flags is preceded by a comment.
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# Docs on groups of flags is preceded by ###.
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LLVM_DISABLE_WARNINGS_FLAGS = [
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# Abseil does not support C++98
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"-Wno-c++98-compat-pedantic",
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# Turns off all implicit conversion warnings. Most are re-enabled below.
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"-Wno-conversion",
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"-Wno-covered-switch-default",
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"-Wno-deprecated",
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"-Wno-disabled-macro-expansion",
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"-Wno-double-promotion",
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###
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# Turned off as they include valid C++ code.
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"-Wno-comma",
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"-Wno-extra-semi",
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"-Wno-extra-semi-stmt",
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"-Wno-packed",
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"-Wno-padded",
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###
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# Google style does not use unsigned integers, though STL containers
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# have unsigned types.
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"-Wno-sign-compare",
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###
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"-Wno-float-conversion",
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"-Wno-float-equal",
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"-Wno-format-nonliteral",
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# Too aggressive: warns on Clang extensions enclosed in Clang-only
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# compilation paths.
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"-Wno-gcc-compat",
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###
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# Some internal globals are necessary. Don't do this at home.
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"-Wno-global-constructors",
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"-Wno-exit-time-destructors",
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###
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"-Wno-non-modular-include-in-module",
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"-Wno-old-style-cast",
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# Warns on preferred usage of non-POD types such as string_view
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"-Wno-range-loop-analysis",
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"-Wno-reserved-id-macro",
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"-Wno-shorten-64-to-32",
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"-Wno-switch-enum",
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"-Wno-thread-safety-negative",
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"-Wno-unknown-warning-option",
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"-Wno-unreachable-code",
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# Causes warnings on include guards
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"-Wno-unused-macros",
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"-Wno-weak-vtables",
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# Causes warnings on usage of types/compare.h comparison operators.
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"-Wno-zero-as-null-pointer-constant",
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###
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# Implicit conversion warnings turned off by -Wno-conversion
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# which are re-enabled below.
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"-Wbitfield-enum-conversion",
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"-Wbool-conversion",
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"-Wconstant-conversion",
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"-Wenum-conversion",
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"-Wint-conversion",
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"-Wliteral-conversion",
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"-Wnon-literal-null-conversion",
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"-Wnull-conversion",
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"-Wobjc-literal-conversion",
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"-Wno-sign-conversion",
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"-Wstring-conversion",
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]
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LLVM_TEST_DISABLE_WARNINGS_FLAGS = [
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"-Wno-c99-extensions",
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"-Wno-deprecated-declarations",
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"-Wno-missing-noreturn",
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"-Wno-missing-prototypes",
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"-Wno-missing-variable-declarations",
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"-Wno-null-conversion",
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"-Wno-shadow",
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"-Wno-shift-sign-overflow",
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"-Wno-sign-compare",
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"-Wno-unused-function",
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"-Wno-unused-member-function",
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"-Wno-unused-parameter",
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"-Wno-unused-private-field",
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"-Wno-unused-template",
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"-Wno-used-but-marked-unused",
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"-Wno-zero-as-null-pointer-constant",
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# gtest depends on this GNU extension being offered.
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"-Wno-gnu-zero-variadic-macro-arguments",
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]
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MSVC_DEFINES = [
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"/DNOMINMAX", # Don't define min and max macros (windows.h)
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# Don't bloat namespace with incompatible winsock versions.
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"/DWIN32_LEAN_AND_MEAN",
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# Don't warn about usage of insecure C functions.
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"/D_CRT_SECURE_NO_WARNINGS",
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"/D_SCL_SECURE_NO_WARNINGS",
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# Introduced in VS 2017 15.8, allow overaligned types in aligned_storage
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"/D_ENABLE_EXTENDED_ALIGNED_STORAGE",
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]
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COPT_VARS = {
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"ABSL_GCC_FLAGS": [
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"-Wall",
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"-Wextra",
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"-Wcast-qual",
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"-Wconversion-null",
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"-Wmissing-declarations",
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"-Woverlength-strings",
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"-Wpointer-arith",
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"-Wunused-local-typedefs",
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"-Wunused-result",
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"-Wvarargs",
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"-Wvla", # variable-length array
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"-Wwrite-strings",
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# gcc-4.x has spurious missing field initializer warnings.
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# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36750
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# Remove when gcc-4.x is no longer supported.
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"-Wno-missing-field-initializers",
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# Google style does not use unsigned integers, though STL containers
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# have unsigned types.
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"-Wno-sign-compare",
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],
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"ABSL_GCC_TEST_FLAGS": [
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"-Wno-conversion-null",
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"-Wno-deprecated-declarations",
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"-Wno-missing-declarations",
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"-Wno-sign-compare",
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"-Wno-unused-function",
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"-Wno-unused-parameter",
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"-Wno-unused-private-field",
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],
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"ABSL_LLVM_FLAGS":
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LLVM_BIG_WARNING_FLAGS + LLVM_DISABLE_WARNINGS_FLAGS,
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"ABSL_LLVM_TEST_FLAGS":
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LLVM_TEST_DISABLE_WARNINGS_FLAGS,
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"ABSL_CLANG_CL_FLAGS":
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(MSVC_BIG_WARNING_FLAGS + LLVM_DISABLE_WARNINGS_FLAGS + MSVC_DEFINES),
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"ABSL_CLANG_CL_TEST_FLAGS":
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LLVM_TEST_DISABLE_WARNINGS_FLAGS,
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"ABSL_MSVC_FLAGS":
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MSVC_BIG_WARNING_FLAGS + MSVC_DEFINES + [
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# Increase the number of sections available in object files
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"/bigobj",
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"/wd4005", # macro-redefinition
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"/wd4068", # unknown pragma
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# qualifier applied to function type has no meaning; ignored
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"/wd4180",
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# conversion from 'type1' to 'type2', possible loss of data
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"/wd4244",
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# conversion from 'size_t' to 'type', possible loss of data
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"/wd4267",
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# The decorated name was longer than the compiler limit
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"/wd4503",
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# forcing value to bool 'true' or 'false' (performance warning)
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"/wd4800",
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],
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"ABSL_MSVC_TEST_FLAGS": [
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"/wd4018", # signed/unsigned mismatch
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"/wd4101", # unreferenced local variable
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"/wd4503", # decorated name length exceeded, name was truncated
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"/wd4996", # use of deprecated symbol
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"/DNOMINMAX", # disable the min() and max() macros from <windows.h>
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],
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"ABSL_MSVC_LINKOPTS": [
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# Object file doesn't export any previously undefined symbols
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"-ignore:4221",
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],
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# "HWAES" is an abbreviation for "hardware AES" (AES - Advanced Encryption
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# Standard). These flags are used for detecting whether or not the target
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# architecture has hardware support for AES instructions which can be used
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# to improve performance of some random bit generators.
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"ABSL_RANDOM_HWAES_ARM64_FLAGS": ["-march=armv8-a+crypto"],
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"ABSL_RANDOM_HWAES_ARM32_FLAGS": ["-mfpu=neon"],
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"ABSL_RANDOM_HWAES_X64_FLAGS": [
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"-maes",
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"-msse4.1",
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],
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"ABSL_RANDOM_HWAES_MSVC_X64_FLAGS": [],
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}
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