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