"""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. """ ABSL_GCC_FLAGS = [ "-Wall", "-Wextra", "-Wcast-qual", "-Wconversion-null", "-Wformat-security", "-Wmissing-declarations", "-Wnon-virtual-dtor", "-Woverlength-strings", "-Wpointer-arith", "-Wundef", "-Wunused-local-typedefs", "-Wunused-result", "-Wvarargs", "-Wvla", # variable-length array "-Wwrite-strings", # Don't define min and max macros (Build on Windows using gcc) "-DNOMINMAX", ] ABSL_GCC_TEST_ADDITIONAL_FLAGS = [ "-Wno-deprecated-declarations", "-Wno-missing-declarations", "-Wno-self-move", "-Wno-sign-compare", "-Wno-unused-function", "-Wno-unused-parameter", "-Wno-unused-private-field", ] ABSL_LLVM_FLAGS = [ "-Wall", "-Wextra", "-Wc++98-compat-extra-semi", "-Wcast-qual", "-Wconversion", "-Wdeprecated-pragma", "-Wfloat-overflow-conversion", "-Wfloat-zero-conversion", "-Wfor-loop-analysis", "-Wformat-security", "-Wgnu-redeclared-enum", "-Winfinite-recursion", "-Winvalid-constexpr", "-Wliteral-conversion", "-Wmissing-declarations", "-Woverlength-strings", "-Wpointer-arith", "-Wself-assign", "-Wshadow-all", "-Wshorten-64-to-32", "-Wsign-conversion", "-Wstring-conversion", "-Wtautological-overlap-compare", "-Wtautological-unsigned-zero-compare", "-Wundef", "-Wuninitialized", "-Wunreachable-code", "-Wunused-comparison", "-Wunused-local-typedefs", "-Wunused-result", "-Wvla", "-Wwrite-strings", # Warnings that are enabled by group warning flags like -Wall that we # explicitly disable. "-Wno-float-conversion", "-Wno-implicit-float-conversion", "-Wno-implicit-int-float-conversion", # Disable warnings on unknown warning flags (when warning flags are # unknown on older compiler versions) "-Wno-unknown-warning-option", # Don't define min and max macros (Build on Windows using clang) "-DNOMINMAX", ] ABSL_LLVM_TEST_ADDITIONAL_FLAGS = [ "-Wno-deprecated-declarations", "-Wno-implicit-int-conversion", "-Wno-missing-prototypes", "-Wno-missing-variable-declarations", "-Wno-shadow", "-Wno-shorten-64-to-32", "-Wno-sign-compare", "-Wno-sign-conversion", "-Wno-unreachable-code-loop-increment", "-Wno-unused-function", "-Wno-unused-member-function", "-Wno-unused-parameter", "-Wno-unused-private-field", "-Wno-unused-template", "-Wno-used-but-marked-unused", # gtest depends on this GNU extension being offered. "-Wno-gnu-zero-variadic-macro-arguments", ] # /Wall with msvc includes unhelpful warnings such as C4711, C4710, ... MSVC_BIG_WARNING_FLAGS = [ "/W3", ] MSVC_WARNING_FLAGS = [ # 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", ] 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", ] def GccStyleFilterAndCombine(default_flags, test_flags): """Merges default_flags and test_flags for GCC and LLVM. Args: default_flags: A list of default compiler flags test_flags: A list of flags that are only used in tests Returns: A combined list of default_flags and test_flags, but with all flags of the form '-Wwarning' removed if test_flags contains a flag of the form '-Wno-warning' """ remove = set(["-W" + f[5:] for f in test_flags if f[:5] == "-Wno-"]) return [f for f in default_flags if f not in remove] + test_flags COPT_VARS = { "ABSL_GCC_FLAGS": ABSL_GCC_FLAGS, "ABSL_GCC_TEST_FLAGS": GccStyleFilterAndCombine( ABSL_GCC_FLAGS, ABSL_GCC_TEST_ADDITIONAL_FLAGS), "ABSL_LLVM_FLAGS": ABSL_LLVM_FLAGS, "ABSL_LLVM_TEST_FLAGS": GccStyleFilterAndCombine( ABSL_LLVM_FLAGS, ABSL_LLVM_TEST_ADDITIONAL_FLAGS), "ABSL_CLANG_CL_FLAGS": MSVC_BIG_WARNING_FLAGS + MSVC_DEFINES, "ABSL_CLANG_CL_TEST_FLAGS": MSVC_BIG_WARNING_FLAGS + MSVC_DEFINES + ABSL_LLVM_TEST_ADDITIONAL_FLAGS, "ABSL_MSVC_FLAGS": MSVC_BIG_WARNING_FLAGS + MSVC_WARNING_FLAGS + MSVC_DEFINES, "ABSL_MSVC_TEST_FLAGS": MSVC_BIG_WARNING_FLAGS + MSVC_WARNING_FLAGS + MSVC_DEFINES + [ "/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": [], }