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"""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 `<path_to_absl>/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",
"-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",
"-Wcast-qual",
"-Wconversion",
"-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 <windows.h>
],
"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": [],
}