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"""absl specific copts.
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Flags specified here must not impact ABI. Code compiled with and without these
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opts will be linked together, and in some cases headers compiled with and
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without these options will be part of the same program.
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"""
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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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"-Wno-sign-compare",
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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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]
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GCC_TEST_FLAGS = [
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"-Wno-conversion-null",
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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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# 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_FLAGS = [
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"-Wall",
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"-Wextra",
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"-Weverything",
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# Abseil does not support C++98
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"-Wno-c++98-compat-pedantic",
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"-Wno-comma",
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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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"-Wno-exit-time-destructors",
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"-Wno-extra-semi",
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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 code paths.
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"-Wno-gcc-compat",
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"-Wno-global-constructors",
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"-Wno-nested-anon-types",
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"-Wno-non-modular-include-in-module",
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"-Wno-old-style-cast",
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"-Wno-packed",
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"-Wno-padded",
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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-sign-conversion",
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"-Wno-switch-enum",
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"-Wno-thread-safety-negative",
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"-Wno-undef",
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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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###
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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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"-Wstring-conversion",
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###
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]
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LLVM_TEST_FLAGS = [
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"-Wno-c99-extensions",
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"-Wno-missing-noreturn",
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"-Wno-missing-prototypes",
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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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]
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MSVC_FLAGS = [
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"/W3",
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"/WX",
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"/wd4005", # macro-redifinition
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"/wd4068", # unknown pragma
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"/wd4244", # conversion from 'type1' to 'type2', possible loss of data
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"/wd4267", # conversion from 'size_t' to 'type', possible loss of data
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"/wd4800", # forcing value to bool 'true' or 'false' (performance warning)
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"/DNOMINMAX", # Don't define min and max macros (windows.h)
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"/DWIN32_LEAN_AND_MEAN", # Don't bloat namespace with incompatible winsock versions.
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"/D_CRT_SECURE_NO_WARNINGS", # Don't warn about usage of insecure C functions
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]
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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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]
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# /Wall with msvc includes unhelpful warnings such as C4711, C4710, ...
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ABSL_DEFAULT_COPTS = select({
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"//absl:windows": MSVC_FLAGS,
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"//absl:llvm_compiler": LLVM_FLAGS,
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"//conditions:default": GCC_FLAGS,
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})
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# in absence of modules (--compiler=gcc or -c opt), cc_tests leak their copts
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# to their (included header) dependencies and fail to build outside absl
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ABSL_TEST_COPTS = ABSL_DEFAULT_COPTS + select({
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"//absl:windows": MSVC_TEST_FLAGS,
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"//absl:llvm_compiler": LLVM_TEST_FLAGS,
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"//conditions:default": GCC_TEST_FLAGS,
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})
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ABSL_EXCEPTIONS_FLAG = select({
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"//absl:windows": ["/U_HAS_EXCEPTIONS", "/D_HAS_EXCEPTIONS=1", "/EHsc"],
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"//conditions:default": ["-fexceptions"],
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})
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