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Diffstat (limited to 'clang/lib/Frontend/InitPreprocessor.cpp')
| -rw-r--r-- | clang/lib/Frontend/InitPreprocessor.cpp | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp index 6bdd734..745d1a5 100644 --- a/clang/lib/Frontend/InitPreprocessor.cpp +++ b/clang/lib/Frontend/InitPreprocessor.cpp @@ -1308,6 +1308,16 @@ static void InitializePredefinedMacros(const TargetInfo &TI, Builder.defineMacro("__GCC_ATOMIC_TEST_AND_SET_TRUEVAL", "1"); } + // GCC defines these macros in both C and C++ modes despite them being needed + // mostly for STL implementations in C++. + auto [Destructive, Constructive] = TI.hardwareInterferenceSizes(); + Builder.defineMacro("__GCC_DESTRUCTIVE_SIZE", Twine(Destructive)); + Builder.defineMacro("__GCC_CONSTRUCTIVE_SIZE", Twine(Constructive)); + // We need to use push_macro to allow users to redefine these macros from the + // command line with -D and not issue a -Wmacro-redefined warning. + Builder.append("#pragma push_macro(\"__GCC_DESTRUCTIVE_SIZE\")"); + Builder.append("#pragma push_macro(\"__GCC_CONSTRUCTIVE_SIZE\")"); + auto addLockFreeMacros = [&](const llvm::Twine &Prefix) { // Used by libc++ and libstdc++ to implement ATOMIC_<foo>_LOCK_FREE. #define DEFINE_LOCK_FREE_MACRO(TYPE, Type) \ |