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| author | Tim Northover <tnorthover@apple.com> | 2015-02-06 01:25:07 +0000 |
|---|---|---|
| committer | Tim Northover <tnorthover@apple.com> | 2015-02-06 01:25:07 +0000 |
| commit | a6a19f1e38769ed23fbb03bb0c2eacee6dbd7d89 (patch) | |
| tree | 75edebfd255158517d23c6bafe62032c10c82768 /clang/lib/Frontend/InitPreprocessor.cpp | |
| parent | 02bc357b6c8ddc660523a871ca6da63c9e1657ec (diff) | |
| download | bcm5719-llvm-a6a19f1e38769ed23fbb03bb0c2eacee6dbd7d89.tar.gz bcm5719-llvm-a6a19f1e38769ed23fbb03bb0c2eacee6dbd7d89.zip | |
Preprocessor: support __BIGGEST_ALIGNMENT__ macro
For compatibility with GCC (and because it's generally helpful information
otherwise inaccessible to the preprocessor). This appears to be canonically the
alignment of max_align_t (e.g. on i386, __BIGGEST_ALIGNMENT__ is 4 even though
vector types will be given greater alignment).
Patch mostly by Mats Petersson
llvm-svn: 228367
Diffstat (limited to 'clang/lib/Frontend/InitPreprocessor.cpp')
| -rw-r--r-- | clang/lib/Frontend/InitPreprocessor.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp index f4241a94ae0..896277aa545 100644 --- a/clang/lib/Frontend/InitPreprocessor.cpp +++ b/clang/lib/Frontend/InitPreprocessor.cpp @@ -710,6 +710,10 @@ static void InitializePredefinedMacros(const TargetInfo &TI, Builder.defineMacro("__POINTER_WIDTH__", Twine((int)TI.getPointerWidth(0))); + // Define __BIGGEST_ALIGNMENT__ to be compatible with gcc. + Builder.defineMacro("__BIGGEST_ALIGNMENT__", + Twine(TI.getSuitableAlign() / TI.getCharWidth()) ); + if (!LangOpts.CharIsSigned) Builder.defineMacro("__CHAR_UNSIGNED__"); |
