From 673728fe570a4e75ee8916fd2a5769fe81d3f975 Mon Sep 17 00:00:00 2001 From: Dylan Noblesmith Date: Fri, 27 Jul 2012 18:34:31 +0000 Subject: Preprocessor: add __BYTE_ORDER__ predefined macro The __BYTE_ORDER__ predefined macro was added in GCC 4.6: http://gcc.gnu.org/onlinedocs/gcc-4.6.0/cpp/Common-Predefined-Macros.html It's used like the following: #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ ... #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ ... #else #error insane architecture like the pdp-11 #endif There's a similar macro, __FLOAT_WORD_ORDER__, but it looks like it mainly exist to accommodate fairly obscure architectures and ARM's old FPA instructions, so it doesn't seem nearly as useful. The tests are updated to check for the correct(at least, based on clang's current output) value of the macro on each target. So now the suite will catch bugs like the one fixed in r157626. llvm-svn: 160879 --- clang/lib/Frontend/InitPreprocessor.cpp | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'clang/lib/Frontend/InitPreprocessor.cpp') diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp index 3979731..e8ae8e3 100644 --- a/clang/lib/Frontend/InitPreprocessor.cpp +++ b/clang/lib/Frontend/InitPreprocessor.cpp @@ -445,6 +445,17 @@ static void InitializePredefinedMacros(const TargetInfo &TI, // Initialize target-specific preprocessor defines. + // __BYTE_ORDER__ was added in GCC 4.6. + // We don't support the PDP-11 as a target, but include + // the define so it can still be compared against. + Builder.defineMacro("__ORDER_LITTLE_ENDIAN__", "1234"); + Builder.defineMacro("__ORDER_BIG_ENDIAN__", "4321"); + Builder.defineMacro("__ORDER_PDP_ENDIAN__", "3412"); + if (TI.isBigEndian()) + Builder.defineMacro("__BYTE_ORDER__", "__ORDER_BIG_ENDIAN__"); + else + Builder.defineMacro("__BYTE_ORDER__", "__ORDER_LITTLE_ENDIAN__"); + // Define type sizing macros based on the target properties. assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far"); Builder.defineMacro("__CHAR_BIT__", "8"); -- cgit v1.1