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Use __has_builtin to check clang support

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Older versions of Xcode with clang reporting versions 4.[012] and 5.0
did not include support for __builtin_bswap16. Checking in this manner
avoids using brittle version checks.

Matches a change to libvpx:
https://chromium-review.googlesource.com/305573
to fix:
https://code.google.com/p/webm/issues/detail?id=1082

Change-Id: I23ea466ee1b53b12cd3fb45f65a2186c8dda95a1
This commit is contained in:
Johann
2015-10-14 16:33:42 -07:00
parent 12ec204ec7
commit d26d9def80
2 changed files with 10 additions and 15 deletions
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14
src/utils/endian_inl.h
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@ -35,15 +35,15 @@
#endif
#if !defined(HAVE_CONFIG_H)
// clang-3.3 and gcc-4.3 have builtin functions for swap32/swap64
#if LOCAL_GCC_PREREQ(4,3) || LOCAL_CLANG_PREREQ(3,3)
#define HAVE_BUILTIN_BSWAP32
#define HAVE_BUILTIN_BSWAP64
#endif
// clang-3.3 and gcc-4.8 have a builtin function for swap16
#if LOCAL_GCC_PREREQ(4,8) || LOCAL_CLANG_PREREQ(3,3)
#if LOCAL_GCC_PREREQ(4,8) || __has_builtin(__builtin_bswap16)
#define HAVE_BUILTIN_BSWAP16
#endif
#if LOCAL_GCC_PREREQ(4,3) || __has_builtin(__builtin_bswap32)
#define HAVE_BUILTIN_BSWAP32
#endif
#if LOCAL_GCC_PREREQ(4,3) || __has_builtin(__builtin_bswap64)
#define HAVE_BUILTIN_BSWAP64
#endif
#endif // !HAVE_CONFIG_H
static WEBP_INLINE uint16_t BSwap16(uint16_t x) {