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Improved detection of clang

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clang version numbers are unreliable; Apple does not use the upstream version
numbers.  Instead, there are feature-test macros that can be used.
This commit is contained in:
Eric Biggers 2016-02-01 21:00:33 -06:00
parent 4ad7bbe2df
commit c1032c8dae
1 changed files with 16 additions and 8 deletions
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24
src/compiler-gcc.h
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@ -8,10 +8,15 @@
(__GNUC__ > major || \
(__GNUC__ == major && __GNUC_MINOR__ >= minor)))
#define CLANG_PREREQ(major, minor) \
(defined(__clang__) && \
(__clang_major__ > major || \
(__clang_major__ == major && __clang_minor__ >= minor)))
#ifndef __has_attribute
# define __has_attribute(attribute) 0
#endif
#ifndef __has_feature
# define __has_feature(feature) 0
#endif
#ifndef __has_builtin
# define __has_builtin(builtin) 0
#endif
#ifdef _WIN32
# define LIBEXPORT __declspec(dllexport)
@ -53,12 +58,15 @@ store_##type##_unaligned(type v, void *p) \
# define UNALIGNED_ACCESS_IS_FAST 1
#endif
#if GCC_PREREQ(4, 8)
#if GCC_PREREQ(4, 8) || __has_builtin(__builtin_bswap16)
# define compiler_bswap16 __builtin_bswap16
#endif
#if GCC_PREREQ(4, 3)
#if GCC_PREREQ(4, 3) || __has_builtin(__builtin_bswap32)
# define compiler_bswap32 __builtin_bswap32
#endif
#if GCC_PREREQ(4, 3) || __has_builtin(__builtin_bswap64)
# define compiler_bswap64 __builtin_bswap64
#endif
@ -69,9 +77,9 @@ store_##type##_unaligned(type v, void *p) \
/* Does the compiler support the 'target' function attribute? */
#define COMPILER_SUPPORTS_TARGET_FUNCTION_ATTRIBUTE \
(CLANG_PREREQ(3, 7) || GCC_PREREQ(4, 4))
(GCC_PREREQ(4, 4) || __has_attribute(target))
/* Does the compiler support __attribute__((target("bmi2")))? */
#define COMPILER_SUPPORTS_BMI2_TARGET \
(COMPILER_SUPPORTS_TARGET_FUNCTION_ATTRIBUTE && \
(CLANG_PREREQ(3, 7) || GCC_PREREQ(4, 7)))
(GCC_PREREQ(4, 7) || __has_builtin(__builtin_ia32_pdep_di)))