diff options
Diffstat (limited to 'lib/stdalign.in.h')
| -rw-r--r-- | lib/stdalign.in.h | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/lib/stdalign.in.h b/lib/stdalign.in.h index cd786bed2cd..e4809b401f7 100644 --- a/lib/stdalign.in.h +++ b/lib/stdalign.in.h @@ -34,11 +34,12 @@ requirement of a structure member (i.e., slot or field) that is of type TYPE, as an integer constant expression. - This differs from GCC's __alignof__ operator, which can yield a - better-performing alignment for an object of that type. For - example, on x86 with GCC, __alignof__ (double) and __alignof__ - (long long) are 8, whereas alignof (double) and alignof (long long) - are 4 unless the option '-malign-double' is used. + This differs from GCC's and clang's __alignof__ operator, which can + yield a better-performing alignment for an object of that type. For + example, on x86 with GCC and on Linux/x86 with clang, + __alignof__ (double) and __alignof__ (long long) are 8, whereas + alignof (double) and alignof (long long) are 4 unless the option + '-malign-double' is used. The result cannot be used as a value for an 'enum' constant, if you want to be portable to HP-UX 10.20 cc and AIX 3.2.5 xlc. @@ -55,7 +56,8 @@ /* GCC releases before GCC 4.9 had a bug in _Alignof. See GCC bug 52023 <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52023>. */ #if (!defined __STDC_VERSION__ || __STDC_VERSION__ < 201112 \ - || (defined __GNUC__ && __GNUC__ < 4 + (__GNUC_MINOR__ < 9))) + || (defined __GNUC__ && __GNUC__ < 4 + (__GNUC_MINOR__ < 9) \ + && !defined __clang__)) # ifdef __cplusplus # if 201103 <= __cplusplus # define _Alignof(type) alignof (type) @@ -102,8 +104,9 @@ # define _Alignas(a) alignas (a) # elif ((defined __APPLE__ && defined __MACH__ \ ? 4 < __GNUC__ + (1 <= __GNUC_MINOR__) \ - : __GNUC__ && !defined __ibmxl__) \ - || (__ia64 && (61200 <= __HP_cc || 61200 <= __HP_aCC)) \ + : __GNUC__ && !defined __ibmxl__) \ + || (4 <= __clang_major__) \ + || (__ia64 && (61200 <= __HP_cc || 61200 <= __HP_aCC)) \ || __ICC || 0x590 <= __SUNPRO_C || 0x0600 <= __xlC__) # define _Alignas(a) __attribute__ ((__aligned__ (a))) # elif 1300 <= _MSC_VER |