diff options
| -rw-r--r-- | ext/fiddle/fiddle.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/ext/fiddle/fiddle.h b/ext/fiddle/fiddle.h index 5a31a4bdb8..53db058807 100644 --- a/ext/fiddle/fiddle.h +++ b/ext/fiddle/fiddle.h @@ -199,7 +199,10 @@ /* 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>. clang versions < 8.0.0 have the same bug. */ -#if (!defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112 \ +#if defined(HAVE__ALIGNOF) +# /* Autoconf detected availability of a sane `_Alignof()`. */ +# define ALIGN_OF(type) RB_GNUC_EXTENSION(_Alignof(type)) +#elif (!defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112 \ || (defined(__GNUC__) && __GNUC__ < 4 + (__GNUC_MINOR__ < 9) \ && !defined(__clang__)) \ || (defined(__clang__) && __clang_major__ < 8)) |