diff options
Diffstat (limited to 'config/c-compiler.m4')
| -rw-r--r-- | config/c-compiler.m4 | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/config/c-compiler.m4 b/config/c-compiler.m4 index 9feec0c1086..550d03474c6 100644 --- a/config/c-compiler.m4 +++ b/config/c-compiler.m4 @@ -214,6 +214,24 @@ fi])# PGAC_C_BUILTIN_BSWAP32 +# PGAC_C_BUILTIN_BSWAP64 +# ------------------------- +# Check if the C compiler understands __builtin_bswap64(), +# and define HAVE__BUILTIN_BSWAP64 if so. +AC_DEFUN([PGAC_C_BUILTIN_BSWAP64], +[AC_CACHE_CHECK(for __builtin_bswap64, pgac_cv__builtin_bswap64, +[AC_COMPILE_IFELSE([AC_LANG_SOURCE( +[static unsigned long int x = __builtin_bswap64(0xaabbccddeeff0011);] +)], +[pgac_cv__builtin_bswap64=yes], +[pgac_cv__builtin_bswap64=no])]) +if test x"$pgac_cv__builtin_bswap64" = xyes ; then +AC_DEFINE(HAVE__BUILTIN_BSWAP64, 1, + [Define to 1 if your compiler understands __builtin_bswap64.]) +fi])# PGAC_C_BUILTIN_BSWAP64 + + + # PGAC_C_BUILTIN_CONSTANT_P # ------------------------- # Check if the C compiler understands __builtin_constant_p(), |