diff options
Diffstat (limited to 'm4/fr_have_builtin_bswap64.m4')
| -rw-r--r-- | m4/fr_have_builtin_bswap64.m4 | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/m4/fr_have_builtin_bswap64.m4 b/m4/fr_have_builtin_bswap64.m4 new file mode 100644 index 0000000..ab205c9 --- /dev/null +++ b/m4/fr_have_builtin_bswap64.m4 @@ -0,0 +1,23 @@ +dnl # +dnl # Check if we have the bwsap64 builtin +dnl # +AC_DEFUN([FR_HAVE_BUILTIN_BSWAP64], +[ + AC_CACHE_CHECK([for __builtin_bswap64 support in compiler], [ax_cv_cc_builtin_bswap64],[ + AC_RUN_IFELSE( + [ + AC_LANG_SOURCE([ + int main(int argc, char **argv) { + if ((argc < 0) || !argv) return 1; /* -Werror=unused-parameter */ + return (__builtin_bswap64(0)); + } + ]) + ], + [ax_cv_cc_builtin_bswap64=yes], + [ax_cv_cc_builtin_bswap64=no] + ) + ]) + if test "x$ax_cv_cc_builtin_bswap64" = "xyes"; then + AC_DEFINE([HAVE_BUILTIN_BSWAP_64],1,[Define if the compiler supports __builtin_bswap64]) + fi +]) |