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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
])
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