/* Test for NaN that does not need libm.
- Copyright (C) 2007-2013 Free Software Foundation, Inc.
+ Copyright (C) 2007-2021 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
#if HAVE_ISNANF_IN_LIBC
/* Get declaration of isnan macro or (older) isnanf function. */
# include <math.h>
-# if __GNUC__ >= 4
- /* GCC 4.0 and newer provides three built-ins for isnan. */
+# if (__GNUC__ >= 4) || (__clang_major__ >= 4)
+ /* GCC >= 4.0 and clang provide a type-generic built-in for isnan.
+ GCC >= 4.0 also provides __builtin_isnanf, but clang doesn't. */
# undef isnanf
-# define isnanf(x) __builtin_isnanf ((float)(x))
+# define isnanf(x) __builtin_isnan ((float)(x))
# elif defined isnan
# undef isnanf
# define isnanf(x) isnan ((float)(x))