/* Test for NaN that does not need libm.

   Copyright (C) 2007-2018 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

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   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 <https://www.gnu.org/licenses/>.  */

#if HAVE_ISNANL_IN_LIBC

/* Get declaration of isnan macro or (older) isnanl function.  */

# include <math.h>

# if __GNUC__ >= 4

   /* GCC 4.0 and newer provides three built-ins for isnan.  */

#  undef isnanl

#  define isnanl(x) __builtin_isnanl ((long double)(x))

# elif defined isnan

#  undef isnanl

#  define isnanl(x) isnan ((long double)(x))

# endif

#else

/* Test whether X is a NaN.  */

# undef isnanl

# define isnanl rpl_isnanl

extern int isnanl (long double x);

#endif