/* 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 either:

     * the GNU Lesser General Public License as published by the Free
       Software Foundation; either version 3 of the License, or (at your
       option) any later version.

   or

     * the GNU General Public License as published by the Free
       Software Foundation; either version 2 of the License, or (at your
       option) any later version.

   or both in parallel, as here.
   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_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.  */
#  undef isnanf
#  define isnanf(x) __builtin_isnanf ((float)(x))
# elif defined isnan
#  undef isnanf
#  define isnanf(x) isnan ((float)(x))
# else
   /* Get declaration of isnanf(), if not declared in <math.h>.  */
#  if defined __sgi
   /* We can't include <ieeefp.h>, because it conflicts with our definition of
      isnand.  Therefore declare isnanf separately.  */
extern int isnanf (float x);
#  endif
# endif
#else
/* Test whether X is a NaN.  */
# undef isnanf
# define isnanf rpl_isnanf
extern int isnanf (float x);
#endif