1/* Test for NaN that does not need libm.
2   Copyright (C) 2007-2010 Free Software Foundation, Inc.
3
4   This program is free software: you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 3 of the License, or
7   (at your option) any later version.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
16
17#if HAVE_ISNAND_IN_LIBC
18/* Get declaration of isnan macro.  */
19# include <math.h>
20# if __GNUC__ >= 4
21   /* GCC 4.0 and newer provides three built-ins for isnan.  */
22#  undef isnand
23#  define isnand(x) __builtin_isnan ((double)(x))
24# else
25#  undef isnand
26#  define isnand(x) isnan ((double)(x))
27# endif
28#else
29/* Test whether X is a NaN.  */
30# undef isnand
31# define isnand rpl_isnand
32extern int isnand (double x);
33#endif
34