+
−/* Test for NaN that does not need libm.
+
−   Copyright (C) 2007-2012 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 <http://www.gnu.org/licenses/>.  */
+
−
+
−#if HAVE_ISNAND_IN_LIBC
+
−/* Get declaration of isnan macro.  */
+
−# include <math.h>
+
−# if __GNUC__ >= 4
+
−   /* GCC 4.0 and newer provides three built-ins for isnan.  */
+
−#  undef isnand
+
−#  define isnand(x) __builtin_isnan ((double)(x))
+
−# else
+
−#  undef isnand
+
−#  define isnand(x) isnan ((double)(x))
+
−# endif
+
−#else
+
−/* Test whether X is a NaN.  */
+
−# undef isnand
+
−# define isnand rpl_isnand
+
−extern int isnand (double x);
+
−#endif