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isnanl-nolibm.h revision 1.1 
      1 /* Test for NaN that does not need libm.
      2    Copyright (C) 2007-2020 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 <https://www.gnu.org/licenses/>.  */
     16 
     17 #if HAVE_ISNANL_IN_LIBC
     18 /* Get declaration of isnan macro or (older) isnanl function.  */
     19 # include <math.h>
     20 # ifndef __has_builtin
     21 #  define __has_builtin(name) 0
     22 # endif
     23 # if __GNUC__ >= 4 && (!defined __clang__ || __has_builtin (__builtin_isnanl))
     24    /* GCC 4.0 and newer provides three built-ins for isnan.  */
     25 #  undef isnanl
     26 #  define isnanl(x) __builtin_isnanl ((long double)(x))
     27 # elif defined isnan
     28 #  undef isnanl
     29 #  define isnanl(x) isnan ((long double)(x))
     30 # endif
     31 #else
     32 /* Test whether X is a NaN.  */
     33 # undef isnanl
     34 # define isnanl rpl_isnanl
     35 extern int isnanl (long double x);
     36 #endif
     37