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      1 /* Test for NaN that does not need libm.
      2    Copyright (C) 2007-2022 Free Software Foundation, Inc.
      3 
      4    This file is free software: you can redistribute it and/or modify
      5    it under the terms of the GNU Lesser General Public License as
      6    published by the Free Software Foundation; either version 2.1 of the
      7    License, or (at your option) any later version.
      8 
      9    This file 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 Lesser General Public License for more details.
     13 
     14    You should have received a copy of the GNU Lesser 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 # if (__GNUC__ >= 4) || (__clang_major__ >= 4)
     21    /* GCC >= 4.0 and clang provide a type-generic built-in for isnan.
     22       GCC >= 4.0 also provides __builtin_isnanl, but clang doesn't.  */
     23 #  undef isnanl
     24 #  define isnanl(x) __builtin_isnan ((long double)(x))
     25 # elif defined isnan
     26 #  undef isnanl
     27 #  define isnanl(x) isnan ((long double)(x))
     28 # endif
     29 #else
     30 /* Test whether X is a NaN.  */
     31 # undef isnanl
     32 # define isnanl rpl_isnanl
     33 extern int isnanl (long double x);
     34 #endif
     35