Mercurial > gnulib
view lib/isnanl-nolibm.h @ 40196:e63f5d3edab5
relocatable-prog: Update documentation.
* doc/relocatable-maint.texi (Supporting Relocation): Update to match
the recent changes.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sun, 24 Feb 2019 01:49:15 +0100 |
parents | b06060465f09 |
children |
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/* Test for NaN that does not need libm. Copyright (C) 2007-2019 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 <https://www.gnu.org/licenses/>. */ #if HAVE_ISNANL_IN_LIBC /* Get declaration of isnan macro or (older) isnanl function. */ # include <math.h> # if __GNUC__ >= 4 /* GCC 4.0 and newer provides three built-ins for isnan. */ # undef isnanl # define isnanl(x) __builtin_isnanl ((long double)(x)) # elif defined isnan # undef isnanl # define isnanl(x) isnan ((long double)(x)) # endif #else /* Test whether X is a NaN. */ # undef isnanl # define isnanl rpl_isnanl extern int isnanl (long double x); #endif