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# c-strtod.m4 serial 4
# Copyright (C) 2004 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 2, 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, write to the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
# Written by Paul Eggert.
AC_DEFUN([gl_C99_STRTOLD],
[
AC_CACHE_CHECK([whether strtold conforms to C99],
[gl_cv_func_c99_strtold],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[/* On HP-UX before 11.23, strtold returns a struct instead of
long double. Reject implementations like that, by requiring
compatibility with the C99 prototype. */
#include <stdlib.h>
static long double (*p) (char const *, char **) = strtold;
static long double
test (char const *nptr, char **endptr)
{
long double r;
r = strtold (nptr, endptr);
return r;
}]],
[[return test ("1.0", NULL) != 1 || p ("1.0", NULL) != 1;]])],
[gl_cv_func_c99_strtold=yes],
[gl_cv_func_c99_strtold=no])])
if test $gl_cv_func_c99_strtold = yes; then
AC_DEFINE([HAVE_C99_STRTOLD], 1, [Define to 1 if strtold conforms to C99.])
fi
])
AC_DEFUN([gl_C_STRTOD],
[
dnl Prerequisites of lib/c-strtod.c.
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
:
])
AC_DEFUN([gl_C_STRTOLD],
[
dnl Prerequisites of lib/c-strtold.c.
AC_REQUIRE([gl_C_STRTOD])
AC_REQUIRE([gl_C99_STRTOLD])
:
])
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