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# c-strtod.m4 serial 5
# Copyright (C) 2004 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
# 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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