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# c-strtod.m4 serial 16
# Copyright (C) 2004-2006, 2009-2018 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_LINK_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
])
dnl Prerequisites of lib/c-strtod.c.
AC_DEFUN([gl_C_STRTOD],
[
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_CHECK_HEADERS_ONCE([xlocale.h])
dnl We can't use AC_CHECK_FUNC here, because strtod_l() is defined as a
dnl static inline function when compiling for Android 7.1 or older.
AC_CACHE_CHECK([for strtod_l], [gl_cv_func_strtod_l],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdlib.h>
#include <locale.h>
#if HAVE_XLOCALE_H
# include <xlocale.h>
#endif
locale_t loc;
]],
[[char *end;
return strtod_l("0",&end,loc) < 0.0;
]])
],
[gl_cv_func_strtod_l=yes],
[gl_cv_func_strtod_l=no])
])
if test $gl_cv_func_strtod_l = yes; then
HAVE_STRTOD_L=1
else
HAVE_STRTOD_L=0
fi
AC_DEFINE_UNQUOTED([HAVE_STRTOD_L], [$HAVE_STRTOD_L],
[Define to 1 if the system has the 'strtod_l' function.])
])
dnl Prerequisites of lib/c-strtold.c.
AC_DEFUN([gl_C_STRTOLD],
[
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_REQUIRE([gl_C99_STRTOLD])
AC_CHECK_FUNCS([strtold_l])
])
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