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# getcwd.m4 - check for working getcwd that is compatible with glibc
# Copyright (C) 2001, 2003, 2004, 2005 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_FUNC_GETCWD_NULL],
[
AC_LIBSOURCES([getcwd.c, getcwd.h])
AC_CHECK_HEADERS_ONCE(unistd.h)
AC_CACHE_CHECK([whether getcwd (NULL, 0) allocates memory for result],
[gl_cv_func_getcwd_null],
[AC_TRY_RUN(
[
# include <stdlib.h>
# ifdef HAVE_UNISTD_H
# include <unistd.h>
# endif
# ifndef getcwd
char *getcwd ();
# endif
int
main ()
{
if (chdir ("/") != 0)
exit (1);
else
{
char *f = getcwd (NULL, 0);
exit (! (f && f[0] == '/' && !f[1]));
}
}],
[gl_cv_func_getcwd_null=yes],
[gl_cv_func_getcwd_null=no],
[gl_cv_func_getcwd_null=no])])
])
AC_DEFUN([gl_FUNC_GETCWD],
[
AC_REQUIRE([gl_FUNC_GETCWD_NULL])
case $gl_cv_func_getcwd_null in
yes) gl_FUNC_GETCWD_PATH_MAX;;
esac
case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_path_max in
yes,yes) ;;
*)
AC_LIBOBJ([getcwd])
AC_DEFINE([__GETCWD_PREFIX], [[rpl_]],
[Define to rpl_ if the getcwd replacement function should be used.])
gl_PREREQ_GETCWD;;
esac
])
# Prerequisites of lib/getcwd.c.
AC_DEFUN([gl_PREREQ_GETCWD],
[
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_REQUIRE([AC_HEADER_DIRENT])
AC_REQUIRE([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO])
AC_CHECK_HEADERS_ONCE(fcntl.h)
:
])
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