1#serial 5 2 3# Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc. 4# 5# This file is free software; the Free Software Foundation 6# gives unlimited permission to copy and/or distribute it, 7# with or without modifications, as long as this notice is preserved. 8 9# Written by Paul Eggert. 10 11AC_DEFUN([gl_UNLINKDIR], 12[ 13 AC_REQUIRE([AC_CANONICAL_HOST]) 14 AC_CHECK_HEADERS_ONCE(priv.h) 15 16 AC_LIBOBJ([unlinkdir]) 17 18 # The Hurd, the Linux kernel, the FreeBSD kernel version 2.2 and later, 19 # and Cygwin never let anyone (even root) unlink directories. 20 # If anyone knows of another system for which unlink can never 21 # remove a directory, please report it to <bug-coreutils@gnu.org>. 22 # Unfortunately this is difficult to test for, since it requires root access 23 # and might create garbage in the file system, 24 # so the code below simply relies on the kernel name and version number. 25 case $host in 26 *-*-gnu[[0-9]]* | \ 27 *-*-linux-* | *-*-linux | \ 28 *-*-freebsd2.2* | *-*-freebsd[[3-9]]* | *-*-freebsd[[1-9]][[0-9]]* | \ 29 *-cygwin) 30 AC_DEFINE([UNLINK_CANNOT_UNLINK_DIR], 1, 31 [Define to 1 if unlink (dir) cannot possibly succeed.]);; 32 esac 33]) 34