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