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#serial 5
# Copyright (C) 2005, 2006, 2007 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_UNLINKDIR],
[
AC_REQUIRE([AC_CANONICAL_HOST])
AC_CHECK_HEADERS_ONCE(priv.h)
AC_LIBOBJ([unlinkdir])
# The Hurd, the Linux kernel, the FreeBSD kernel version 2.2 and later,
# and Cygwin never let anyone (even root) unlink directories.
# If anyone knows of another system for which unlink can never
# remove a directory, please report it to <bug-coreutils@gnu.org>.
# Unfortunately this is difficult to test for, since it requires root access
# and might create garbage in the file system,
# so the code below simply relies on the kernel name and version number.
case $host in
*-*-gnu[[0-9]]* | \
*-*-linux-* | *-*-linux | \
*-*-freebsd2.2* | *-*-freebsd[[3-9]]* | *-*-freebsd[[1-9]][[0-9]]* | \
*-cygwin)
AC_DEFINE([UNLINK_CANNOT_UNLINK_DIR], 1,
[Define to 1 if unlink (dir) cannot possibly succeed.]);;
esac
])
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