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annotate m4/unlinkdir.m4 @ 40057:b06060465f09

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maint: Run 'make update-copyright'
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 01 Jan 2019 00:25:11 +0100
parents 10eb9086bea0
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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000ccc8b8dd1 unlinkdir: Move AC_LIBOBJ invocations to module description.
Bruno Haible <bruno@clisp.org>
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1 # serial 7
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2
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3 # Copyright (C) 2005-2007, 2009-2019 Free Software Foundation, Inc.
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4 #
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5 # This file is free software; the Free Software Foundation
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6 # gives unlimited permission to copy and/or distribute it,
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7 # with or without modifications, as long as this notice is preserved.
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8
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9 # Written by Paul Eggert.
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10
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11 AC_DEFUN([gl_UNLINKDIR],
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12 [
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13 AC_REQUIRE([AC_CANONICAL_HOST])
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14 AC_CHECK_HEADERS_ONCE([priv.h])
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15
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16 # The Hurd, the Linux kernel, the FreeBSD kernel version 2.2 and later,
11998
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17 # Cygwin, and mingw never let anyone (even root) unlink directories.
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18 # If anyone knows of another system for which unlink can never
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19 # remove a directory, please report it to <bug-coreutils@gnu.org>.
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20 # Unfortunately this is difficult to test for, since it requires root access
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21 # and might create garbage in the file system,
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22 # so the code below simply relies on the kernel name and version number.
11998
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23 case $host_os in
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24 gnu[[0-9]]* | \
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25 linux-* | linux | \
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26 freebsd2.2* | freebsd[[3-9]]* | freebsd[[1-9]][[0-9]]* | \
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27 cygwin | \
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28 mingw*)
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29 AC_DEFINE([UNLINK_CANNOT_UNLINK_DIR], [1],
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30 [Define to 1 if unlink (dir) cannot possibly succeed.]);;
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31 esac
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32 ])