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| 1 | #serial 4
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| 2 |
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| 3 | # Copyright (C) 2005, 2006 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 | AC_LIBOBJ([unlinkdir])
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| 17 |
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| 18 | # The Hurd, the Linux kernel, the FreeBSD kernel version 2.2 and later,
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| 19 | # and Cygwin never let anyone (even root) unlink directories.
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| 20 | # If anyone knows of another system for which unlink can never
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| 21 | # remove a directory, please report it to <bug-coreutils@gnu.org>.
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| 22 | # Unfortunately this is difficult to test for, since it requires root access
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| 23 | # and might create garbage in the file system,
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| 24 | # so the code below simply relies on the kernel name and version number.
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| 25 | case $host in
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| 26 | *-*-gnu[0-9]* | \
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| 27 | *-*-linux-* | *-*-linux | \
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| 28 | *-*-freebsd2.2* | *-*-freebsd[3-9]* | *-*-freebsd[1-9][0-9]* | \
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| 29 | *-cygwin)
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| 30 | AC_DEFINE([UNLINK_CANNOT_UNLINK_DIR], 1,
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| 31 | [Define to 1 if unlink (dir) cannot possibly succeed.]);;
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| 32 | esac
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| 33 | ])
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