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1 # double-slash-root.m4 serial 4 -*- Autoconf -*-
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2 dnl Copyright (C) 2006, 2008-2010 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_DOUBLE_SLASH_ROOT],
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8 [
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9 AC_REQUIRE([AC_CANONICAL_HOST])
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10 AC_CACHE_CHECK([whether // is distinct from /], [gl_cv_double_slash_root],
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11 [ if test x"$cross_compiling" = xyes ; then
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12 # When cross-compiling, there is no way to tell whether // is special
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13 # short of a list of hosts. However, the only known hosts to date
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14 # that have a distinct // are Apollo DomainOS (too old to port to),
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15 # Cygwin, and z/OS. If anyone knows of another system for which // has
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16 # special semantics and is distinct from /, please report it to
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17 # <bug-gnulib@gnu.org>.
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18 case $host in
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19 *-cygwin | i370-ibm-openedition)
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20 gl_cv_double_slash_root=yes ;;
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21 *)
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22 # Be optimistic and assume that / and // are the same when we
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23 # don't know.
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24 gl_cv_double_slash_root='unknown, assuming no' ;;
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25 esac
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26 else
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27 set x `ls -di / // 2>/dev/null`
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28 if test "$[2]" = "$[4]" && wc //dev/null >/dev/null 2>&1; then
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29 gl_cv_double_slash_root=no
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30 else
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31 gl_cv_double_slash_root=yes
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32 fi
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33 fi])
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34 if test "$gl_cv_double_slash_root" = yes; then
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35 AC_DEFINE([DOUBLE_SLASH_IS_DISTINCT_ROOT], [1],
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36 [Define to 1 if // is a file system root distinct from /.])
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37 fi
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38 ])
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