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# double-slash-root.m4 serial 4 -*- Autoconf -*-
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dnl Copyright (C) 2006, 2008-2010 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_DOUBLE_SLASH_ROOT],
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AC_REQUIRE([AC_CANONICAL_HOST])
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AC_CACHE_CHECK([whether // is distinct from /], [gl_cv_double_slash_root],
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[ if test x"$cross_compiling" = xyes ; then
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# When cross-compiling, there is no way to tell whether // is special
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# short of a list of hosts. However, the only known hosts to date
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# that have a distinct // are Apollo DomainOS (too old to port to),
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# Cygwin, and z/OS. If anyone knows of another system for which // has
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# special semantics and is distinct from /, please report it to
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# <bug-gnulib@gnu.org>.
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*-cygwin | i370-ibm-openedition)
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gl_cv_double_slash_root=yes ;;
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# Be optimistic and assume that / and // are the same when we
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gl_cv_double_slash_root='unknown, assuming no' ;;
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set x `ls -di / // 2>/dev/null`
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if test "$[2]" = "$[4]" && wc //dev/null >/dev/null 2>&1; then
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gl_cv_double_slash_root=no
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gl_cv_double_slash_root=yes
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if test "$gl_cv_double_slash_root" = yes; then
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AC_DEFINE([DOUBLE_SLASH_IS_DISTINCT_ROOT], [1],
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[Define to 1 if // is a file system root distinct from /.])
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m4/double-slash-root.m4
