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