# 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 ])