Index: bison/src/bison/2.4.1/bison-2.4.1-src/m4/double-slash-root.m4 |
=================================================================== |
--- bison/src/bison/2.4.1/bison-2.4.1-src/m4/double-slash-root.m4 (revision 0) |
+++ bison/src/bison/2.4.1/bison-2.4.1-src/m4/double-slash-root.m4 (revision 0) |
@@ -0,0 +1,38 @@ |
+# double-slash-root.m4 serial 3 -*- Autoconf -*- |
+dnl Copyright (C) 2006, 2008 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 $host in |
+ *-cygwin | i370-ibm-openedition) |
+ gl_cv_double_slash_root=yes ;; |
+ *) |
+ # Be optimistic and assume that / and // are the same when we |
+ # don't know. |
+ gl_cv_double_slash_root='unknown, assuming no' ;; |
+ esac |
+ else |
+ set x `ls -di / // 2>/dev/null` |
+ if test "$[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 |
+]) |