autoreconf 2.53 does not handle three levels of configure.ac

[ezra peisach]

autoreconf scans configure.ac files for AC_CONFIG_SUBDIRS and adds the
directory to the list of directories to recusively run autoreconf
in. Unforuntaley, when the subdir is decended into and
AC_CONFIG_SUBDIRS is discovered, the current directory is not
prepended onto the subdir name - resultsing in failure. Therefore
something like:

|-configure.ac
|-foo
    |configure.ac
    |bar
       |configure.ac

results in autoreconf trying to run autoconf in ".", "foo" and "bar"
instead of "foo/bar"

The following patch solves the problem and should work under windows as well.

Index: autoreconf.in
===================================================================
RCS file: /cvsroot/autoconf/autoconf/bin/autoreconf.in,v
retrieving revision 1.91
diff -c -r1.91 autoreconf.in
*** autoreconf.in       3 Apr 2002 10:53:56 -0000       1.91
--- autoreconf.in       4 Apr 2002 17:44:00 -0000
***************
*** 312,317 ****
--- 312,319 ----
    my $uses_libtool;
    my $uses_autoheader;
    my @subdir;
+   my $on_win = ($^O =~ /mswin/i);
+   my $path_sep = $on_win ? '\\' : '/';
    my $traces = new Autom4te::XFile
      ("$autoconf"
       . join (' --trace=', '',
***************
*** 338,344 ****
        if (-d)
        {
          verbose "$configure_ac: subdirectory $_ to autoreconf";
!         push @ARGV, $_;
        }
        else
        {
--- 340,346 ----
        if (-d)
        {
          verbose "$configure_ac: subdirectory $_ to autoreconf";
!         push @ARGV, $directory . $path_sep  . $_;
        }
        else
        {