*** xsubpp.old  Fri Aug  8 13:18:20 2003
--- xsubpp      Fri Aug  8 13:13:23 2003
***************
*** 164,169 ****
--- 164,170 ----
      $process_inout = 1, next SWITCH   if $flag eq 'inout';
      $process_argtypes = 0, next SWITCH        if $flag eq 'noargtypes';
      $process_argtypes = 1, next SWITCH        if $flag eq 'argtypes';
+     $preprocess = 1, next SWITCH        if $flag eq 'preprocess';
      (print "xsubpp version $XSUBPP_version\n"), exit
        if $flag eq 'v';
      die $usage;
***************
*** 883,889 ****
      $text;
  }

! open($FH, $filename) or die "cannot open $filename: $!\n";

  # Identify the version of xsubpp used
  print <<EOM ;
--- 884,895 ----
      $text;
  }

! if ( $preprocess ) {
!   open($FH, "$Config{cpp} $filename |")
!     or die "cannot open $Config{cpp} $filename: $!\n";
! } else {
!   open($FH, $filename) or die "cannot open $filename: $!\n";
! }