avoid infinite loop in h2xs (from Hugo van der Sanden)

p4raw-id: //depot/perl@5713

diff --git a/utils/h2xs.PL b/utils/h2xs.PL
index 333e891..50b15d1 100644 (file)
--- a/utils/h2xs.PL
+++ b/utils/h2xs.PL
@@ -586,7 +586,7 @@ if( ! $opt_X ){  # use XS, unless it was disabled
       }
     }
     { local $" = '|';
-      $typedef_rex = qr(\b(?<!struct )(?:@good_td)\b);
+      $typedef_rex = qr(\b(?<!struct )(?:@good_td)\b) if @good_td;
     }
     %known_fnames = map @$_[1,3], @$fdecls_parsed; # [1,3] is NAME, FULLTEXT
     if ($fmask) {