$OpenBSD: patch-gcc_tree-dump_c,v 1.5 2009/04/16 18:36:48 espie Exp $
--- gcc/tree-dump.c.orig	Sat Sep  1 17:28:30 2007
+++ gcc/tree-dump.c	Tue Apr  7 19:38:59 2009
@@ -866,7 +866,7 @@ get_dump_file_name (enum tree_dump_index phase)
 	dump_id[0] = '\0';
     }
 
-  return concat (dump_base_name, dump_id, dfi->suffix, NULL);
+  return concat (dump_base_name, dump_id, dfi->suffix, (void *)0);
 }
 
 /* Begin a tree dump for PHASE. Stores any user supplied flag in
