$OpenBSD: patch-gcc_coverage_c,v 1.1.1.1 2009/06/22 22:37:32 sthen Exp $
--- gcc/coverage.c.orig	Mon Nov  3 07:33:15 2008
+++ gcc/coverage.c	Mon Jun 22 00:53:58 2009
@@ -810,7 +810,7 @@ build_gcov_info (void)
   fields = field;
   filename = getpwd ();
   filename = (filename && da_file_name[0] != '/'
-	      ? concat (filename, "/", da_file_name, NULL)
+	      ? concat (filename, "/", da_file_name, (void *)0)
 	      : da_file_name);
   filename_len = strlen (filename);
   filename_string = build_string (filename_len + 1, filename);