diff -r 9ee93616430f gcc/toplev.c
--- a/gcc/toplev.c	Fri Sep 03 19:11:43 2010 +0200
+++ b/gcc/toplev.c	Mon Sep 06 18:16:03 2010 +0200
@@ -1644,7 +1644,7 @@
 
   fprintf (stack_usage_file,
 	   "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC"\t%s\n",
-	   basename (loc.file),
+	   lbasename (loc.file),
 	   loc.line,
 	   loc.column,
 	   id,