Index: gcc/lto-streamer-in.c
===================================================================
--- gcc/lto-streamer-in.c	(revision 164368)
+++ gcc/lto-streamer-in.c	(working copy)
@@ -2241,7 +2271,7 @@ lto_input_ts_translation_unit_decl_tree_
 						  struct data_in *data_in,
 						  tree expr)
 {
-  TRANSLATION_UNIT_LANGUAGE (expr) = input_string (data_in, ib);
+  TRANSLATION_UNIT_LANGUAGE (expr) = xstrdup (input_string (data_in, ib));
   VEC_safe_push (tree, gc, all_translation_units, expr);
 }