re PR lto/61886 (LTO breaks fread with _FORTIFY_SOURCE=2)

	PR ipa/61886
	* lto-cgraph.c (compute_ltrans_boundary): Add transparent alias targets
	into the boundary.

From-SVN: r231430

gcc/ChangeLog

 2015-12-08  Jan Hubicka  <hubicka@ucw.cz>
 
 	PR ipa/61886
+	* lto-cgraph.c (compute_ltrans_boundary): Add transparent alias targets
+	into the boundary.
+
+2015-12-08  Jan Hubicka  <hubicka@ucw.cz>
+
+	PR ipa/61886
 	* varpool.c (varpool_node::get_availability): Recurse only on
 	weakrefs with definition in the target.
 	(symbol_table::remove_unreferenced_decls): Keep aliases in the boundary.

gcc/lto-cgraph.c

@@ -972,6 +972,15 @@ compute_ltrans_boundary (lto_symtab_encoder_t in_encoder)
       if (cnode
 	  && cnode->thunk.thunk_p)
 	add_node_to (encoder, cnode->callees->callee, false);
+      while (node->transparent_alias && node->analyzed)
+	{
+	  node = node->get_alias_target ();
+	  if (is_a <cgraph_node *> (node))
+	    add_node_to (encoder, dyn_cast <cgraph_node *> (node),
+			 false);
+	  else
+	    lto_symtab_encoder_encode (encoder, node);
+	}
     }
   lto_symtab_encoder_delete (in_encoder);
   return encoder;