re PR lto/65380 ([ICF] LTO: ICE in add_symbol_to_partition_1, at lto/lto-partition.c:158)

Fix PR ipa/65380.

	PR ipa/65380
	* ipa-icf.c (sem_function::merge): Do not merge DECL_EXTERNAL symbols.
	(sem_variable::merge): Likewise.

From-SVN: r221519

gcc/ChangeLog

+2015-03-19  Jan Hubicka  <hubicka@ucw.cz>
+
+	PR ipa/65380
+	* ipa-icf.c (sem_function::merge): Do not merge DECL_EXTERNAL symbols.
+	(sem_variable::merge): Likewise.
+
 2015-03-19  Martin Liska  <mliska@suse.cz>
 
 	PR ipa/65465

gcc/ipa-icf.c

@@ -814,6 +814,13 @@ sem_function::merge (sem_item *alias_item)
   bool original_address_matters = original->address_matters_p ();
   bool alias_address_matters = alias->address_matters_p ();
 
+  if (DECL_EXTERNAL (alias->decl))
+    {
+      if (dump_file)
+	fprintf (dump_file, "Not unifying; alias is external.\n\n");
+      return false;
+    }
+
   if (DECL_NO_INLINE_WARNING_P (original->decl)
       != DECL_NO_INLINE_WARNING_P (alias->decl))
     {
@@ -1776,6 +1783,13 @@ sem_variable::merge (sem_item *alias_item)
       return false;
     }
 
+  if (DECL_EXTERNAL (alias_item->decl))
+    {
+      if (dump_file)
+	fprintf (dump_file, "Not unifying; alias is external.\n\n");
+      return false;
+    }
+
   sem_variable *alias_var = static_cast<sem_variable *> (alias_item);
 
   varpool_node *original = get_node ();