re PR lto/65316 (LTO: Uninitialized memory / ICE with -g…

re PR lto/65316 (LTO: Uninitialized memory / ICE with -g -fno-lto-odr-type-merging: in types_same_for_odr, at ipa-devirt.c:465)


	PR ipa/65316
	* tree.c (free_lang_data_in_type): Be sure to keep BINFO_VTABLE
	when outputting debug.

From-SVN: r221258

gcc/ChangeLog

+2015-03-05  Jan Hubicka  <hubicka@ucw.cz>
+
+	PR ipa/65316
+	* tree.c (free_lang_data_in_type): Be sure to keep BINFO_VTABLE
+	when outputting debug.
+
 2015-03-07  Marek Polacek  <polacek@redhat.com>
 	    Martin Uecker  <uecker@eecs.berkeley.edu>
 

gcc/tree.c

@@ -5081,9 +5081,15 @@ free_lang_data_in_type (tree type)
       if (TYPE_BINFO (type))
 	{
 	  free_lang_data_in_binfo (TYPE_BINFO (type));
+	  /* We need to preserve link to bases and virtual table for all
+	     polymorphic types to make devirtualization machinery working.
+	     Debug output cares only about bases, but output also
+	     virtual table pointers so merging of -fdevirtualize and
+	     -fno-devirtualize units is easier.  */
 	  if ((!BINFO_VTABLE (TYPE_BINFO (type))
 	       || !flag_devirtualize)
-	      && (!BINFO_N_BASE_BINFOS (TYPE_BINFO (type))
+	      && ((!BINFO_N_BASE_BINFOS (TYPE_BINFO (type))
+		   && !BINFO_VTABLE (TYPE_BINFO (type)))
 		  || debug_info_level != DINFO_LEVEL_NONE))
 	    TYPE_BINFO (type) = NULL;
 	}