re PR lto/45089 (-Os -g -fwhopr dwarf2out ICE)

2010-11-18  Richard Guenther  <rguenther@suse.de>

	PR lto/45089
	* dwarf2out.c (add_AT_die_ref): Work around LTO losing types
	when checking is not enabled.

From-SVN: r166904

gcc/ChangeLog

 2010-11-18  Richard Guenther  <rguenther@suse.de>
 
+	PR lto/45089
+	* dwarf2out.c (add_AT_die_ref): Work around LTO losing types
+	when checking is not enabled.
+
+2010-11-18  Richard Guenther  <rguenther@suse.de>
+
 	PR lto/46525
 	* gimple.c (gimple_register_type): Update TYPE_MAIN_VARIANT of
 	type leaders.

gcc/dwarf2out.c

@@ -7362,6 +7362,15 @@ add_AT_die_ref (dw_die_ref die, enum dwarf_attribute attr_kind, dw_die_ref targ_
 {
   dw_attr_node attr;
 
+#ifdef ENABLE_CHECKING
+  gcc_assert (targ_die != NULL);
+#else
+  /* With LTO we can end up trying to reference something we didn't create
+     a DIE for.  Avoid crashing later on a NULL referenced DIE.  */
+  if (targ_die == NULL)
+    return;
+#endif
+
   attr.dw_attr = attr_kind;
   attr.dw_attr_val.val_class = dw_val_class_die_ref;
   attr.dw_attr_val.v.val_die_ref.die = targ_die;