Properly handle __cxa_pure_virtual visibility (PR lto/79760).

2017-03-03  Jan Hubicka  <jh@suse.cz>

	PR lto/79760
	* ipa-devirt.c (maybe_record_node): Properly handle
	__cxa_pure_virtual visibility.

From-SVN: r245870

gcc/ChangeLog

+2017-03-03  Jan Hubicka  <jh@suse.cz>
+
+	PR lto/79760
+	* ipa-devirt.c (maybe_record_node): Properly handle
+	__cxa_pure_virtual visibility.
+
 2017-03-03  Martin Liska  <mliska@suse.cz>
 
 	PR tree-optimization/79803

gcc/ipa-devirt.c

@@ -2462,10 +2462,19 @@ maybe_record_node (vec <cgraph_node *> &nodes,
 	  nodes.safe_push (target_node);
 	}
     }
-  else if (completep
-	   && (!type_in_anonymous_namespace_p
-		 (DECL_CONTEXT (target))
-	       || flag_ltrans))
+  else if (!completep)
+    ;
+  /* We have definition of __cxa_pure_virtual that is not accessible (it is
+     optimized out or partitioned to other unit) so we can not add it.  When
+     not sanitizing, there is nothing to do.
+     Otherwise declare the list incomplete.  */
+  else if (pure_virtual)
+    {
+      if (flag_sanitize & SANITIZE_UNREACHABLE)
+	*completep = false;
+    }
+  else if (flag_ltrans
+	   || !type_in_anonymous_namespace_p (DECL_CONTEXT (target)))
     *completep = false;
 }