Verify that target can create a dispatcher call (PR target/79892).

2017-03-14  Martin Liska  <mliska@suse.cz>

	PR target/79892
	* multiple_target.c (create_dispatcher_calls): Check that
	a target can create a function dispatcher.

From-SVN: r246120

gcc/ChangeLog

 2017-03-14  Martin Liska  <mliska@suse.cz>
 
+	PR target/79892
+	* multiple_target.c (create_dispatcher_calls): Check that
+	a target can create a function dispatcher.
+
+2017-03-14  Martin Liska  <mliska@suse.cz>
+
 	PR lto/66295
 	* multiple_target.c (expand_target_clones): Drop local.local
 	flag for default implementation.

gcc/multiple_target.c

@@ -68,6 +68,13 @@ create_dispatcher_calls (struct cgraph_node *node)
 		    " supported by this target");
 	  break;
 	}
+      else if (!targetm.get_function_versions_dispatcher)
+	{
+	  error_at (gimple_location (call),
+		    "target does not support function version dispatcher");
+	  break;
+	}
+
       e_next = e->next_caller;
       idecl = targetm.get_function_versions_dispatcher (decl);
       if (!idecl)