--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libobjc/linking.m	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,36 @@
+/* Force linking of classes required by Objective C runtime.
+   Copyright (C) 1997-2017 Free Software Foundation, Inc.
+   Contributed by Ovidiu Predescu (ovidiu@net-community.com).
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#include "objc-private/common.h"
+#include <objc/Object.h>
+
+/* Generate references to Object class since it is needed by the
+   runtime system to run correctly.  */
+
+void __objc_linking (void)
+{
+  [Object class];
+}
+