--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libatomic/flag.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,64 @@
+/* Copyright (C) 2015-2017 Free Software Foundation, Inc.
+
+   This file is part of the GNU Atomic Library (libatomic).
+
+   Libatomic 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 of the License, or
+   (at your option) any later version.
+
+   Libatomic 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 "libatomic_i.h"
+
+#include <stdatomic.h>
+
+/* Out-of-line versions of <stdatomic.h> flag functions.  */
+
+/* Atomically set *OBJECT to true, returning the previous value.  */
+
+_Bool
+(atomic_flag_test_and_set) (volatile atomic_flag *object)
+{
+  return atomic_flag_test_and_set (object);
+}
+
+/* Atomically set *OBJECT to true, returning the previous value, with
+   memory affected according to ORDER.  */
+
+_Bool
+(atomic_flag_test_and_set_explicit) (volatile atomic_flag *object,
+				     memory_order order)
+{
+  return atomic_flag_test_and_set_explicit (object, order);
+}
+
+/* Atomically set *OBJECT to false.  */
+
+void
+(atomic_flag_clear) (volatile atomic_flag *object)
+{
+  atomic_flag_clear (object);
+}
+
+/* Atomically set *OBJECT to false, with memory affected according to
+   ORDER.  */
+
+void
+(atomic_flag_clear_explicit) (volatile atomic_flag *object,
+			      memory_order order)
+{
+  return atomic_flag_clear_explicit (object, order);
+}