--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/s-aotase.adb	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,66 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUN-TIME COMPONENTS                         --
+--                                                                          --
+--                  System.Atomic_Operations.Test_And_Set                   --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--                 Copyright (C) 2019, Free Software Foundation, Inc.       --
+--                                                                          --
+-- GNAT is free software;  you can  redistribute it  and/or modify it under --
+-- terms of the  GNU General Public License as published  by the Free Soft- --
+-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
+-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
+--                                                                          --
+-- As a special exception 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/>.                                          --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+with System.Atomic_Primitives; use System.Atomic_Primitives;
+
+package body System.Atomic_Operations.Test_And_Set is
+
+   -------------------------
+   -- Atomic_Test_And_Set --
+   -------------------------
+
+   function Atomic_Test_And_Set
+     (Item : aliased in out Test_And_Set_Flag) return Boolean is
+   begin
+      return Boolean (Atomic_Test_And_Set (Item'Address));
+   end Atomic_Test_And_Set;
+
+   ------------------
+   -- Atomic_Clear --
+   ------------------
+
+   procedure Atomic_Clear
+     (Item : aliased in out Test_And_Set_Flag) is
+   begin
+      Atomic_Clear (Item'Address);
+   end Atomic_Clear;
+
+   ------------------
+   -- Is_Lock_Free --
+   ------------------
+
+   function Is_Lock_Free (Item : aliased Test_And_Set_Flag) return Boolean is
+      pragma Unreferenced (Item);
+   begin
+      return True;
+   end Is_Lock_Free;
+
+end System.Atomic_Operations.Test_And_Set;