--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnarl/a-exetim.ads	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,119 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUN-TIME COMPONENTS                         --
+--                                                                          --
+--                   A D A . E X E C U T I O N _ T I M E                    --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+-- This specification is derived from the Ada Reference Manual for use with --
+-- GNAT.  In accordance with the copyright of that document, you can freely --
+-- copy and modify this specification,  provided that if you redistribute a --
+-- modified version,  any changes that you have made are clearly indicated. --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This unit is not implemented in typical GNAT implementations that lie on
+--  top of operating systems, because it is infeasible to implement in such
+--  environments.
+
+--  If a target environment provides appropriate support for this package
+--  then the Unimplemented_Unit pragma should be removed from this spec and
+--  an appropriate body provided.
+
+with Ada.Task_Identification;
+with Ada.Real_Time;
+
+package Ada.Execution_Time with
+  SPARK_Mode
+is
+   pragma Preelaborate;
+
+   pragma Unimplemented_Unit;
+
+   type CPU_Time is private;
+
+   CPU_Time_First : constant CPU_Time;
+   CPU_Time_Last  : constant CPU_Time;
+   CPU_Time_Unit  : constant := 0.000001;
+   CPU_Tick       : constant Ada.Real_Time.Time_Span;
+
+   use type Ada.Task_Identification.Task_Id;
+
+   function Clock
+     (T : Ada.Task_Identification.Task_Id :=
+        Ada.Task_Identification.Current_Task)
+      return CPU_Time
+   with
+     Volatile_Function,
+     Global => Ada.Real_Time.Clock_Time,
+     Pre    => T /= Ada.Task_Identification.Null_Task_Id;
+
+   function "+"
+     (Left  : CPU_Time;
+      Right : Ada.Real_Time.Time_Span) return CPU_Time
+   with
+     Global => null;
+
+   function "+"
+     (Left  : Ada.Real_Time.Time_Span;
+      Right : CPU_Time) return CPU_Time
+   with
+     Global => null;
+
+   function "-"
+     (Left  : CPU_Time;
+      Right : Ada.Real_Time.Time_Span) return CPU_Time
+   with
+     Global => null;
+
+   function "-"
+     (Left  : CPU_Time;
+      Right : CPU_Time) return Ada.Real_Time.Time_Span
+   with
+     Global => null;
+
+   function "<"  (Left, Right : CPU_Time) return Boolean with
+     Global => null;
+   function "<=" (Left, Right : CPU_Time) return Boolean with
+     Global => null;
+   function ">"  (Left, Right : CPU_Time) return Boolean with
+     Global => null;
+   function ">=" (Left, Right : CPU_Time) return Boolean with
+     Global => null;
+
+   procedure Split
+     (T  : CPU_Time;
+      SC : out Ada.Real_Time.Seconds_Count;
+      TS : out Ada.Real_Time.Time_Span)
+   with
+     Global => null;
+
+   function Time_Of
+     (SC : Ada.Real_Time.Seconds_Count;
+      TS : Ada.Real_Time.Time_Span := Ada.Real_Time.Time_Span_Zero)
+      return CPU_Time
+   with
+     Global => null;
+
+   Interrupt_Clocks_Supported          : constant Boolean := False;
+   Separate_Interrupt_Clocks_Supported : constant Boolean := False;
+
+   pragma Warnings (Off, "check will fail at run time");
+   function Clock_For_Interrupts return CPU_Time with
+     Volatile_Function,
+     Global => Ada.Real_Time.Clock_Time,
+     Pre    => Interrupt_Clocks_Supported;
+   pragma Warnings (On, "check will fail at run time");
+
+private
+   pragma SPARK_Mode (Off);
+
+   type CPU_Time is new Ada.Real_Time.Time;
+
+   CPU_Time_First : constant CPU_Time  := CPU_Time (Ada.Real_Time.Time_First);
+   CPU_Time_Last  : constant CPU_Time  := CPU_Time (Ada.Real_Time.Time_Last);
+
+   CPU_Tick : constant Ada.Real_Time.Time_Span := Ada.Real_Time.Tick;
+
+end Ada.Execution_Time;