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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- S Y S T E M . R A N D O M _ S E E D --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 2011-2012, 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. --
+-- --
+------------------------------------------------------------------------------
+
+-- Version used on all systems except Ravenscar where Calendar is unavailable
+
+with Ada.Calendar; use Ada.Calendar;
+with Ada.Unchecked_Conversion;
+
+package body System.Random_Seed is
+
+ Y2K : constant Time :=
+ Time_Of (Year => 2000, Month => 1, Day => 1, Seconds => 0.0);
+ -- First day of Year 2000, to get a duration
+
+ function To_U64 is
+ new Ada.Unchecked_Conversion (Duration, Interfaces.Unsigned_64);
+
+ --------------
+ -- Get_Seed --
+ --------------
+
+ function Get_Seed return Interfaces.Unsigned_64 is
+ begin
+ return To_U64 (Clock - Y2K);
+ end Get_Seed;
+
+end System.Random_Seed;