Check in gcc sources for prebuilt toolchains in Eclair.

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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                      S Y S T E M . A R I T H _ 6 4                       --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--          Copyright (C) 1992-2005, 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 2,  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.  See the GNU General Public License --
+-- for  more details.  You should have  received  a copy of the GNU General --
+-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
+-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
+-- Boston, MA 02110-1301, USA.                                              --
+--                                                                          --
+-- As a special exception,  if other files  instantiate  generics from this --
+-- unit, or you link  this unit with other files  to produce an executable, --
+-- this  unit  does not  by itself cause  the resulting  executable  to  be --
+-- covered  by the  GNU  General  Public  License.  This exception does not --
+-- however invalidate  any other reasons why  the executable file  might be --
+-- covered by the  GNU Public License.                                      --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This unit provides software routines for doing arithmetic on 64-bit
+--  signed integer values in cases where either overflow checking is
+--  required, or intermediate results are longer than 64 bits.
+
+with Interfaces;
+
+package System.Arith_64 is
+   pragma Pure;
+
+   subtype Int64 is Interfaces.Integer_64;
+
+   function Add_With_Ovflo_Check (X, Y : Int64) return Int64;
+   --  Raises Constraint_Error if sum of operands overflows 64 bits,
+   --  otherwise returns the 64-bit signed integer sum.
+
+   function Subtract_With_Ovflo_Check (X, Y : Int64) return Int64;
+   --  Raises Constraint_Error if difference of operands overflows 64
+   --  bits, otherwise returns the 64-bit signed integer difference.
+
+   function Multiply_With_Ovflo_Check (X, Y : Int64) return Int64;
+   --  Raises Constraint_Error if product of operands overflows 64
+   --  bits, otherwise returns the 64-bit signed integer product.
+
+   procedure Scaled_Divide
+     (X, Y, Z : Int64;
+      Q, R    : out Int64;
+      Round   : Boolean);
+   --  Performs the division of (X * Y) / Z, storing the quotient in Q
+   --  and the remainder in R. Constraint_Error is raised if Z is zero,
+   --  or if the quotient does not fit in 64-bits. Round indicates if
+   --  the result should be rounded. If Round is False, then Q, R are
+   --  the normal quotient and remainder from a truncating division.
+   --  If Round is True, then Q is the rounded quotient. the remainder
+   --  R is not affected by the setting of the Round flag.
+
+   procedure Double_Divide
+     (X, Y, Z : Int64;
+      Q, R    : out Int64;
+      Round   : Boolean);
+   --  Performs the division X / (Y * Z), storing the quotient in Q and
+   --  the remainder in R. Constraint_Error is raised if Y or Z is zero,
+   --  or if the quotient does not fit in 64-bits. Round indicates if the
+   --  result should be rounded. If Round is False, then Q, R are the normal
+   --  quotient and remainder from a truncating division. If Round is True,
+   --  then Q is the rounded quotient. The remainder R is not affected by the
+   --  setting of the Round flag.
+
+end System.Arith_64;