obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
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if you have obtained the source via the command 'git clone',
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1 files changed, 113 insertions, 0 deletions

diff --git a/gcc/ada/g-crc32.ads b/gcc/ada/g-crc32.ads
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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT LIBRARY COMPONENTS                          --
+--                                                                          --
+--                           G N A T . C R C 3 2                            --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--                     Copyright (C) 2004-2005, AdaCore                     --
+--                                                                          --
+-- 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 package provides routines for computing a commonly used checksum
+--  called CRC-32. This is a checksum based on treating the binary data
+--  as a polynomial over a binary field, and the exact specifications of
+--  the CRC-32 algorithm are as follows:
+
+--     Name   : "CRC-32"
+--     Width  : 32
+--     Poly   : 04C11DB7
+--     Init   : FFFFFFFF
+--     RefIn  : True
+--     RefOut : True
+--     XorOut : FFFFFFFF
+--     Check  : CBF43926
+
+--  Note that this is the algorithm used by PKZip, Ethernet and FDDI
+
+--  For more information about this algorithm see:
+
+--    ftp://ftp.rocksoft.com/papers/crc_v3.txt
+
+--  "A Painless Guide to CRC Error Detection Algorithms", Ross N. Williams
+
+--  "Computation of Cyclic Redundancy Checks via Table Look-Up", Communications
+--  of the ACM, Vol. 31 No. 8, pp.1008-1013 Aug. 1988. Sarwate, D.V.
+
+with Ada.Streams;
+with Interfaces;
+with System.CRC32;
+
+package GNAT.CRC32 is
+
+   subtype CRC32 is System.CRC32.CRC32;
+   --  Used to represent CRC32 values, which are 32 bit bit-strings
+
+   procedure Initialize (C : out CRC32)
+     renames System.CRC32.Initialize;
+   --  Initialize CRC value by assigning the standard Init value (16#FFFF_FFFF)
+
+   procedure Update
+     (C     : in out CRC32;
+      Value : Character)
+     renames System.CRC32.Update;
+   --  Evolve CRC by including the contribution from Character'Pos (Value)
+
+   procedure Update
+     (C     : in out CRC32;
+      Value : String);
+   --  For each character in the Value string call above routine
+
+   procedure Wide_Update
+     (C     : in out CRC32;
+      Value : Wide_Character);
+   --  Evolve CRC by including the contribution from Wide_Character'Pos (Value)
+   --  with the bytes being included in the natural memory order.
+
+   procedure Wide_Update
+     (C     : in out CRC32;
+      Value : Wide_String);
+   --  For each character in the Value string call above routine
+
+   procedure Update
+     (C     : in out CRC32;
+      Value : Ada.Streams.Stream_Element);
+   --  Evolve CRC by including the contribution from Value
+
+   procedure Update
+     (C     : in out CRC32;
+      Value : Ada.Streams.Stream_Element_Array);
+   --  For each element in the Value array call above routine
+
+   function Get_Value (C : CRC32) return Interfaces.Unsigned_32
+     renames System.CRC32.Get_Value;
+   --  Get_Value computes the CRC32 value by performing an XOR with the
+   --  standard XorOut value (16#FFFF_FFFF). Note that this does not
+   --  change the value of C, so it may be used to retrieve intermediate
+   --  values of the CRC32 value during a sequence of Update calls.
+
+   pragma Inline (Update);
+   pragma Inline (Wide_Update);
+end GNAT.CRC32;