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
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
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1 files changed, 103 insertions, 0 deletions

diff --git a/gcc/ada/g-boubuf.ads b/gcc/ada/g-boubuf.ads
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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT LIBRARY COMPONENTS                          --
+--                                                                          --
+--                  G N A T . B O U N D E D _ B U F F E R S                 --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--                     Copyright (C) 2003-2006, 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. --
+-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This package provides a thread-safe generic bounded buffer abstraction.
+--  Instances are useful directly or as parts of the implementations of other
+--  abstractions, such as mailboxes.
+
+--  Bounded_Buffer is declared explicitly as a protected type, rather than as
+--  a simple limited private type completed as a protected type, so that
+--  clients may make calls accordingly (i.e., conditional/timed entry calls).
+
+with System;
+
+generic
+   type Element is private;
+   --  The type of the values contained within buffer objects
+
+package GNAT.Bounded_Buffers is
+   pragma Pure;
+
+   type Content is array (Positive range <>) of Element;
+   --  Content is an internal artefact that cannot be hidden because protected
+   --  types cannot contain type declarations.
+
+   Default_Ceiling : constant System.Priority := System.Default_Priority;
+   --  A convenience value for the Ceiling discriminant
+
+   protected type Bounded_Buffer
+      (Capacity : Positive;
+      --  Objects of type Bounded_Buffer specify the maximum number of Element
+      --  values they can hold via the discriminant Capacity.
+
+      Ceiling : System.Priority)
+      --  Users must specify the ceiling priority for the object. If the
+      --  Real-Time Systems Annex is not in use this value is not important.
+   is
+      pragma Priority (Ceiling);
+
+      entry Insert (Item : Element);
+      --  Insert Item into the buffer, blocks caller until space is available
+
+      entry Remove (Item : out Element);
+      --  Remove next available Element from buffer. Blocks caller until an
+      --  Element is available.
+
+      function Empty return Boolean;
+      --  Returns whether the instance contains any Elements.
+      --  Note: State may change immediately after call returns.
+
+      function Full return Boolean;
+      --  Returns whether any space remains within the instance.
+      --  Note: State may change immediately after call returns.
+
+      function Extent return Natural;
+      --  Returns the number of Element values currently held
+      --  within the instance.
+      --  Note: State may change immediately after call returns.
+
+   private
+      Values   : Content (1 .. Capacity);
+      --  The container for the values held by the buffer instance
+
+      Next_In  : Positive := 1;
+      --  The index of the next Element inserted. Wraps around
+
+      Next_Out : Positive := 1;
+      --  The index of the next Element removed. Wraps around
+
+      Count    : Natural  := 0;
+      --  The number of Elements currently held
+   end Bounded_Buffer;
+
+end GNAT.Bounded_Buffers;