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, 124 insertions, 0 deletions

diff --git a/gcc/ada/s-taspri-mingw.ads b/gcc/ada/s-taspri-mingw.ads
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+------------------------------------------------------------------------------
+--                                                                          --
+--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
+--                                                                          --
+--                 S Y S T E M . T A S K _ P R I M I T I V E S              --
+--                                                                          --
+--                                  S p e c                                 --
+--                                                                          --
+--          Copyright (C) 1991-2009, Free Software Foundation, Inc.         --
+--                                                                          --
+-- GNARL 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/>.                                          --
+--                                                                          --
+-- GNARL was developed by the GNARL team at Florida State University.       --
+-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This is a NT (native) version of this package
+
+pragma Polling (Off);
+--  Turn off polling, we do not want ATC polling to take place during tasking
+--  operations. It causes infinite loops and other problems.
+
+with System.OS_Interface;
+with System.Win32;
+
+package System.Task_Primitives is
+   pragma Preelaborate;
+
+   type Lock is limited private;
+   --  Should be used for implementation of protected objects
+
+   type RTS_Lock is limited private;
+   --  Should be used inside the runtime system. The difference between Lock
+   --  and the RTS_Lock is that the later one serves only as a semaphore so
+   --  that do not check for ceiling violations.
+
+   type Suspension_Object is limited private;
+   --  Should be used for the implementation of Ada.Synchronous_Task_Control
+
+   type Task_Body_Access is access procedure;
+   --  Pointer to the task body's entry point (or possibly a wrapper
+   --  declared local to the GNARL).
+
+   type Private_Data is limited private;
+   --  Any information that the GNULLI needs maintained on a per-task basis.
+   --  A component of this type is guaranteed to be included in the
+   --  Ada_Task_Control_Block.
+
+   subtype Task_Address is System.Address;
+   --  In some versions of Task_Primitives, notably for VMS, Task_Address is
+   --  the short version of address defined in System.Aux_DEC. To avoid
+   --  dragging Aux_DEC into tasking packages a tasking specific subtype is
+   --  defined here.
+
+   Task_Address_Size : constant := Standard'Address_Size;
+   --  The size of Task_Address
+
+   Alternate_Stack_Size : constant := 0;
+   --  No alternate signal stack is used on this platform
+
+private
+
+   type Lock is record
+      Mutex          : aliased System.OS_Interface.CRITICAL_SECTION;
+      Priority       : Integer;
+      Owner_Priority : Integer;
+   end record;
+
+   type Condition_Variable is new System.Win32.HANDLE;
+
+   type RTS_Lock is new System.OS_Interface.CRITICAL_SECTION;
+
+   type Suspension_Object is record
+      State : Boolean;
+      pragma Atomic (State);
+      --  Boolean that indicates whether the object is open. This field is
+      --  marked Atomic to ensure that we can read its value without locking
+      --  the access to the Suspension_Object.
+
+      Waiting : Boolean;
+      --  Flag showing if there is a task already suspended on this object
+
+      L : aliased System.OS_Interface.CRITICAL_SECTION;
+      --  Protection for ensuring mutual exclusion on the Suspension_Object
+
+      CV : aliased Win32.HANDLE;
+      --  Condition variable used to queue threads until condition is signaled
+   end record;
+
+   type Private_Data is record
+      Thread : aliased Win32.HANDLE;
+      pragma Atomic (Thread);
+      --  Thread field may be updated by two different threads of control.
+      --  (See, Enter_Task and Create_Task in s-taprop.adb).
+      --  They put the same value (thr_self value). We do not want to
+      --  use lock on those operations and the only thing we have to
+      --  make sure is that they are updated in atomic fashion.
+
+      Thread_Id : aliased Win32.DWORD;
+      --  Used to provide a better tasking support in gdb
+
+      CV : aliased Condition_Variable;
+      --  Condition Variable used to implement Sleep/Wakeup
+
+      L : aliased RTS_Lock;
+      --  Protection for all components is lock L
+   end record;
+
+end System.Task_Primitives;