Check in gcc sources for prebuilt toolchains in Eclair.

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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUN-TIME COMPONENTS                         --
+--                                                                          --
+--             G N A T . T R A C E B A C K . S Y M B O L I C                --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--                     Copyright (C) 1999-2006, 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. --
+-- Extensive contributions were provided by Ada Core Technologies Inc.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  Run-time symbolic traceback support
+
+--  Note: this is only available on selected targets. Current targets are:
+--  Sparc/Solaris, GNU/Linux, SGI/IRIX, Windows NT, HP-UX, VMS, Tru64.
+
+--  The routines provided in this package assume that your application has
+--  been compiled with debugging information turned on, since this information
+--  is used to build a symbolic traceback.
+
+--  If you want to retrieve tracebacks from exception occurrences, it is also
+--  necessary to invoke the binder with -E switch. Please refer to the gnatbind
+--  documentation for more information.
+
+--  Note that it is also possible (and often recommended) to compute symbolic
+--  traceback outside the program execution, which in addition allows you
+--  to distribute the executable with no debug info:
+--
+--  - build your executable with debug info
+--  - archive this executable
+--  - strip a copy of the executable and distribute/deploy this version
+--  - at run time, compute absolute traceback (-bargs -E) from your
+--    executable and log it using Ada.Exceptions.Exception_Occurrence
+--  - off line, compute the symbolic traceback using the executable archived
+--    with debug info and addr2line or gdb (using info line *<addr>) on the
+--    absolute addresses logged by your application.
+
+--  In order to retrieve symbolic information, functions in this package will
+--  read on disk all the debug information of the executable file (found via
+--  Argument (0), so any path information needed to read the executable file
+--  need to be provided when launching the executable), and load then in
+--  memory, causing a significant cpu and memory overhead.
+
+--  On all platforms except VMS, this package is not intended to be used
+--  within a shared library, symbolic tracebacks are only supported for the
+--  main executable and not for shared libraries. You should consider using
+--  gdb to obtain symbolic traceback in such cases.
+
+--  On VMS, there is no restriction on using this facility with shared
+--  libraries. However, the OS should be at least v7.3-1 and OS patch
+--  VMS731_TRACE-V0100 must be applied in order to use this package.
+
+with Ada.Exceptions; use Ada.Exceptions;
+
+package GNAT.Traceback.Symbolic is
+   pragma Elaborate_Body;
+
+   ------------------------
+   -- Symbolic_Traceback --
+   ------------------------
+
+   function Symbolic_Traceback (Traceback : Tracebacks_Array) return String;
+   --  Build a string containing a symbolic traceback of the given call chain
+
+   function Symbolic_Traceback (E : Exception_Occurrence) return String;
+   --  Build string containing symbolic traceback of given exception occurrence
+
+end GNAT.Traceback.Symbolic;