1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                    S Y S T E M . E X C E P T I O N S                     --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--          Copyright (C) 2006-2013, Free Software Foundation, Inc.         --
10--                                                                          --
11-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12-- terms of the  GNU General Public License as published  by the Free Soft- --
13-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
14-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
17--                                                                          --
18-- As a special exception under Section 7 of GPL version 3, you are granted --
19-- additional permissions described in the GCC Runtime Library Exception,   --
20-- version 3.1, as published by the Free Software Foundation.               --
21--                                                                          --
22-- You should have received a copy of the GNU General Public License and    --
23-- a copy of the GCC Runtime Library Exception along with this program;     --
24-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
25-- <http://www.gnu.org/licenses/>.                                          --
26--                                                                          --
27-- GNAT was originally developed  by the GNAT team at  New York University. --
28-- Extensive contributions were provided by Ada Core Technologies Inc.      --
29--                                                                          --
30------------------------------------------------------------------------------
31
32pragma Compiler_Unit_Warning;
33
34package System.Exceptions is
35
36   pragma Preelaborate_05;
37   --  To let Ada.Exceptions "with" us and let us "with" Standard_Library
38
39   ZCX_By_Default : constant Boolean;
40   --  Visible copy to allow Ada.Exceptions to know the exception model
41
42private
43
44   type Require_Body;
45   --  Dummy Taft-amendment type to make it legal (and required) to provide
46   --  a body for this package.
47   --
48   --  We do this because this unit used to have a body in earlier versions
49   --  of GNAT, and it causes various bootstrap path problems etc if we remove
50   --  a body, since we may pick up old unwanted bodies.
51   --
52   --  Note: we use this standard Ada method of requiring a body rather
53   --  than the cleaner pragma No_Body because System.Exceptions is a compiler
54   --  unit, and older bootstrap compilers do not support pragma No_Body. This
55   --  type can be removed, and s-except.adb can be replaced by a source
56   --  containing just that pragma, when we decide to move to a 2008 compiler
57   --  as the minimal bootstrap compiler version. ???
58
59   ZCX_By_Default : constant Boolean := System.ZCX_By_Default;
60
61   Foreign_Exception : exception;
62   pragma Unreferenced (Foreign_Exception);
63   --  This hidden exception is used to represent non-Ada exception to
64   --  Ada handlers. It is in fact referenced by its linking name.
65
66end System.Exceptions;
67