File : g-comver.adb
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- G N A T . C O M P I L E R _ V E R S I O N --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 2002-2010, AdaCore --
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 -- --
19 -- --
20 -- --
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
32 -- This package provides a routine for obtaining the version number of the
33 -- GNAT compiler used to compile the program. It relies on the generated
34 -- constant in the binder generated package that records this information.
35
36 package body GNAT.Compiler_Version is
37
38 Ver_Len_Max : constant := 64;
39 -- This is logically a reference to Gnatvsn.Ver_Len_Max but we cannot
40 -- import this directly since run-time units cannot WITH compiler units.
41
42 Ver_Prefix : constant String := "GNAT Version: ";
43 -- This is logically a reference to Gnatvsn.Ver_Prefix but we cannot
44 -- import this directly since run-time units cannot WITH compiler units.
45
46 GNAT_Version : constant String (1 .. Ver_Len_Max + Ver_Prefix'Length);
47 pragma Import (C, GNAT_Version, "__gnat_version");
48
49 -------------
50 -- Version --
51 -------------
52
53 function Version return String is
54 begin
55 -- Search for terminating right paren or NUL ending the string
56
57 for J in Ver_Prefix'Length + 1 .. GNAT_Version'Last loop
58 if GNAT_Version (J) = ')' then
59 return GNAT_Version (Ver_Prefix'Length + 1 .. J);
60 end if;
61
62 if GNAT_Version (J) = Character'Val (0) then
63 return GNAT_Version (Ver_Prefix'Length + 1 .. J - 1);
64 end if;
65 end loop;
66
67 -- This should not happen (no right paren or NUL found)
68
69 return GNAT_Version;
70 end Version;
71
72 end GNAT.Compiler_Version;