gcc/ada/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) 2002-2005,2008 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 2,  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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This package provides a routine for obtaining the version number of the
  35 --  GNAT compiler used to compile the program. It relies on the generated
  36 --  constant in the binder generated package that records this information.
  37
  38 package body GNAT.Compiler_Version is
  39
  40    Ver_Len_Max : constant := 64;
  41    --  This is logically a reference to Gnatvsn.Ver_Len_Max but we cannot
  42    --  import this directly since run-time units cannot WITH compiler units.
  43
  44    Ver_Prefix : constant String := "GNAT Version: ";
  45    --  Prefix generated by binder
  46
  47    GNAT_Version : constant String (1 .. Ver_Len_Max + Ver_Prefix'Length);
  48    pragma Import (C, GNAT_Version, "__gnat_version");
  49
  50    -------------
  51    -- Version --
  52    -------------
  53
  54    function Version return String is
  55    begin
  56       --  Search for terminating right paren or NUL ending the string
  57
  58       for J in Ver_Prefix'Length + 1 .. GNAT_Version'Last loop
  59          if GNAT_Version (J) = ')' then
  60             return GNAT_Version (Ver_Prefix'Length + 1 .. J);
  61          end if;
  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;