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From: Simon Wright <simon.j.wright@mac.com>
Newsgroups: comp.lang.ada
Subject: Behaviour of Version attribute
Date: Sat, 17 Feb 2007 17:16:21 +0000
Organization: Pushface
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Date: 2007-02-17T17:16:21+00:00
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I've been exploring the Version attribute and finding some behaviour I
didn't expect with GNAT (GPL 2006 and earlier versions).

It seems that GNAT only considers top-level library packages.

Given

   package Version is end Version;
   procedure Version.Impl;
   with Ada.Text_IO; use Ada.Text_IO;
   procedure Version.Impl is
   begin
      Put_Line (Ada'Version);
      Put_Line (Ada'Body_Version);
      Put_Line (Ada.Text_IO'Version);
      Put_Line (Ada.Text_IO'Body_Version);
      Put_Line (Version'Version);
      Put_Line (Version'Body_Version);
      Put_Line (Version.Impl'Version);
      Put_Line (Version.Impl'Body_Version);
   end Version.Impl;

I was surprised to get this output:

   $ ./version-impl 
   9c7dd3ea
   9c7dd3ea
   9c7dd3ea
   9c7dd3ea
   371fdad7
   371fdad7
   371fdad7
   371fdad7

This must make it hard for GLADE to validate consistency?

I'm actually using Ada95 here, but Annex E doesn't seem different as
far as this issue is concerned.