From: Adam Beneschan <adam@irvine.com>
Subject: Re: Enumeration representation clause surprise.
Date: Wed, 11 Jun 2008 07:58:44 -0700 (PDT)
Date: 2008-06-11T07:58:44-07:00 [thread overview]
Message-ID: <55613982-679e-419d-8656-03b549393289@w4g2000prd.googlegroups.com> (raw)
In-Reply-To: 87abhs6qyj.fsf@willow.rfc1149.net
On Jun 11, 6:28 am, Samuel Tardieu <s...@rfc1149.net> wrote:
> Markus> This is exactly my point. I would have expected a compile time error
> Markus> for this impossible request.
>
> Markus> Representation clauses are (amongst other) meant to specify specific
> Markus> binary layouts for interfacing with the external world. Or am I
> Markus> mistaken here?
>
> I can't find anything in RM chapter 13 which either forbids or allows
> such a behaviour. I will submit a patch for GNAT which gives a new
> warning for this case:
>
> 11. A1 at 0 range 0 .. 0; -- (*)
> |
> >>> warning: component representation will be biased
This seems odd to me. Having GNAT select a biased component in
Christoph's example makes some sense, since a compiler can choose any
representation it likes. But in Markus' case, he specifically asked
for a certain representation for the enumeration types---should GNAT
take it upon itself to change that, and display a warning that doesn't
make it clear that it's disrespecting his request to have the
enumeration represented a certain way?
I dunno... maybe this would be acceptable to some, and apparently
Markus thinks it's OK, but ... it's just not what I would expect ...
I guess it's a subjective thing.
-- Adam
next prev parent reply other threads:[~2008-06-11 14:58 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-11 11:38 Enumeration representation clause surprise Markus Schoepflin
2008-06-11 12:30 ` christoph.grein
2008-06-11 12:56 ` Markus Schoepflin
2008-06-11 13:08 ` christoph.grein
2008-06-11 13:28 ` Samuel Tardieu
2008-06-11 13:48 ` Markus Schoepflin
2008-06-11 13:56 ` Samuel Tardieu
2008-06-11 14:58 ` Adam Beneschan [this message]
2008-06-11 15:23 ` Markus Schoepflin
2008-06-12 2:37 ` Randy Brukardt
2008-06-12 2:37 ` Randy Brukardt
2008-06-11 15:56 ` Samuel Tardieu
2008-06-11 19:10 ` Adam Beneschan
2008-06-11 19:59 ` Niklas Holsti
2008-06-12 1:16 ` tmoran
2008-06-12 8:27 ` christoph.grein
2008-06-12 8:45 ` Markus Schoepflin
2008-06-12 16:43 ` Mike Silva
2008-06-12 18:41 ` Markus Schöpflin
2008-06-12 20:10 ` Mike Silva
2008-06-12 20:52 ` Simon Wright
2008-06-12 23:36 ` Mike Silva
2008-06-13 5:49 ` Simon Wright
2008-06-13 7:21 ` Keith Thompson
2008-06-13 13:31 ` Mike Silva
2008-06-13 14:45 ` Markus Schoepflin
2008-06-13 17:52 ` Keith Thompson
2008-06-13 9:14 ` Jean-Pierre Rosen
2008-06-12 19:05 ` richtmyer
2008-06-12 21:26 ` Samuel Tardieu
2008-06-12 22:42 ` Adam Beneschan
2008-06-13 7:11 ` Samuel Tardieu
2008-06-13 8:27 ` christoph.grein
2008-06-13 16:21 ` Adam Beneschan
2008-06-15 19:33 ` Robert A Duff
2008-06-16 14:50 ` Adam Beneschan
2008-06-16 19:18 ` Robert A Duff
2008-06-17 6:03 ` christoph.grein
2008-06-17 7:22 ` christoph.grein
2008-06-13 8:24 ` Peter Hermann
2008-06-13 14:47 ` Samuel Tardieu
2008-06-14 11:48 ` John B. Matthews
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