From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Subject: Re: changing alignment of built-in boolean
Date: Sat, 15 Oct 2005 00:55:43 +0200
Date: 2005-10-15T00:55:43+02:00 [thread overview]
Message-ID: <8764rzhfo0.fsf@ludovic-brenta.org> (raw)
In-Reply-To: 1129320236.007525.185300@g44g2000cwa.googlegroups.com
invalidemail@aerojockey.com writes:
> Is it possible, in GNAT, to force the built-in Boolean type to use
> 4-byte (32-bit) alignment? Reason: I have to interface some Ada code
> to a package that insists on 32-bit variables on 4-byte-aligned
> addresses.
>
> Feel free to suggest some other strategy for accomplishing this, though
> I'd prefer not to make extensive changes to the Ada code (such as
> changing it to use a subtype of Boolean).
>
> I'm using GNAT 3.15p on HPUX.
>
> Thanks.
type T is record
B : Boolean;
...
end record;
for T use record
B at 0 range 0 .. 31;
...
end record;
package P is
subtype External_Boolean is Boolean;
for External_Boolean'Size use 32;
for External_Boolean'Alignment use 32;
procedure External (B : in External_Boolean);
pragma Import (C, External, "some_function");
end P;
--
Ludovic Brenta.
next prev parent reply other threads:[~2005-10-14 22:55 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-14 20:03 changing alignment of built-in boolean invalidemail
2005-10-14 22:55 ` Ludovic Brenta [this message]
2005-10-14 23:33 ` invalidemail
2005-10-15 7:13 ` Martin Krischik
2005-10-17 18:02 ` Jean-Pierre Rosen
2005-10-14 23:29 ` tmoran
2005-10-15 1:39 ` Steve
2005-10-15 6:45 ` Jeffrey R. Carter
2005-10-15 6:40 ` Jeffrey R. Carter
2005-10-16 17:48 ` invalidemail
2005-11-09 3:25 ` Anonymous Coward
2005-11-09 5:42 ` christoph.grein
2005-11-09 22:14 ` Jeffrey R. Carter
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