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From: "Steve" <nospam_steved94@comcast.net>
Newsgroups: comp.lang.ada
References: <1129320236.007525.185300@g44g2000cwa.googlegroups.com>
Subject: Re: changing alignment of built-in boolean
Date: Fri, 14 Oct 2005 18:39:42 -0700
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Date: 2005-10-14T18:39:42-07:00
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<invalidemail@aerojockey.com> wrote in message 
news:1129320236.007525.185300@g44g2000cwa.googlegroups.com...
> 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.
>

GNAT appears to be happy with the following:

procedure ClaTestAlignment is
  value : Boolean;
  for value'size use 32;
  for value'alignment use 4;
begin
  null;
end ClaTestAlignment;

Also, me thinks (but cannot confirm) that the alignment value is in terms of 
storage units not bits.

Steve
(The Duck)