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NNTP-Posting-Date: Fri, 14 Oct 2005 18:29:06 -0500
From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: changing alignment of built-in boolean
References: <1129320236.007525.185300@g44g2000cwa.googlegroups.com>
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Date: Fri, 14 Oct 2005 18:29:06 -0500
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Date: 2005-10-14T18:29:06-05:00
List-Id: <comp.lang.ada>

> 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.
    So it's not really the case that *every* Boolean needs this, just the
ones in the data structures you share with that other package.  If you are
sharing records, it would be safer to *always* use a representation clause
on the shared records to make sure alignments, sizes, packing, and
ordering all match.  If you are passing simple Boolean variables or
expressions as subroutine parameters, the Convention on your pragma
Imports ought to do the right thing.