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From: "Samuel T. Harris" <sam_harris@hso.link.com>
Subject: Re: Conditional Code in Ada 95?
Date: 1998/08/27
Message-ID: <35E58D2E.FD34A7DB@hso.link.com>#1/1
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References: <35DDFB42.1311@boeing.com>
 <35DE5320.E3128663@rational.please_no_unsolicited_mail.com>
 <35E196F8.6163D721@lmco.com>
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Organization: Raytheon Training Inc.
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Newsgroups: comp.lang.ada
Date: 1998-08-27T00:00:00+00:00
List-Id: <comp.lang.ada>

Mark A Biggar wrote:
> 
> Gene Ouye wrote:
> > Rex Reges wrote:
> > > I just saw some Ada95 code riddled with conditional
> > > compilation statements. I wasn't aware that this
> > > was part of Ada95 and I can't find it in the ARM.
> > > Is this some feature that compiler vendors have
> > > all decided to support?
> > Rational Apex includes a preprocessor that can be used for conditional
> > compilation, but this is certainly NOT something that the ARM requires,
> > and Ada compiler vendors are NOT required to provide it.  As far as I
> > know, the compiler vendors have not decided to support any particular
> > conditional compilation syntax much less conditional compilation in
> > general.
> 
> It should also be noted that most ANSI standard C compiler preprocessors
> will not work with Ada code.  The 2 languages have just enough differences
> in the way they break text up into tokens that a ANSI C preprocessor (whose
> operation is defined in terms of token strings not characters) gets
> very confused, especially about ' attributes.  Older pre-ANSI text based
> C preporcessors may work depending on how they habdle quoting.
> 
> --
> Mark Biggar
> mark.a.biggar@lmco.com

I'm afraid the original message has expired in my news server,
but I seem to remember the problem involved moving from VADS
to GNAT. It should be noted that the VADS a.app works with
or without a VADS library so the original poster could continue
using a.app as before and still use GNAT for the actual
compilation.

-- 
Samuel T. Harris, Principal Engineer
Raytheon Training Incorporated
"If you can make it, We can fake it!"