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Newsgroups: comp.lang.ada
Subject: Re: Pragma for conditional compilation? (Ada 2005 vs. 95)
References: <1190879769.361848.188220@22g2000hsm.googlegroups.com>
From: Stephen Leake <stephen_leake@stephe-leake.org>
Date: Thu, 27 Sep 2007 05:52:14 -0400
Message-ID: <uejgkmo4x.fsf@stephe-leake.org>
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Date: 2007-09-27T05:52:14-04:00
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Jerry <lanceboyle@qwest.net> writes:

> Is there a pragma to designate some lines of Ada for conditional
> compilation depending on if the compiler is Ada 2005 or not?
>
> I have made some bindings that use some of the declarations from Annex
> G.3 which relates to vector-matrix stuff which is new to Ada 2005. If
> the compiler provides those declarations (i.e., is 2005), I want to
> use the compiler's version because I figure that is the cleanest way
> to get things done. If the compiler is Ada 95, I instead want to
> provide the declarations myself.
>
> Currently, I handle this by commenting out the declarations of my own
> if Ada 2005 and uncomment them if Ada 95. (There are a couple of
> "with" and "use" lines that also have to be (un)commented but it is a
> similar situation.)
>
> I'm guessing this is an Ada "no-no" but would be interested to know
> for sure.

There is no standard pragma that does this.

GNAT provides the gnatprep tool, which is a preprocessor, that could
do this.

A more portable way is to have to different source files, and use the
build tools to select the proper one. GNAT project files can do that.

-- 
-- Stephe