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From: Georg Bauhaus <sb463ba@l1-hrz.uni-duisburg.de>
Newsgroups: comp.lang.ada
Subject: Re: Standard Ada Preprocessor
Date: Thu, 22 Jan 2004 19:02:29 +0000 (UTC)
Organization: GMUGHDU
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Warren W. Gay VE3WWG <warren@ve3wwg.tk> wrote:
: MDC pointed out that you cannot conditionally do "with"
: as one example.

Withing or not cannot be an option unless another possibly
related conditional requires a unit or not.
If there is no other conditional text, renaming an empty
package will do.

: Implementation defined pragmas are
: another area of difficulty. Optional features are
: a pain to deal with since there is no way to feed
: values into a compile process (using make),
: without creating make "steps" that process the
: source code before hand (ie. this becomes a manual
: preprocessing step).

So what is the greater pain?
To me, placing conditionals near the conditional sections is
tempting, but usually leads to #ifs all over the place.  It is
like writing tasking constructs without language support, or
like wrting your own dispatcher.  If we had a way to declare for
any of the 2**N compilations which conditions are to be met, and
which parts of the program text have to be in place for one of the
compilations, configuration could be done in a systematic manner,
with the help of a computer program that does configuration checking,
and with a readable statement (declarative in style) of the programs
dependences.


-- Georg