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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 15:03:17 +0000 (UTC)
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Marin David Condic <nobody@noplace.com> wrote:
: Better than Gnat, but still not terribly useful if you want to make code 
: that will compile on both a Gnat and an Aonix platform.

What kind of difficulties do you see that could be better solved
by a preprocessor? (Things supported in GNAT but not ObjectAda or vice
versa? Dependence on pragmata?)

I have code that is compiled by OA 722, by GCC 34, but not by GNAT 3.15p.
Ada source text is chopped where necessary using make.
(Operating) System specific routines are are assembled into a
package hierarchy (which I naively had top-level-named "System" (and
that triggers a bug box in GCC 34 after looping (the maintainers
say that, obviously, a library unit should not be modified...)))
Then a branch renames package Systems.Windows, another renames
package Systems.UNIX (or similarly).

The problem that leads GNAT 3.15p to reject another unit is
apparently a bug in GNAT 3.15p that has been fixed in GCC 34.
I like this better than having to construct sources around a
compiler bug/limitation using hopefully temporary preprocessor #ifs.


-- Georg