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From: Geert Bosch <geert@gonzo.sun3.iaf.nl>
Subject: Re: ifdef replacement for GNAT
Date: 1998/04/11
Message-ID: <6gmgmf$9di$1@gonzo.sun3.iaf.nl>#1/1
X-Deja-AN: 343048319
References: <352287EE.1CFB@tolstoy.mdc.com> <352B8208.41C6@tolstoy.mdc.com>
 <dewar.892128219@merv> <86g1jm2gcf.fsf@zappa>
Organization: La Calandre Infortunee
Newsgroups: comp.lang.ada
Date: 1998-04-11T00:00:00+00:00
List-Id: <comp.lang.ada>


Dirk Zoller <duz> wrote:
 ``How is an Ada project (GNAT) being kept portable among various Unices
   and say, Win32? Assume there is something special to be done in all
   environments. Without using a nonstandard tool like gnatprep that is.''

Very easy: put system dependent stuff in a package with a well defined
interface (spec) and use different bodies for different systems.
You'd like to make this system dependent part as small as possible,
but this is a good design principle anyway. 

When you want to add a new system you just write a new implementation
for the spec for system dependent stuff and that's it. No more hunting
#ifdefs in dozens of files and breaking other code in the process...

Regards,
   Geert