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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: [GNAT] compiler options ignored for sources from ADA_INCLUDE_PATH
Date: Mon, 26 Aug 2013 08:37:41 +0100
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Date: 2013-08-26T08:37:41+01:00
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gautier_niouzes@hotmail.com writes:

> Le lundi 26 août 2013 03:22:14 UTC+2, Stephen Leake a écrit :
>
> [...]
> Thanks for the explanations.
>
>> If you want the same options (sounds like you do), create an 'options'
>> project file that just defines some variables, and use those variables
>> in the other project files.    
>
> There is a snag here. "The other project files" can be XMLAda and many others.
> XMLAda only depends on several project files:
> xmlada.gpr
> xmlada_dom.gpr
> xmlada_input.gpr
> xmlada_sax.gpr
> xmlada_schema.gpr
> xmlada_shared.gpr
> xmlada_unicode.gpr
> So I would need to to special versions of dozens of project files
> (xmlada2.gpr, ...) for having a reference to options.gpr ?
> Then have installation instructions for the users of my project
> regarding where to place those special project files ?
> Do changes in xmlada2.gpr etc. each time xmlada.gpr etc. are changing ?
> I seems a bit complicated (to be polite)...
> It's very fine when all projects are yours, but if you use many
> external projects, it is not practical.
> Thanks anyway for the explanations. I think I'll stick to
> ADA_INCLUDE_PATH and a main project and have a script to precompile
> those library items.

What are these special compiler options that mean you have to go to all
this trouble? ...

Anyway, if you're using a recent GNAT, consider external_as_list[1] in
your own project file:

   for Source_Dirs use (".") & external_as_list("ADA_SOURCE_PATH", ":");

(NB, *not* ADA_INCLUDE_PATH!)

The ":" would need to be ";" on Windows; I believe there's a trick using
a Windows-only environment variable that lets you determine this in the
project file.

[1] http://docs.adacore.com/gprbuild-docs/html/gprbuild_ug.html#External-Values