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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: A proposal for Debian policy for Ada
Date: Sun, 16 May 2010 22:48:19 +0200
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"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
> In the past we are used to link external libraries using package Linker and
> Default_Switches ("ada") set to, e.g. "-lgdk_pixbuf-2.0". The problem with
> this approach is that Linker package is not automatically inherited. There
> exist different workarounds all more or less unpleasant.
>
> Meanwhile there is IMO a cleaner and simpler way. Just create a gpr file
> for the library(es) in use. For example:
>
> project Gdk_Pixbuf is
>    for Externally_Built use "true";
>    for Source_Files use ();
>    for Library_Dir use "/usr/lib"; -- Where it resides
>    for Library_Name use "gdk_pixbuf-2.0"; -- Its name (no ".so" ending)
>    for Library_Kind use "dynamic"; -- Shared in this case
> end Gdk_Pixbuf;
>
> Then with it in your project:
>
> with "gdk_pixbuf.gpr";
> project My_Library is
>    ... -- No linker package needed
> end My_Library;
>
> That is. gnatmake and gprbuild will add necessary linker options to all
> projects referencing My_Library.
>
> What about adding this as a requirement to the Debian policy?

It seems you forgot to read §5.3.6 GNAT project file and §6 Using shared
libraries.

-- 
Ludovic Brenta.