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From: Victor Porton <porton@narod.ru>
Newsgroups: comp.lang.ada
Subject: Re: Upgrading GNAT GPS 5.0 -> 5.3
Date: Thu, 14 Aug 2014 15:14:59 +0300
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Date: 2014-08-14T15:14:59+03:00
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Egil H H wrote:

> On Wednesday, August 13, 2014 10:10:31 PM UTC+2, Victor Porton wrote:
>  
>>    package Linker is
>> 
>>       for Linker_Options use ("-lraptor2");
>> 
>>    end Linker;
>>
> 
> From the GPRbuild User's Guide (emphasis mine):
> Linker.Linker_Options:
> This attribute specifies additional switches to be given to the linker
> when linking an executable.
> *It*is*ignored*when*defined*in*the*main*project* and taken into account in
> all other projects that are imported directly or indirectly. These
> switches complement the Linker.Switches defined in the main project. This
> is useful when a particular subsystem depends on an external library:
> adding this dependency as a Linker_Options in the project of the subsystem
> is more convenient than adding it to all the Linker.Switches of the main
> projects that depend upon this subsystem.
> 
> So, try to use Linker.Switches or Linker.Default_Switches instead of
> Linker.Linker_Options.

The solution was to add -lraptor2 to the Librdf subproject (and remove it 
for the main project Test).

I don't know why it works this way.

-- 
Victor Porton - http://portonvictor.org