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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 19:15:51 +0300
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Date: 2014-08-14T19:15:51+03:00
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Dmitry A. Kazakov wrote:

> On Thu, 14 Aug 2014 18:59:48 +0300, Victor Porton wrote:
> 
>> Dmitry A. Kazakov wrote:
>> 
>>> On Thu, 14 Aug 2014 15:18:49 +0300, Victor Porton wrote:
>>> 
>>>> 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.
>>>> 
>>>> I don't understand.
>>>> 
>>>> Does this mean that it's impossible to link a library to the main
>>>> project?!
>>> 
>>> It means that the option is intended for library projects not for the
>>> client projects.
>> 
>> But if I wanted to add linker option -lraptor2 to a non-library project,
>> what I would need to do?
> 
> You never need that for a library. However, you were already answered in
> this thread how to do this:
> 
> project Messy_Client is
>    ...
>    package Linker is
>       for Default_Switches ("ada") use ("-L<some-path>", "-lraptor2");
>    end Linker;
> 
> end Messy_Client;

In GNAT GPS 5.3 this works only if Messy_Client is a library project (and 
with Linker_Options instead of Default_Switches).

IN GNAT 5.0 it worked for non-library projects also.

It looks like a bug in GNAT GPS 5.3.

>> Many non-library projects need to link to libraries.
> 
> They should *always* use library projects instead of linking directly to
> external libraries.

Why?!

It is completely legit for a non-library project to link to a C library 
directly to obtain some functionality from a C library.

I don't understand you.

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