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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 20:18:34 +0300
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Date: 2014-08-14T20:18:34+03:00
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Simon Wright wrote:

> Victor Porton <porton@narod.ru> writes:
> 
>> Dmitry A. Kazakov wrote:
>>
>>> On Thu, 14 Aug 2014 18:59:48 +0300, Victor Porton wrote:
> 
>>>> 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.
> 
> Could you please run
>    gprbuild --version
> on the command line and tell us the version it reports.
> 
> For example, here I get
> 
>    $ gprbuild --version
>    GPRBUILD GPL 2014 (20140331) (x86_64-apple-darwin13)

$ gprbuild --version
GPRBUILD 2014 (unknown)  (i486-pc-linux-gnu)
Copyright (C) 2004-2014, Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A 
PARTICULAR PURPOSE.

> and I added
> 
>    package Linker is
>       for Default_Switches ("ada") use ("-lraptor2");
>    end Linker;
> 
> to an existing non-library project. I don't have libraptor2, so this
> failed to link, but the switch was copied through correctly:
> 
>    gcc test-main.o -lraptor2 -L/usr/lib -ltk8.5 -ltcl8.5 -o test-main
>    ld: library not found for -lraptor2
>  
>>>> 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 think Dmitry means that you will find things easier if you use library
> projects for external libraries.

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