From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00
	autolearn=unavailable autolearn_force=no version=3.4.4
Path: 
 eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!news.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Upgrading GNAT GPS 5.0 -> 5.3
Date: Thu, 14 Aug 2014 17:49:28 +0100
Organization: A noiseless patient Spider
Message-ID: <ly7g2bkodj.fsf@pushface.org>
References: <lsg8hp$2qt$1@speranza.aioe.org> <lymwb8kx3x.fsf@pushface.org>
	<lsgei2$hg4$4@speranza.aioe.org>
	<53ebbf4c$0$32613$862e30e2@ngroups.net>
	<lsggnj$n1m$1@speranza.aioe.org>
	<3261a000-e171-4e03-b3ec-af1bc5cad9d7@googlegroups.com>
	<lsi9f7$kr7$1@speranza.aioe.org>
	<68fn1tyynoal.1la5dyi9o49z9$.dlg@40tude.net>
	<lsimdh$mha$1@speranza.aioe.org>
	<1oacgorukz06m.19lkc26ly0rts.dlg@40tude.net>
	<lsinbk$pbj$1@speranza.aioe.org>
Mime-Version: 1.0
Content-Type: text/plain
Injection-Info: mx05.eternal-september.org;
 posting-host="b814ca014269fd1fa21bc4c05b94dd9e";
	logging-data="21717"; mail-complaints-to="abuse@eternal-september.org";
	posting-account="U2FsdGVkX18DyG1r8UHZ9oNIB4GxWVqXzHR/MIxbC4E="
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (darwin)
Cancel-Lock: sha1:VH25uqWBHfrEE5Ulv2CrSo9TJP4=
	sha1:Q8p0vCmWNF9bu5LL0lOwKksWH3U=
Xref: news.eternal-september.org comp.lang.ada:21763
Date: 2014-08-14T17:49:28+01:00
List-Id: <comp.lang.ada>

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) 

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.