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=-0.3 required=5.0 tests=BAYES_00,
	REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4
X-Google-Thread: a07f3367d7,7c6bcf9f4b4496b1
X-Google-Attributes: gida07f3367d7,public,usenet
X-Google-NewGroupId: yes
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news2.google.com!news3.google.com!proxad.net!feeder1-2.proxad.net!194.25.134.126.MISMATCH!newsfeed01.sul.t-online.de!t-online.de!news.belwue.de!newsfeed.arcor.de!newsspool2.arcor-online.net!news.arcor.de.POSTED!not-for-mail
From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Ada file depends on C file
Newsgroups: comp.lang.ada
User-Agent: 40tude_Dialog/2.0.15.1
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Reply-To: mailbox@dmitry-kazakov.de
Organization: cbb software GmbH
References: 
 <87bfc895-8c74-4fe9-86b6-99416006ab65@z34g2000vbl.googlegroups.com>
Date: Thu, 17 Sep 2009 15:29:29 +0200
Message-ID: <xsxpf45k2x1r.1uq51jiptll16.dlg@40tude.net>
NNTP-Posting-Date: 17 Sep 2009 15:29:29 CEST
NNTP-Posting-Host: e025c40a.newsspool3.arcor-online.net
X-Trace: 
 DXC=:[Z4@DLkW4IA<A_d>@P]\DMcF=Q^Z^V3H4Fo<]lROoRA^YC2XCjHcbIBX`cZ>N=R`HDNcfSJ;bb[EFCTGGVUmh?DLK[5LiR>kgB<=o^?kdjEKC
X-Complaints-To: usenet-abuse@arcor.de
Xref: g2news2.google.com comp.lang.ada:8365
Date: 2009-09-17T15:29:29+02:00
List-Id: <comp.lang.ada>

On Thu, 17 Sep 2009 05:38:43 -0700 (PDT), mockturtle wrote:

> Dear all,
> I have a question that I am afraid is awfully trivial, but I spent
> half a morning without finding any answer.
> 
> My setup: I am working with GPS and I have an Ada procedure (say
> Interface_to_Addr in foo.adb) that needs to call a small C function
> (char *interface_to_ip (char*)) defined in interface_to_ip.c.  So, in
> my Ada code I wrote
> 
>    function interface_to_ip(interf : chars_ptr)  return chars_ptr;
>    pragma Import(C, interface_to_ip);
> 
> Everything compiles fine, but when it is time to link, the linker
> complains (correctly) that it cannot find "interface_to_ip".  The
> problem is that the compiler does not know that interface_to_ip is in
> interface_to_ip.c, or, in other words, it does not know that foo.adb
> depends on interface_to_ip.c.
> 
> Currently I solved by adding the line
> 
>     pragma Linker_Options("../../interface_to_ip.o");
> 
> and by compiling "by hand" interface_to_ip.c to interface_to_ip.o, but
> this solution is *UGLY*.
> 
> Everything would be fine if I could tell to the compiler that foo.adb
> depends on interface_to_ip.c, but I do not know how to do it.  I
> looked under the GPS "Project" menu, browsed the GNAT user & reference
> manuals (although not in the deepest detail) and googled for a while,
> but I could not find an answer.

The project file (*.gpr) has "package Linker". You can put linker options
there for example:

   package Linker is
      for Default_Switches ("ada")
         use ("-g", "-lgmem", <...further options...>);
   end Linker;

Alternatively, and probably better solution, would be to include the C
source into the project. AFAIK GPS supports C. In that case you should be
able to handle interface_to_ip.c exactly as you do Ada files.

BTW, never use GPS->Project->Edit Project Properties. Notepad is your
friend! (:-))

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de