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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: texttools and standard library packages
Date: Thu, 12 Dec 2013 19:00:16 +0100
Organization: cbb software GmbH
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Date: 2013-12-12T19:00:16+01:00
List-Id: <comp.lang.ada>

On Thu, 12 Dec 2013 19:44:58 +0200, Niklas Holsti wrote:

> On 13-12-12 14:34 , agent@drrob1.com wrote:
>> So I decided to use uio_ and uio2_ programs.  These
>> compiled.  But generated lots of linker unresolved symbol errors.  The
>> commandline I used was:
>> 
>> gnatmake -g -gnatf -gnato -fstack-check -gnatVa -gnatwu -gnat2012 -lm
>> -lncurses
> 
> If you want to specify more (non-Ada) libraries to be linked into your
> Ada program, you should either use the pragma Linker_Options in the Ada
> source files or put the linker options in the gnatmake command _after_
> the gnatmake option -largs. At least, as I understand it.

Or, much better, create an externally-built library project, e.g.

project Curses is
   for Externally_Built use "true";
   for Source_Files use ();
   for Library_Dir use "/usr/lib"; -- For example
   for Library_Name use "ncurses";
   for Library_Kind use "dynamic"; -- When linking to a shared library
end Curses;

and use it with your project.

GNAT will do anything needed to link to the library. This includes adding
messy prefixes like "lib" on Linux targets, choosing appropriate file type,
*.dll, *.so, *.lib, *.a etc. Note also that this is transitive. If your
project is itself a library project = may not have linker options by
itself, a third project will nevertheless inherit linker options from
Curses through it.

[pragma Linker_Options is the worst of all three]

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