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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: GNAT linker error
Date: Sun, 25 Jan 2015 15:35:01 +0100
Organization: cbb software GmbH
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Date: 2015-01-25T15:35:01+01:00
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On Sun, 25 Jan 2015 01:45:53 -0800 (PST), hosszu.gabor90@gmail.com wrote:

> I get the following if I try to compile the GtkAda minimal example of GNAT
> Programming Studio 6.1.0w:
[...]
> gnatlink: error when calling /usr/bin/gcc-4.6
> 
> The command executed by GPS:
> 
> gnatmake -d -P/home/myuser/own projects/ada/AdaTest.gpr -vP2 -j4 -g
 
> The same command works if I try it from a terminal and it also worked in
> GPS 5.0 (which executed the same command as the newest, 6.1.0w) What can
> cause this and how can I make GPS work?

Assuming that the project file AdaTest.gpr has "with gtkada.gpr" 
referenced, it is likely a GNAT-GtkAda-GTK configuration problem, because 
it must reference all libraries needed. But it seems that pixman is not 
there. It might be a version mismatch between cairo you have and cairo 
GtkAda expects. If you run

$ gtkada-config

you will see the include paths and libraries GtkAda uses.

Furthermore, you are using a very outdated stuff. The actual version of 
GNAT is 4.9, the actual version of GTK is 3.8.

E.g. gtkada-config output on Fedora 21 (GtkAda3-devel-3.8.2-2.fc21.x86_64):

-aI/usr/include/gtkada -aO/usr/lib64/gtkada/relocatable -largs 
-L/usr/lib64/gtkada/relocatable -lgtkada -Wl,--as-needed -lgtk-3 -lgdk-3 
-lpangocairo-1.0 -lpango-1.0 -latk-1.0 -lcairo-gobject -lcairo 
-lgdk_pixbuf-2.0 -lgio-2.0 -lgobject-2.0 -Wl,--export-dynamic -lgmodule-2.0 
-pthread -lglib-2.0

No pixman as well.

P.S. There was a big incompatibility leap from GTK 2.x to GTK 3.x. If you 
want to learn GTK and GtkAda, better start with 3.8.

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