Ada GPS IDE Compiler error Undefined symbols for architecture x86_64 - ada

Question

Trying to get GtkAda to work. Didn't compile the lib myself, had a lot of problems and finally I found a precompiled library on the internet. Of course GPS didn't find it even after adding it to my path...
So I added it manually to my project and GPS began the compilation. It is just a simple example to see if everything works. Just beginning to learn programming.
WITH Gtk.Main ;
USE Gtk.Main ;
WITH Gtk.Window ;
USE Gtk.Window ;
WITH Gtk.Enums ;
USE Gtk.Enums ;
PROCEDURE MaFenetre IS
win : Gtk_window ;
BEGIN
Init ;
Gtk_New(win,Window_Popup) ;
win.show ;
Main ;
END MaFenetre ;
Which gave me this error:
gnatlink /Users/laurentlutgen/GPS/mafenetre.ali -o
/Users/laurentlutgen/GPS/mafenetre
Undefined symbols for architecture x86_64:
"_ada_c_enum_value_size", referenced from:
.
.
.
"_pango_tab_array_new", referenced from:
pango_tabs__pango_new in pango-tabs.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit
status gnatlink: error when calling /usr/local/gnat/bin/gcc
gnatmake: * link failed.
[2013-08-01 21:16:46] process exited with
status 4 (elapsed time: 09.38s)
The list of files the compiler complains about is quite long so.
Anyone an idea how to solve this.
I use the last version of gnat (2013) from AdaCore for MacOS X. I use MacOS 10.8.
The GtkAda library is xadalib 2012.
Thanks
Laurent

Answer 1

From what I see, gnatlink does not get passed the libraries needed to link against. You said that you added GtkAda to your project manually. By doing this, you probably missed all the linker options specified in the *.gpr file of GtkAda, so your binary does not get linked against the GTK+ library.
I suggest you try to get GPS to find the installed GtkAda project file. You can do this by setting ADA_PROJECT_PATH before launching GPS. If GtkAda is located in GNAT GPL's default path, it looks like this:
$ export ADA_PROJECT_PATH="/usr/local/gnat/lib/gnat"
$ gps
You said you're using a precompiled binary you found on the internet. Are you aware that GtkAda is bundled with the GNAT GPL compiler? You should use that, unless you want to use gtk-quartz as backend (which doesn't require X11). If that's the case, you may find the instructions I wrote for compiling GPS with gtk-quartz helpful (as Simon already noted).
If you want, you can try my GPS port to OSX. By default, it is able to load the *.gpr files bundled with GNAT GPL. On the Usage page, you find instructions of how to change the ADA_PROJECT_PATH if you installed your GNAT somewhere else.
For further help, you should post the *.gpr file of your project.
Edit:
I stand corrected: GtkAda is in fact not included in the GNAT GPL distribution for whatever reason. As XmlAda is included as project to link against, I was sure GtkAda was too, but it isn't; so using XAdaLib seems to be the easiest option. You have to point ADA_PROJECT_PATH to the installation directory of XAdaLib instead of the usual GNAT one to be able to use GtkAda.

Answer 2

As far as I know none of the GPL'ed GNATs from AdaCore for x86 have the capability to generate 64-bit code. I think I read something to that effect somewhere but cannot remember where.
The issue also came up in the Ada-port of Doom3, so if you can find him he might know for sure.