Re: Linking error on Ubuntu

[Stefano Facchini <stefano facchini gmail com>]

Hi,

Il giorno gio, 27/10/2011 alle 14.07 +0200, Kjell Ahlstedt ha scritto:
> 2011-10-18 15:56, Stefano Facchini skrev:
> > Hi,
> > could anyone using Ubuntu 11.10 have a look at bug 870662
> > (https://bugs.launchpad.net/ubuntu/+source/gtkmm3.0/+bug/870662) and
> > tell me if the same error is obtained?
> Yes.
> > Basically, it seems that I cannot link against gtkmm-3.0 and
> > poppler-glib at the same time.
> >
> Actually, you cannot compile.
> 
> Look at the output from the following commands:
>    pkg-config --cflags gtkmm-3.0
>    pkg-config --cflags poppler-glib
>    pkg-config --cflags gtkmm-3.0 poppler-glib
> 
> The interesting parts are:
>    gtkmm-3.0: -I/usr/include/gtk-3.0
>    poppler-glib: -I/usr/include/gtk-2.0
>    gtkmm-3.0 poppler-glib: -I/usr/include/gtk-2.0 ... -I/usr/include/gtk-3.0
> 
> /usr/include/gdkmm-3.0/gdkmm/rgba.h contains
>    #include <gdk/gdk.h>
> which will include gdk/gdk.h from gtk-2.0, but rgba.h requires the file 
> in gtk-3.0.
> 
> It's not possible to combine gtk-2.0 and gtk-3.0 in the same program.
> 
Thank you for your analysis, I reached to the same conclusion, just
forgot to update the bug.

> You write in the Ubuntu bug:
> 1. The same test program compiles just fine with gtkmm-2.4.
>      Understandable. gtk-3.0 is not included.
> 
> 2. The equivalent C program linked against gtk+-3.0 also compiles fine.
>      I guess that no header files are included from gtk-3.0, and that 
> it's not detected by your extremely simple test program. Have you tried 
> to compile a program that calls a function which exists only in gtk-3.0?
> 
> 3. Moreover, I get no errors with other distributions I tried 
> (Archlinux, openSUSE 12.01), even with gtkmm-3.0
>      Don't know why. I don't know anything about poppler. I installed it 
> only to be able to run your test case. Is there a newer version that 
> uses gtk-3.0? (I got version 0.16.7.) Is the dependency on gtk (or gdk) 
> unnecessary?
> Perhaps pkg-config (or its equivalents) in the other distributions make 
> the C preprocessor search /usr/include/gtk-3.0 before 
> /usr/include/gtk-2.0? Then gtkmm will be happy, but perhaps poppler 
> won't, if you compile a more complicated program than your test case.
> 
It seems that Ubuntu adds gtk-2 to poppler-glib dependencies, while
other distributions don't. And actually it is not required as runtime
dependency (I think it is only required to compile some test cases). I
should file a bug against poppler-glib package in Ubuntu.

Cheers


-- 
Stefano Facchini <stefano facchini gmail com>