Re: [GtkGLExt] Compile error "virtual thunk"

["Timothy M. Shead" <tshead k-3d com>]

On Sun, 2006-08-13 at 19:15 -0400, jlm wrote:
> I am upgrading from gtkglextmm 1.1.0 to 1.2.0. I believe I have made all 
> of the necessary changes to my code, but when I link I get this error:
> 
> /usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.6/../../../libgtkbonus.so: 
> undefined reference to `virtual thunk [v:0,-24] to 
> Gtk::GL::DrawingArea::~DrawingArea [in-charge]()'
> /usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.6/../../../libgtkbonus.so: 
> undefined reference to `virtual thunk [v:0,-24] to 
> Gtk::GL::DrawingArea::~DrawingArea [in-charge deleting]()'
> 
> Now I have a library (libgtkbonus) that uses gtkglextmm, as well as the 
> main program. In the library I use the Gtk::GL::DrawingArea, but not in 
> the main program. I have compaired my use of this widget to that in 
> simple-darea.cc, and can find only one difference. The 
> Gtk::GL::DrawingArea in simple-darea.cc is initialized with a "config" 
> parameter, and mine is not. I have my glconfig code inside the 
> sub-class' constructor.

I'm not familiar with the error message, but weird linker problems with
C++ libraries are usually caused by trying to link together binaries
that have been built with different versions of gcc.  Make sure that all
of the libraries that you are linking and your application are all built
with the same gcc.

Tim