gui/back broken on AMD64 / segfaults

[David Dederscheck]

Hi,

I just successfully compiled gnustep-gui-0.9.4, gnustep-back-0.9.4, and 
GWorkspace on my Gentoo/AMD64 box. However, upon my attempt to run 
GWorkspace it segfaulted. Actually, any gui application segfaults 
instantly after opening it; yet, all the tools not linked against the 
gui libraries work perfectly.

I suspected a platform issue and investigated the origin of some 
warnings during the build of gnustep-back ("warning: cast to pointer 
from integer of different size"). Obviously, the GUI part of GNUstep 
heavily relies on casts, assuming that integers and pointers have the 
same size. On most platforms this is the case. However, on the AMD64 
platform integers have a size of 32bits as opposed to 64 bits for longs 
and pointers. This most certainly caused my issues.

Has anyone had similar problems on AMD64 - are there any patches that 
might adress the issue? If there is somebody working on some fixes, I 
would be happy to join him.

Regards,
-David