Cocoa: Debugging of 64 bit applications not possible

gdb does not detect the correct architecture type.
It only does autodetection if it gets the executable passed on the command line.
if that isn't done, it needs a command line argument "-arch=i386" or "-arch=x86_64" to override the "default" gdb architecture setting.
(It might be possible to set this in a running gdb as well)