My guess is that although its all GCC 4.2.1, it may not be the exact same GCC Nokia used which might produce slightly different output given the same input.
That said, it SHOULD be possible to identify which compiler Nokia used. The most likely candidate is either something from http://repository.maemo.org/pool/fre...ree/g/gcc-4.2/ or something from the scratchbox repos although I dont know how Nokia did things.