Eli Bendersky added the comment: A minimal fix would be to update the documentation. A more comprehensive fix would be to tweak ctypes to reject unions and bit-fields when running on non-x86 (does this work for ARM and other non-Intel archs?) An even more comprehensive fix would be to make this work, but that would require forking libffi and should presumably be first implemented upstream. ---------- assignee: -> docs@python components: +Documentation nosy: +docs@python, eli.bendersky stage: -> needs patch versions: +Python 3.3, Python 3.4 _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue16575> _______________________________________