Mostly just having to compile for an additional architecture, and a few new bugs to chase down due having to develop cross-arch. If your code is all in a high

Mostly just having to compile for an additional architecture, and a few new bugs to chase down due having to develop cross-arch. If your code is all in a high level language and your libraries are ported (a big if) then it won't be a huge burden but if you're relying n dynamic code generation or self-modifying code or some arch-specific hacks or the like you may have a lot more trouble.