Clang has a pretty cool flag to compile objc to c. I believe it exists for Apple to port their few apps to windows (eg iTunes), but I suspect it could be used to build a pure c environment as well.
That is very cool, I think it's `-rewrite-objc`. Presumably it still needs to be linked to the objc runtime. It says it lowers to C++ instead of C though, now I wonder what pieces cannot be implemented using pure c.