Any compiler besides Apple that implements:
The Objective-C 2.0 Programming Language (not necessarily all the run-
time libraries) as described here:
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Any other targets besides MacOS?
As I know, GCC has Objective-C 2.0 implementation. Standard libraries,
like Foundation, are available as GNUStep package.
GCC doesn't support all objective-c 2.0 features, such as @property for
example...
Ham
GCC has ObjC 2.0 as well as LLVM.
As I know Apple have own patches for GCC. Regular GCC do not support
all ObjectiveC 2.0 features.
I think better take a look to clang (as part llvm) project.