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How I wish this were true. For example, lack of Objective-C and Foundation in NaCl is my primary barrier to using it.

https://developers.google.com/native-client/faq#ProgrammingL...

Foundation is a diferent beast than Obj-C.

Obj-C is an open standard language. Foundation is a proprietary library with some key stuff even PATENTED by Apple (for example, the AutoRelease Pool falls into some of the Apple patents).

Is there any actual incompatibility that prevents building an Objective-C runtime for NaCl, or is it simply a matter of ObjC not being included by default?

I've been thinking (warning: pure speculation ahead) that I could target my binaries to LLVM IR and then use the highly-experimental PNaCL. But who knows how long it will be before that is viable.

This is pure speculation, but its possible that the runtime does some tricks for performance (possibly in the method dispatch routine) that the NaCl sandbox doesn't allow.

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