[PATCH] Create a frontend flag to disable CUDA cross-target call checks

[Reid Kleckner]

The normal way we do this is to create a default-error warning, and then you can say -Wno-my-warning and disable the error. This also suppresses the error in system headers, which might make sense if you can't parse lots of CUDA headers yet, and just want to compile such impossible calls down to 'unreachable'. See for example -W[no-]c++11-narrowing.

I don't think it's very intuitive that -W flags impact errors, but this is the way we've done things for one-off diagnostics like this and I'd rather stay consistent with that until we come up with a better interface later. What do you think?


http://reviews.llvm.org/D9036

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