bob.wilson added a comment. Regarding the FIXME in lib/Frontend/CompilerInvocation.cpp: I agree with Hal that you can remove that. We used to complain about unsupported -fno-builtin-* options (and until now they have *all* been unsupported), but in r191434, Rafael changed clang to silently ignore those options, with the explanation that it matches gcc's behavior. Assuming that gcc has not changed in that regard, it makes sense that we should continue to ignore -fno-builtin-* for unsupported options.
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