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e81b42fde9
Although this is nominally a -W option, we actually handle it in the driver exactly as an f-group flag that's translated directly to -mllvm. That means f_Group (and unintuitively, not W_Group) has the semantics we want to make it behave like a standard warning flag: no automatic forwarding, no warning for link invocations and compile-only. Silences diagnostics like: [691/1545] Linking CXX executable bin/llvm-diff clang-3.5: warning: argument unused during compilation: '-Wframe-larger-than=2048' (Hopefully we can move towards handling these in the frontend but that'll require some infrastructure work.) llvm-svn: 212670