[PATCH] D127515: [Clang] Change host/device only compilation to a driver mode

[Joseph Huber via Phabricator via cfe-commits]

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We use the flags `--offload-host-only` and `--offload-device-only` to
change the driver's code generation for offloading programs. These are
currently parsed out independently in many places. This patch simply
refactors this to work as a mode for the Driver. This stopped us from
emitting warnings if unused because it's always used now, but I don't
think this is a great loss.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D127515

Files:
  clang/include/clang/Driver/Driver.h
  clang/lib/Driver/Driver.cpp
  clang/test/Driver/cuda-unused-arg-warning.cu

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