[PATCH] D121175: [clang] Add -Wstart-no-unknown-warning-option/-Wend-no-unknown-warning-option.

[Zhiwei Chen via Phabricator via cfe-commits]

condy added a comment.

IMHO, it's the duty of build systems. CMake provides `check_cxx_compiler_flag` to report unknown options.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D121175/new/

https://reviews.llvm.org/D121175