thakis added a comment. Hi, you have to bump clang/include/clang/Serialization/ASTBitCodes.h's VERSION_MAJOR after adding a LangOption, else builds with LLVM_APPEND_VC_REV=NO won't invalidate their module cache correctly. See e.g. https://reviews.llvm.org/rGb8b7a9dcdcbc Without that, tests are broken on bots with LLVM_APPEND_VC_REV=NO , eg http://45.33.8.238/linux/50460/step_7.txt
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