stevewan added a comment.

In D105112#2858702 <https://reviews.llvm.org/D105112#2858702>, @thakis wrote:

> 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

Posted fix rGe2904c8e0fa901adeefe579297cb2ece2757fb18 
<https://reviews.llvm.org/rGe2904c8e0fa901adeefe579297cb2ece2757fb18>. Sorry 
for the churn.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D105112/new/

https://reviews.llvm.org/D105112

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