jansvoboda11 added a comment.

Ah, I now see that there are modes where `ASTUnit` gets configured with 
command-line arguments.

I'm not very familiar with its clients, but I'd be inclined to:

1. If the original `HeaderSearchOptions` didn't have any VFS overlay files, 
adopt the PCM ones.
2. If the original `HeaderSearchOptions` did have VFS overlay files of its own, 
error out if the PCM has different ones.

Any thoughts?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D135634/new/

https://reviews.llvm.org/D135634

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