jansvoboda11 wrote:

Do you have any concerns about the consistency of `FileManager` caches?

I can see a situation where we ask `FileManager` about the same relative path 
_before_ and _after_ setting the parsed `FileSystemOptions`. The second call 
would blindly return the cached result, effectively ignoring 
`-working-directory` for that file.

https://github.com/llvm/llvm-project/pull/84525
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