https://github.com/Endilll commented:

Thank you for the PR. Several points:
1) What happens on Windows?
2) `check-clang-python` is just one of the ways to run into this. `cindex.py` 
is a user-facing interface, so we shouldn't emit messages that make sense only 
during development.
3) The fact that `OSError` already contains the message that indicates the 
problem, I think we should explore why it's not properly emitted in the first 
place, before introducing bespoke ways of delivering error messages. 
@DeinAlptraum any thoughts here?

https://github.com/llvm/llvm-project/pull/142353
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