carlosgalvezp wrote:

> what is the expected behavior for code expanded from macros defined in system 
> header?

As it is right now, we do not perform any expansion of the `SourceLocation` 
before checking if it is in a system header, so the behavior is that macros 
coming from system headers won't be analyzed.  The rationale being that a user 
typically cannot change the contents of a system macro anyway.

If this is deemed too aggressive I can change it to perform the check on the 
expanded location instead. This would be consistent with the reverted patch as 
well as some checks that already do `unless(isExpansionInSystemHeader)`.

https://github.com/llvm/llvm-project/pull/151035
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