[cfe-dev] Check if inside a header file

[Nikola Smiljanic]

Is there a way to know if I'm inside a header file in the Preprocessor
class. I've only been able to find warn_using_directive_in_header that does
a similar check, only to realize that it's not 100% correct. It
uses SourceMgr.isInMainFile which is not right if you pass a header file
directly, no warning is generated in that case.
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