[cfe-dev] How do I implement Diagnostic Callbacks?

[Manasij Mukherjee]

Hi everyone,
I want my callback to be executed whenever clang tries to report an
undeclared identifier.
This callback can potentially trigger another note or fixit diagnostic.

If I have access to a clang::CompilerInstance Object, how do I set this
kind of system up?

I would also like to know possible alternatives for achieving this.
Manasij Mukherjee
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