[PATCH] D142196: [clang][Lex] Add back PPCallbacks::FileNotFound

[Jonas Hahnfeld via Phabricator via cfe-commits]

Hahnfeld added a comment.

I just checked and this "simplified" version of the callback would give us enough information to implement all we need in ROOT (plus some, the `bool` return value is nicer than temporarily playing with `SuppressIncludeNotFoundError`). For an upstream test, I could implement a unit test in `clang/unittests/Lex/PPCallbacksTest.cpp` or a "toy" tooling where `#include <file.h?>` is ignored if `file.h` doesn't exist? What do you think (assuming the general idea of adding this callback is fine)?


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https://reviews.llvm.org/D142196