[Bug c++/77299] [9/10/11/12 Regression] No warning for unused "INT64_MAX" and similar constants due macro tracking from system headers

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77299

--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #9)
> GCC 5 warned, but we lost the warning with r230365

That was "Merge C++ delayed folding branch."

> GCC 8 warned, but we lost the warning with r267272

And that was "C++: more location wrapper nodes (PR c++/43064, PR c++/43486)"