xgsa added a comment.

In https://reviews.llvm.org/D40671#954661, @alexfh wrote:

> In https://reviews.llvm.org/D40671#953888, @aaron.ballman wrote:
>
> > FWIW, I think we should do something about unknown check names in NOLINT 
> > comments, but that can be done as a follow-up patch. If we're ignoring the 
> > comment, we might want to diagnose that fact so users have an idea what's 
> > going on.
>
>
> IIUC, cpplint can output a diagnostic about unknown categories inside NOLINT 
> and about NOLINT directives that happen on lines where no warning is emitted. 
> Both would be useful in clang-tidy, IMO.


I agree with your statements and I think there should be the following 
diagnostics about NOLINT usage:

- as you described, using of NOLINT with unknown check names;
- using of NOLINT for the line, on which there is no diagnostics (at all with 
NOLINT and for the swpecified diagnostics); this should help to detect dangling 
NOLINT comments, that have no meaning anymore.

Moreover, there should be a way to turn on/off these diagnostics, so possibily 
they should be a separate checks. What do you think? Is there a way for a check 
to collect the emitted diagnostics?


https://reviews.llvm.org/D40671



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