aaron.ballman added a comment.

In D147844#4299418 <https://reviews.llvm.org/D147844#4299418>, @chaitanyav 
wrote:

> @aaron.ballman just for learning, can you point me to the code where a 
> warning is selectively enabled/disabled based on a flag. For e.g. 
> -Wunused-comparison

Sure! This is handled automagically for you by tablegen when you use 
`DefaultIgnore` while defining the diagnostic, as in: 
https://github.com/llvm/llvm-project/blob/c4505158950f2211d8c4b429049f2cd765f3e092/clang/include/clang/Basic/DiagnosticSemaKinds.td#L28


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D147844/new/

https://reviews.llvm.org/D147844

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