karka228 wrote:

> Alternatively, you could probably use `DiagnosticsEngine::isIgnored` to check 
> if the `-Wformat-signedness` is enabled or not, and control whether 
> `MatchSignedNess` is `NoMatch` or `Match`, as your first implementation did. 
> This way we can achieve GCC compatibility for 1, 2, 3, 4, 6, 7, while 
> benefitting from a real warning flag. However, in this implementation 
> `-Wformat-signedness` would be an _dummy warning_ which never gets emitted. 
> As far as I know, there isn't anything similar in the codebase, so it might 
> not be the ideal way.

A bit ugly with a _dummy warning_, but it simplifies the implementation. What 
do you other think? Is this an acceptable solution or not?

https://github.com/llvm/llvm-project/pull/74440
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