[clang-tools-extra] [clang-tidy] Extend bugprone-narrowing-conversions with time_t narrowing option (PR #209856)

[Radovan Božić via cfe-commits]

bozicrHT wrote:

Hi @zeyi2, thanks for the review!

I have one design question: would conservative fix-it hints be appropriate for this check, or should this PR remain diagnostics-only?

I was considering only very limited local-variable cases, such as changing `int i = t;` to `time_t i = t;` when the initializer involves `time_t`. I would avoid fix-its for function parameters, return types, fields, macro expanded code, and anything that may affect API/ABI.

Would that be useful for `bugprone-narrowing-conversions`, or too much for this check?

https://github.com/llvm/llvm-project/pull/209856