I have had instances where upgrades of the compiler added bugs, or where warnings identified new potential bugs. And not always revolving around the error flags

I have had instances where upgrades of the compiler added bugs, or where warnings identified new potential bugs. And not always revolving around the error flags either. The update after analysis and probably some retesting concluded as trivial, but before undertaking the change I think it has a risk of having the same impact as a change of software. It’s not -Werror at the root of this general work (yes it turned that way in this specific case), but the analysis and recheck after was the core work from the compiler upgrade.