I was wondering this myself. Those million line codebases where they are worried about new warnings breaking things should be using a compiler already that doe

I was wondering this myself. Those million line codebases where they are worried about new warnings breaking things should be using a compiler already that doesn't know about the new standard, or one that allows you to set which standard their code is following. I guess I don't understand the problem. Does something like MISRA assume you are using the latest standard? I understand there are regulations involved.