This is a long-needed, but gratefully accepted improvement to GCC. I've seen in the wild just how many people see a 'warning' and consider it ignorable, even t

This is a long-needed, but gratefully accepted improvement to GCC. I've seen in the wild just how many people see a 'warning' and consider it ignorable, even though many warnings in GCC are certain indication of broken code in pretty much anything new written in the last 35 years. It's important to bear in mind the main change here is to stop wild C programmers from trying to run or release code that's almost certainly broken, because the diagnostic they got wasn't explicit enough. People can still force the old behaviour if they need to.