Of course compilers warn about this, but too many programmers just ignore warnings. Some warnings can be ignored without dire consequences. The problem is whe

Of course compilers warn about this, but too many programmers just ignore warnings. Some warnings can be ignored without dire consequences. The problem is when compilation emits 100 warnings which are not critical it is easy to miss 101th which is critical. And until you'll fix all warnings you cannot build with -Werror. I like BSD approach here: they use different warning levels (WARNS) for different directories and compile all code with -Werror.