Compiler warnings are good, but they are not enough

PVS-Studio vs GCC - http://www.viva64.com/en/b/0425/

PVS-Studio vs Clang - http://www.viva64.com/en/b/0446/

And reddit discussion: https://www.reddit.com/r/programming/comments/5aixuu/a_new_portion_of_bugs_in_llvm/