C compilers are allowed to assume that UB never happens. This means that if there is a code path that results in UB, the compiler can "know" that path will neve

C compilers are allowed to assume that UB never happens. This means that if there is a code path that results in UB, the compiler can "know" that path will never be taken and simply not compile it (or replace it with code that summons demons through your serial port)