But then if you forget to take those bits out, you now have unused things in your checked in code, which is exactly what the compiler was trying to prevent! Th

But then if you forget to take those bits out, you now have unused things in your checked in code, which is exactly what the compiler was trying to prevent! The build flags approach is more comprehensive and safer, because it simply won't compile when you build without the -warnunused flag (for example in your ci trigger off your git repo).