That's true. There are some that are pedantic (-Wpedantic, anyone?) and excessive, but I find it's easier to evaluate those on a case-by-case basis, or opt-out

That's true. There are some that are pedantic (-Wpedantic, anyone?) and excessive, but I find it's easier to evaluate those on a case-by-case basis, or opt-out of the ones that are generally useless, than it is to ignore an entire class of warnings. For instance, a lot of projects I've worked on prefer to be ready for the day if/when the code has to be compiled with a different compiler, so -Wpedantic is great.