It looks like -Weverything for gcc would make a lot of code not compile (along with -Werror). For example, it would include -Weffc++, right? Those are warnings if your code just doesn't obey one guy's now-outdated opinions of what C++ should look like.

That's what this says at the bottom:

https://github.com/Tuplanolla/gcc-weverything

> For example, it would include -Weffc++, right?

Maybe, but where's the problem ? Just add -Wno-effc++ afterwards.

Yes, -Weverything + -Werror is often a silly combination. That isn't a GCC-specific problem, though. Clang with both flags will fail to compile quite a lot of code, too.

As the other reply points out, you can just use -Wno-effc++ on top of -Weverything. You could also avoid that particular problem by not using C++ ;-).

Note that Clang recommends you don't use -Weverything because it contains warnings that are in development or have a known high false-positive rate.