See https://clang.llvm.org/docs/DiagnosticsReference.html

Then turn off that warning if you don't like/want it.

There is also -Wlogical-op-parentheses, which rather condescendingly implies that you don't know the precedence of || vs &&. (The main use of parentheses is specifically to indicate precedence different from the usual, since otherwise they just add noise to the code and reduce clarity.) I half-expect -Warithmetic-op-parentheses or even -Wop-parentheses to show up in some future version of clang...

Unfortunately there's no corresponding -Wuseless-parentheses, which if present would truly make -Weverything a "damned if you do, damned if you don't".

I think clang added a -Weverything just to prove a point why it's a bad idea to actually contain _all_ warnings in -Wall.

As you say, some warnings are contradictory and it's up to the project to decide which one of them is more important.

You can just use `-Weverything -Wno-effc++` then

Why not have the flag and not use it if you don't want it? That way other users of gcc who want that flag are not deprived of that feature.