In addition to the traditional ``-W`` flags, one can enable **all** diagnostics

by passing :option:`-Weverything`. This works as expected with

:option:`-Werror`, and also includes the warnings from :option:`-pedantic`. Some

diagnostics contradict each other, therefore, users of :option:`-Weverything`

often disable many diagnostics such as :option:`-Wno-c++98-compat`

:option:`-Wno-c++-compat` because they contradict recent C++ standards.

Since :option:`-Weverything` enables every diagnostic, we generally don't

recommend using it. :option:`-Wall` :option:`-Wextra` are a better choice for

most projects. Using :option:`-Weverything` means that updating your compiler is

more difficult because you're exposed to experimental diagnostics which might be

of lower quality than the default ones. If you do use :option:`-Weverything`

then we advise that you address all new compiler diagnostics as they get added

to Clang, either by fixing everything they find or explicitly disabling that

diagnostic with its corresponding `Wno-` option.

Note that when combined with :option:`-w` (which disables all warnings),

disabling all warnings wins.