[Bug c++/64867] warning for passing non-POD to varargs function

[tromey at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64867

--- Comment #6 from Tom Tromey <tromey at gcc dot gnu.org> ---
Also, -Wconditionally-supported triggers other warning as well.
It would be more convenient if different warnings were individually
controllable; and then something like -Wconditionally-supported
would act as if I'd specified all the sub-options.