[Bug debug/66869] [6 regression] -Wunused-function no longer warns for static declarations without definition

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66869

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Jason, thoughts on where to do this for C++?