[Bug c/28901] -Wunused-variable ignores unused const initialised variables

[mark at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=28901

--- Comment #30 from Mark Wielaard <mark at gcc dot gnu.org> ---
https://gcc.gnu.org/ml/gcc-patches/2016-02/msg01433.html