[Bug c++/83942] [8 Regression] False -Wunused-but-set-variable when const scoped enum is cast to int

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83942

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Mon Jan 29 16:56:28 2018
New Revision: 257155

URL: https://gcc.gnu.org/viewcvs?rev=257155&root=gcc&view=rev
Log:
        PR c++/83942 - wrong unused warning with static_cast.

        * cvt.c (ocp_convert): Call mark_rvalue_use.

Added:
    trunk/gcc/testsuite/g++.dg/warn/Wunused-var30.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/cvt.c