[Bug c++/78949] incorrect "unused variable" warning with SSE2

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78949

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Jan  4 21:34:27 2017
New Revision: 244075

URL: https://gcc.gnu.org/viewcvs?rev=244075&root=gcc&view=rev
Log:
        PR c++/78949
        * typeck.c (cp_build_unary_op): Call mark_rvalue_use on arg if it has
        vector type.

        * c-c++-common/Wunused-var-16.c: New test.

Added:
    trunk/gcc/testsuite/c-c++-common/Wunused-var-16.c
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/typeck.c
    trunk/gcc/testsuite/ChangeLog