[Bug c++/71675] __atomic_compare_exchange_n returns wrong type for typed enum

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71675

--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch posted for review:
https://gcc.gnu.org/ml/gcc-patches/2016-06/msg01896.html