https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70139
--- Comment #6 from Viktor Ostashevskyi <ostash at ostash dot kiev.ua> --- I'm not sure about bug prioritizing policies, but for me it looks like this should get P1 or documentation/release notes for GCC5 and GCC6 should state that -fno-ellide-constructor is broken.