https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84783
--- Comment #1 from Sebastian Peryt <sebastian.peryt at intel dot com> --- It was added in r249759 I can see it in latest trunk. Maybe you have some old version of GCC?
sebastian.peryt at intel dot com Mon, 12 Mar 2018 08:15:38 -0700
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84783
--- Comment #1 from Sebastian Peryt <sebastian.peryt at intel dot com> --- It was added in r249759 I can see it in latest trunk. Maybe you have some old version of GCC?