https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80038
--- Comment #8 from Jeffrey A. Law <law at redhat dot com> --- It's unfortunate and directly related to the maintenance effort involved. The deprecation plan for Cilk+ would have code in gcc-7, but the code would be removed prior to the gcc-8 release. Unless someone wanted to step up and maintain the code -- so far efforts to find new maintainers for Cilk+ haven't produced any results.
