status of cilkplus in gcc?

What's going on with cilkplus in gcc? Is it still being actively used and developed? 

This link says it's been "supported" for some time: https://www.cilkplus.org/which-license#gcc-development.

​Yet it doesn't seem to work with some of the simplest code like below which gives an ICE with gcc.

http://melpon.org/wandbox/permlink/PxcBvdYh1nMvUlsZ

#include <cilk/cilk.h>
#include <vector>

auto f() {
  std::vector<double> v;
  return v;
}

int main() {
  auto x = cilk_spawn f();
  auto y = f();
  cilk_sync;
  return 0;
}