I read from the GCC 4.9.0 release notes that http://gcc.gnu.org/gcc-4.9/changes.html
Support for Cilk Plus has been added and can be enabled with the -fcilkplus option. Cilk Plus is an extension to the C and C++ languages to support data and task parallelism. The present implementation follows ABI version 1.2; all features but _Cilk_for have been implemented.
I wonder if _Cilk_for is the only feature that is missing from the GCC 4.9.0 release as well as the mainline branch.
Another question is about the libcilkplus in the GCC. For patches to libcilkplus in GCC, is http://www.cilkplus.org/submit-cilk-contribution still the right place to submit a patch? If yes, how often is the GCC libcilkplus synced with the upstream version?