040000 tree 617f46dca85cd9b1ef7a872cd8385ea87f72a14d	cl_ext_cxx_for_opencl
040000 tree c699d39ddaaec2d8c6f01b756eaa1ae9bbca1e09	cl_khr_command_buffer
040000 tree f0b33e0de83db85ae477b2f8f11589793994a17a	cl_khr_semaphore