make_ptr in multi-pointer class is not implemented now.

Current underlying values of cl::sycl::info::device_type do not lend themselves for bitwise operations.

enum class device_type : pi_uint64 {
  cpu         = PI_DEVICE_TYPE_CPU,
  gpu         = PI_DEVICE_TYPE_GPU,
  accelerator = PI_DEVICE_TYPE_ACC,
  // TODO: figure out if we need all the below in PI
  custom      = CL_DEVICE_TYPE_CUSTOM,
  automatic,
  host,
  all         = CL_DEV

We worked very hard to get everything working in Travis. this demonstrates how to build and run everything, but it would be ideal if we translated this information into documentation for how to build the dependencies.

Implement proposed spec maintenance change: KhronosGroup/SYCL-Docs#42

The cl_ types are not needed in general, however they should still be kept in the OpenCL C interop sample code.

The Makefiles should define CXXFLAGS etc with ?= instead of = so that it doesn't matter if you set the variable on the left or right and side of the make invocation, i.e.:

VAR=val make
make VAR=val

Check that these links are appropriate. In general, we should not refer to product docs.

./elements/oneMKL/source/domains/dft/mkl-dft-descriptor-mkl-dft-precision-mkl-dft-domain-commit.rst:66: Functions <https://software.intel.com/en-us/onemkl-developer-refer\
ence-c-status-checking-functions>`__
./elements/oneMKL/source/domains/dft/mkl-dft-descriptor-mkl-dft-precision-mkl-dft-domain-

Right now it is not clear which benchmarks are new, and which are ports of existing benchmarks. We should add notes in each benchmark source file, referring to the original source, if there is any.