For OpenCL in intel CPUs, see the instalation procedure in https://github.com/intel/compute-runtime/releases and sudo apt-get install opencl-c-headers
# install requirements for dpp
sudo apt-get install libclang-6.0-dev
curl https://dlang.org/install.sh | bash -s
source $(~/dlang/install.sh dmd -a)
# run
make test CL=/usr/include/CL/cl.h
In my PC, make test result was
CL_DEVICE_NAME : Intel(R) Gen9 HD Graphics NEO
CL_DEVICE_VERSION : OpenCL 2.1 NEO
CL_DRIVER_VERSION : 19.26.13286
CL_DEVICE_OPENCL_C_VERSION : OpenCL C 2.0
CL_DEVICE_MAX_CLOCK_FREQUENCY : 1000
CL_DEVICE_MAX_COMPUTE_UNITS : 24
CL_DEVICE_MAX_WORK_ITEM_DIMENSIONS : 3
CL_DEVICE_GLOBAL_MEM_SIZE : 6493552640
CL_DEVICE_LOCAL_MEM_SIZE : 65536
CL_DEVICE_MAX_CONSTANT_BUFFER_SIZE : 3246776320
CL_DEVICE_MAX_MEM_ALLOC_SIZE : 3246776320