OpenCL development components will be available in Intel System Studio starting with the current Intel System Studio 2019 Beta program:
The included OpenCL compiler is offered through the ioc64 binary. Try ioc64 --help to see help for invoking the compiler.
Nope... it's -help or no arguments to get the argument list.
For users targeting a specific revision of the OpenCL standard... consider compiler toggles documented as part of clBuildProgram(...) documented in the standard https://www.khronos.org/registry/OpenCL/sdk/2.0/docs/man/xhtml/clBuildProgram.html.
For version 2.0 see this section on the -cl-std toggle:
Also see the ioc64 toggle:
-bo="<build_options>" - Add OpenCL(TM) build options