Enable beta extensions

[ahesham-arm]

No description provided.

[bashbaug]

Thanks for the PR! I started taking a look at this yesterday after I saw the CI was failing for #321, but I didn't get very far.

Instead of a cmake option, would it be better to enable beta extensions unconditionally for the tests?

OpenCL-CLHPP/tests/CMakeLists.txt

Lines 94 to 95 in 02cbac3

	add_definitions(-DCL_TARGET_OPENCL_VERSION=300)
	add_definitions(-DCL_EXPERIMENTAL)

My rationale is:

• I don't think the tests can possibly work without beta extensions due to the way the mock files are created.
• We don't have cmake options for anything else like this, such as CL_TARGET_OPENCL_VERSION.

I'd be OK adding something like a CL_HPP_ENABLE_BETA_EXTENSIONS in addition, if we choose to. This would be similar to how we have CL_HPP_TARGET_OPENCL_VERSION to set CL_TARGET_OPENCL_VERSION. Or, we could just have clients define CL_ENABLE_BETA_EXTENSIONS directly before including opencl.hpp if they want to enable beta extensions.

[ahesham-arm]

Thanks for the PR! I started taking a look at this yesterday after I saw the CI was failing for #321, but I didn't get very far.

Instead of a cmake option, would it be better to enable beta extensions unconditionally for the tests?

Well, looks like we both reached the same conclusion at the same time :)

[bashbaug]

Test-only fix, not waiting to merge.