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(A suggestion: move this question to the OpenCL forum: OpenCL )
I think the AMDGPU-PRO linux driver only supports OpenCL 1.2, and for OpenCL 2.0, the Catalyst linux driver is needed.
However, there have been messages about problems with the W8100 using some versions of the driver, so if you find problems, an older driver version might be better.
(Also, I think AMD is moving toward their open source ROCm stack for OpenCL and HPC. But ROCm currently requires a special Linux kernel. Radeon's ROCm 1.5 OpenCL Support Is Working Out Better - Phoronix )