Hi, I posted this same question here https://community.amd.com/message/2892646#comment-2892646
and I've been suggested to try ask the question in the OpenCL forum.
It is mentioned in the HPC section (Accelerators for High Performance Compute | AMD )
that AMD supports several programming standards, including OpenACC.
I would be curious to know which compilers support OpenACC on AMD GPUs.
I had a few (troublesome, to be fair) experiences with PGI up to version 16.10 on a FirePro W9100,
but the support for AMD hardware has been discontinued in later versions.
After some googling, I found below links regarding OpenACC support on AMD GPUs. Hope these information helps.