Get OpenCL working on RX580 amdgpu using APT

ocl_enable.md

1. Create this file sudo touch /etc/apt/sources.list.d/rocm.list
2. put this line in there deb [arch=amd64] https://repo.radeon.com/rocm/apt/3.5.1/ xenial main
3. sudo apt update
4. install ocl sudo apt install rocm-opencl3.5.0
5. this script doesnt write icd path to /etc/OpenCL/vendors/ so that's on us
6. touch /etc/OpenCL/vendors/amdocl64.icd
7. echo "/opt/rocm-3.5.1/opencl/lib/libamdocl64.so" > /etc/OpenCL/vendors/amdocl64.icd
8. done. run clinfo. thing should work at this point

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if 3.5.1 doesn work for you, look at the rocm logs to see last version when it had worked for your gpu (it may have never been the case!)