GCCcore AMD offloading support requires ROCR-Runtime

[nordmoen]

EasyBuild has support for building GCCcore with AMD support (easybuilders/easybuild-easyblocks#2578), however, without ROCR-Runtime no devices are picked up.

I suspect it worked during the PR because ROCm is usually globally installed and always in $PATH on AMD systems. I detected the error on our local system once I had removed the global ROCm install and instead relied only on EasyBuild.

An easy fix would be to add ROCR-Runtime to the dependencies if built withamdgcn support.

[Micket]

If we can enable rocm support in GCC with just a minimal header like we do with nvptx we can also consider enabling it by default (but i have no means of testing of this works, so it would be up to someone to contribute this.

But to add ROC* as dependencies by default for GCC won't be done as it would force most users to filter all that out instead, so this would need to be opt-in.

AMD users can achieve this with a custom parse hook
https://github.com/easybuilders/easybuild-framework/blob/develop/contrib/hooks/hpc2n_hooks.py
to anble the corresponding parameter, or just modify the GCC easyconfigs to add the flag and dependency.