https://developer.nvidia.com/cuda-toolkit has version 10.0.130 available.
The current version in Gentoo is dev-util/nvidia-cuda-sdk-9.2.88
As the nvidia-cuda-toolkit has been updated to this new version. When I synced the portage tree, I got some dependencies on this one which makes a lot of sense to update it as well.
Created attachment 583680 [details]
Try the attached nvidia-cuda-sdk-10.0.130.ebuild using GCC v7.3.0.