There is an updated pull request by Johnnynator against master on the void-packages repository

https://github.com/Johnnynator/void-packages gcc10
https://github.com/void-linux/void-packages/pull/24258

[wip] gcc: update to 10.2.0
[ci skip]

A patch file from https://github.com/void-linux/void-packages/pull/24258.patch is attached