There's a merged pull request on the void-packages repository

sdcc: update to 4.0.0 and update hostmakedepends
https://github.com/void-linux/void-packages/pull/20434

Description:
Automake and texinfo had to be added to hostmakedepends.

@maxice8 I'm tagging you here because you were the one responsible for the previous SDCC PRs.

EDIT: the builds timed out, which was predictable, if unfortunate.