There is an updated pull request by oreo639 against master on the void-packages repository

https://github.com/oreo639/void-packages gcc11
https://github.com/void-linux/void-packages/pull/34902

gcc: update to 12.1.0
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Edit: this PR had been updated for gcc 12.1.0

This PR depends on: https://github.com/void-linux/void-packages/pull/32330

I tested this PR with glibc and after updating glibc, it seems to work fine.
I also tested this PR with x86_64-musl, and it appears to run fine in a musl chroot, and recompiling and installing musl with gcc 12 doesn't appear to result in any issues. (more testing is needed)

Please let me know if there are any issues.

I compiled base-system to ensure that compiles and it appears to work fine.

#### Testing the changes
- I tested the changes in this PR: **briefly**

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#### Local build testing
- I built this PR locally for my native architecture, (x86_64-glibc)
- I built this PR locally for these architectures (if supported. mark crossbuilds):
  - x86_64-musl

A patch file from https://github.com/void-linux/void-packages/pull/34902.patch is attached