I will report it to the upstream, and let you know the result here.
Here is the upstream ticket I opened now.
https://bugs.ruby-lang.org/issues/17385
I am running the SRPM on the private-ruby-3.0 branch for f33 too just
in case.
```
$ koji build --scratch --nowait --arch-override=x86_64 f33
ruby-3.0.0-0.1.20201204git1cfc6e7b7a.fc34.src.rpm
https://koji.fedoraproject.org/koji/taskinfo?taskID=57179644
```
The build succeeded with gcc 10.2.1-9.fc33 on f33.
--
Jun | He - His - Him