Created attachment 220851 [details] patch Alternate approach, just build with the default GCC.
Yep, thank you! And hopefully we can get the clang or clang/FreeBSD folks to fix their side in the next seven or so months (or find a way in upstream GCC).
A commit references this bug: Author: pkubaj Date: Wed Dec 23 20:43:45 UTC 2020 New revision: 559027 URL: https://svnweb.freebsd.org/changeset/ports/559027 Log: lang/gcc11-devel: fix build on powerpc64 head PR: 252071 Approved by: gerald (maintainer) Changes: head/lang/gcc11-devel/Makefile