https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281765

            Bug ID: 281765
           Summary: llvm - ThinLTO never uses more than a single thread by
                    default
           Product: Base System
           Version: 14.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: b...@freebsd.org
          Reporter: dii...@freebsd.org
                CC: bro...@freebsd.org, d...@freebsd.org,
                    pku...@freebsd.org

Maybe I'm missing something obvious/intentional but according to upstream
documentation [1] it should default to one thread per physical core but at
least I have never seen that happen on various amd64 and aarch64 systems. Addin
-Wl,--thinlto-jobs=N to LDFLAGS makes it work as expected though.

1: https://clang.llvm.org/docs/ThinLTO.html

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