https://bugzilla.redhat.com/show_bug.cgi?id=2000219
--- Comment #12 from serge_sans_paille sguelton@redhat.com --- First, thanks @mkulik for reviving the thread.
Second, I updated to LLVM 13:
Spec URL: https://sergesanspaille.fedorapeople.org/llvm-libunwind.spec SRPM URL: https://sergesanspaille.fedorapeople.org/llvm-libunwind-13.0.0-1.src.rpm
I think I addressed all the issue you pointed out, except for libunwind.so.X where I just added a comment in the sepcfile to explain the situation.