Haven't had time to investigate, but it seems libxul might have
issues.
Errors show up in all 3 ports (www/firefox-esr, www/mozilla-firefox
and mail/thunderbird)
Looks like:
> Extracting debug info from lib/thunderbird/libxul.so.34.0
dwz: lib/thunderbird/.debug/libxul.so.34.0.dbg: Couldn't find DIE referenced by DW_AT_abstract_origin
I've found a small tool called dwarf-check on github (in go... well)
hub$ dwarf-check libxul.so.34.0
error initializing dwarf state examiner: malformed dwarf at offset 450264449: nstack underflow
so both info seem to point at a bug in clang/lld
Quick&dirty port of dwarf-check attached
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