The current dwz.1 man page says: The tool handles DWARF 32-bit format debugging sections of versions 2, 3 and 4 and GNU extensions on top of those, though using DWARF 4 or worst case DWARF 3 is strongly recommended. Add documentation on dwz now handling (most of) DWARF 5 plus any limitations (on split-dwarf related forms). See also bug #24726 on some improvements to be made in the future.
https://sourceware.org/pipermail/dwz/2021q1/000853.html
commit bbb68187c64ec9d851c7c01c7fb748d655c7e850 Author: Mark Wielaard <mark@klomp.org> Date: Fri Feb 12 14:11:29 2021 +0100 PR27402 Document DWARF5 support * dwz.1: Explain what subset of DWARF5 is supported, update date, authors and add a reference to the dwz home page and mailinglist.