debuginfod vs libthread_db.so

debuginfod is pretty nice, since it allows you to debug a core file
generated on one system on another, without worrying about debug
information, so long as you point your debuginfod settings in the right
direction.

However, will it work for libthread_db.so? If not, then this breaks
down if the two systems use different libc versions that have
incompatible libthread_db.so.


(tangent: is it possible to express libthread_db.so code as DWARF
expressions? if so it will be possible to get rid of libthread_db.so,
by having libc encode accessors to thread information as some DWARF
expressions, and teaching gdb to use those expressions instead of
calling libthread_db.so)