I'm relatively new to gdb hacking.  Does it mean that
inter-compilation-unit references will work and
-feliminate-dwarf2-dups will work?  That would be great :)

Just today I ported my version of the inter-cu patch to gdb CVS
(what coincidence).  Anyway I'm quite busy these days, and the patch
isn't exactly efficient, nor do I know enough about DWARF-2 to make it
work in all but the most common cases, so I'm glad someone good at
that finally have the time to hack this.

Anyway I'll attach my version of the patch here, which should make
-feliminate-dwarf2-dups work.  Not that anyone should read that (I'm
not attempting to fork...), but I welcome advice from old-schoolers
about hacking in large software projects like this in general --- just
don't humiliate me too much if I have some fundamental misunderstanding :)

P.S. I'm Wang Qingchuan, and I just finished the copyright assignment
process (#156541).  Seems that it will just become a memorial.

P.P.S.  Better CC me since I'm not normally subscribed to the list.