[Bug gdb/20426] gdb does not interpret DWARF annotating imported units fully

["mjw at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20426

--- Comment #2 from Mark Wielaard <mjw at redhat dot com> ---
(In reply to Mark Wielaard from comment #1)
> In other DWARF consumers I have worked with following the specification or
> abstract origin attribute is used to augment the current DIE under
> consideration, not the other way around. To make it work the other way
> around a DWARF consumer would have to keep track of all references through
> DW_AT_specification or DW_AT_abstract_origin to a specific DIE.

And I think it is not a 1-on-1 relationship. There could be multiple DIEs
pointing to the same abstract_origin (maybe the function got cloned). So the
consumer might not even know which one to pick.

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