[Bug default/26669] New: Use existing DWARF file as a reference for multifile mode

[Bug default/26669] New: Use existing DWARF file as a reference for multifile mode

[annulen at yandex dot ru]

https://sourceware.org/bugzilla/show_bug.cgi?id=26669

            Bug ID: 26669
           Summary: Use existing DWARF file as a reference for multifile
                    mode
           Product: dwz
           Version: unspecified
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: default
          Assignee: nobody at sourceware dot org
          Reporter: annulen at yandex dot ru
                CC: dwz at sourceware dot org
  Target Milestone: ---

I think it might be beneficial to add a modification to multifile mode,
allowing to "include" existing file as a "common file" and reference its DIEs
in file which is currently being optimized.

For example, there are Qt libraries, and we run dwz over all their debug info
and produce common file, e.g. qt_common.debug. This file contains information
about data types and macros which are commonly used in Qt APIs, so it's quite
likely that debug information of applications and libraries based on Qt will
also include same DIEs. So it seems to me that such feature would allow greater
deduplication of data while being scalable (each package can be optimized
separately)

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