[Bug default/25451] New: [dwz] Add --devel-no-import

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=25451

            Bug ID: 25451
           Summary: [dwz] Add --devel-no-import
           Product: dwz
           Version: unspecified
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: default
          Assignee: nobody at sourceware dot org
          Reporter: vries at gcc dot gnu.org
                CC: dwz at sourceware dot org
  Target Milestone: ---

It would be interesting to have a switch in dwz that:
- skips the generation of DW_TAG_import_unit/DW_AT_import for factored out
  partial units.
- takes this into account in the heuristics

This would allows us:
- to measure what the impact is of having to generate
  DW_TAG_import_unit/DW_AT_import.
- test behaviour of DWARF client in absence of those imports

[ Additionally, it would allow us to speed up create_import_tree (although that
could be achieved more easily by adding an option that skips the optimizations
there). ]

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