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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: dwz@sourceware.org
Subject: [Bug default/25142] New: Add optimization levels
Date: Tue, 01 Jan 2019 00:00:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D25142

            Bug ID: 25142
           Summary: Add optimization levels
           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: ---

Both for the purposes of:
- bug analysis (for the dwz developer)
- bug workaround (for the dwz user)
it would be good to be able to somehow control the optimization level.

So, it would be possible to work around bugs in -O<n> by using -O<n-1>.

A possible optimization level distribution could be:
- O1: read in and write out, no duplicate DIE elimination:=20
  - rewrite .debug_abbrev sections (merging abbreviation tables for differe=
nt
    CUs to eliminate duplicate table entries),
  - use minimal reference encoding (f.i., rewrite DW_FORM_ref8 into
    DW_FORM_ref4)
- O2: eliminate duplicate DIEs intra-CU
- O3: eliminate duplicate DIEs inter-CU

--=20
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