[Bug default/27561] New: low-mem odr

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27561

            Bug ID: 27561
           Summary: low-mem odr
           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: ---

Atm odr is disabled in low-mem mode, here in set_die_odr_state:
...
  if (low_mem)                                                                  
    /* Todo: allow low-mem mode.  */                                            
    return;                                                                    
             ...

In principle, we could enable this.

When doing the enable-and-see-what-breaks approach, we get a few easy things to
fix.  Using --devel-verify-dups also helps.  But after that, we run into harder
problems.

ISTM that enabling this only makes sense in a setup where all accesses of
struct dw_die fields after die_parent (so, the ones that are conditionally
available) can be (optionally) instrumented such that it's checked whether the
field is indeed available.

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