[Dwarf-Discuss] Split Dwarf vs. CU DW_AT_ranges / DW_AT_low_pc placement

[Jakub Jelinek]

On Wed, Mar 10, 2021 at 10:07:27PM -0800, David Blaikie wrote:
> On Wed, Mar 10, 2021 at 9:38 PM Jakub Jelinek <jakub at redhat.com> wrote:
> 
> > On Wed, Mar 10, 2021 at 04:12:57PM -0800, David Blaikie via Dwarf-Discuss
> > wrote:
> > > On Wed, Mar 10, 2021 at 4:02 PM Cary Coutant <ccoutant at gmail.com> wrote:
> > >
> > > > > > So in the end the logical thing to do when encountering a
> > > > > > DW_FORM_rnglistx in a split-unit, in order to support everybody, is
> > > > > > probably to go to the .debug_rnglists.dwo section, if there's one,
> > > > > > disregarding the (inherited) DW_AT_rnglists_base.  If there isn't,
> > then
> > > > > > try the linked file's .debug_rnglists section, using
> > > > > > DW_AT_rnglists_base.  If there isn't, then something is malformed.
> > > >
> > > > Looks reasonable to me. I think we need a new issue to clarify this in
> > > > DWARF 6.
> > > >
> > >
> > > Given that DWARFv5 isn't on by default in GCC yet & I think has a few
> > more
> >
> > It is on by default.  But -gstrict-dwarf is not on by default.
> >
> 
> Oh, it is - in a released version of the compiler, or only in development?

Still in development, but the prerelease already widely deployed by multiple
Linux distributions.

> & you're proposing changing the behavior only under -gstrict-dwarf, rather
> than in general? Any particular reason?

Just a typo, sorry, meant -gsplit-dwarf.

	Jakub