Re: --gc-section leftovers workaround.

[Pedro Alves <pedro@codesourcery.com>]

On Wednesday 28 October 2009 19:23:11, Paul Pluzhnikov wrote:
> On Wed, Oct 28, 2009 at 11:51 AM, Pedro Alves <pedro@codesourcery.com> wrote:
> 
> > With --gc-sections, gnu ld zeros out the start addresses of
> > unreferences FDEs, but leaves them behind.
> 
> I believe the same thing happens when there are multiple instances of the
> same inline function in several translation units: one is selected, and
> debug info for the other ones gets zero start address.

Ah.

> The patch looks good to me.

It wasn't unfortunately.  :-( I had posted an early patch
that got one thing wrong.  It compared FDE->initial_location to
(FDE+1)->initial_location, to check for overlap, and discarded
FDE if so.  But, this isn't correct since FDE may be the valid one
we should keep, and (FDE+1)->initial_location could be 0!  The
corrected patch first looks for the first FDE with
initial_location != 0 and uses that one for overlap and discarding
decisions.  Anyway, I think that patch is itself clearer than I
can manage to explain it.  :-)

-- 
Pedro Alves