[patch] dwarf2out: Drop the size + performance overhead of DW_AT_sibling
Mon Oct 17 09:44:00 GMT 2011
On Oct 14, 2011, at 4:02 PM, Tom Tromey wrote:
>>>>>> "Tristan" == Tristan Gingold <email@example.com> writes:
> Tristan> I am not against this patch, my only concern is that there are many
> Tristan> many dwarf consumers and I have no idea how they will react to this
> Tristan> change.
> I tend to think that this is the wrong standard to apply. In this case
> we would be avoiding a beneficial change -- as measured in both
> performance in a couple of cases, and in size --
I am not against this patch. I think it would be useful to add an option (-fdwarf-emit-sibling ?) to keep the old behavior.
> for the sake of unknown
> and possibly nonexistent consumers. I think instead the burden of proof
> should be on those consumers, both to give their evidence and reasoning
> and to engage with GCC.
You know the story here: they don't use the latest gcc version and start to complain years later.
> Another way to look at it is that there have been many changes to GCC's
> DWARF output in the last few years. Surely these have broken these
> DWARF consumers more than this change possibly could.
Yes, but there is -gstrict-dwarf to stay compatible with old behavior.
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