Re: Bits from dpkg developers - dpkg 1.16.1
* Bastien ROUCARIES:
> On Mon, Oct 3, 2011 at 3:02 PM, Florian Weimer <firstname.lastname@example.org> wrote:
>> * Adam Borowski:
>>>> I would defend static libs for scientific apps. Static libs show a
>>>> significant performance benefit (2-40%, median around 5-10% but sometimes
>>>> far more with C++ apps) and so are standard in HPC still;
>>> If you see that big a difference, you do a lot of cross-file calls in
>>> tight loops.
>> Not necessarily. -fPIC and -fPIE force calls to global functions
>> defined in the same translation unit to go through the PLT. They
>> aren't translated to direct IP-relative calls. For -fPIC, this is
>> required by the ELF specification (no kidding, this might seem strange
> Could we add a gcc flag and be non conformant ?
I'm not sure if this is worth the deviation from upstream. If we want
to break ABI, there far better options.
> I suppose it is only for using LD_PRELOAD.
Not sure. LD_PRELOAD still works for cross-library calls, but it
would cease to redirect library-internal calls. I really don't know
why ELF does this.