* Bastien ROUCARIES: > On Mon, Oct 3, 2011 at 3:02 PM, Florian Weimer <f...@deneb.enyo.de> 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 >> today). > > 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. -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/87vcs6drx9....@mid.deneb.enyo.de
