Hi, On Thu, 13 Nov 2014, H.J. Lu wrote:
> @GOTPLT will create a PLT entry, but it doesn't mean PLT entry will be > used. Correct. The compiler was supposed to somehow make a good decision (e.g. if there were calls and address-takings in the same unit). > Only @PLTOFF will use PLT entry. Linker should be smart enough to use > only one GOT slot, regardless if @GOTPLT or @GOT is used to take > function address and call via PLT. For @GOT the respective GOT slot needs to resolve to the final address (to provide stable function pointers). For @GOTPLT it could at first resolve to the PLT slot (which would be only a relative reloc, not a symbol based one), like Richard said. So there still would be a difference. Apart from that I agree that the linker should ideally only use one GOT slot, which would remove that particular advantage of @GOTPLT (note that it doesn't do so currently contrary to what you said downthread, I'll respond separately). > I'd like to propose > > 1. Update psABI to remove R_X86_64_GOTPLT64. I don't have much against this, but would like others to say something. Ciao, Michael.
