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Re: more prelink

On Fri, Sep 27, 2002 at 11:39:06PM -0400, Jack Howarth wrote:
> Jakub,
>    I think I have stumbled over another issue with prelink that
> could be problematic unless addressed. Currently the glibc srpms
> are using a postinst script to prelink with the
> --reloc-only flag so it is relinked to the specified base address.
> If I do that on entropy with...
> /usr/sbin/prelink --reloc-only=0x40000 /lib/

I'm terribly sorry to say, but now that I think about it, --reloc-only
for makes no sense on ppc/x86-64/sparc* etc. Sorry for
forgotting about this.
It speeds things up on REL or ELF_MACHINE_REL_RELATIVE arches only.
ELF_MACHINE_REL_RELATIVE are those where R_*_RELATIVE relocs have the
addend in *r_offset. ppc/x86-64/sparc* usually have zero there.
Even if I changed back binutils to put addend to both r_addend and *r_offset
on ppc, ELF_MACHINE_REL_RELATIVE could not be defined because there are
already many -z combreloc binaries and libraries out there I think
and they'd suddenly fail in weird ways.
R_*_RELATIVE relocs can be skipped on the other
arches (ppc, x86-64, sparc*, ...) if the library is prelinked, not
just prelink -r'ed. Then it guarantees *r_offset has the proper value.


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