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Re: Proposal for STT_GNU_IFUNC and R_*_IRELATIVE
On Thu, May 28, 2009 at 7:28 AM, Ulrich Drepper <drepper@redhat.com> wrote:
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> H.J. Lu wrote:
>> for static executables. It is called from elf-init.c. How can I
>> report a bad relocation safetly?
>
> [I assume you meant dl-init.c.]
No, it is in elf-init.c.. The R_*_IRELATIVE relocations are
processed first in __libc_csu_init before preinit_array only
for static executables.
> And for sake of reducing strange effects: it would be best to to handle
> this a bit different. ?Implicitly relying on the programmer having a
> newer glibc installed which using ifunc can cause problems. ?If,
> instead, you write a new code fragment which is placed into the .init
> section (provided by the linker whenever ifunc symbols are used in
> statically linked code), then this new init function could reference a
> function in libc which doesn't exist in older versions.
>
The same can be said for XXX_array. I don't think you will
get an error if you use preinit_array and your glibc doesn't support
it.
--
H.J.