Re: [PATCH] Fix glibc 2.34 ABI omission (missing GLIBC_2.34 in dynamic loader)

["H.J. Lu" <hjl.tools@gmail.com>]

On Wed, Dec 8, 2021 at 2:29 AM Florian Weimer via Libc-alpha
<libc-alpha@sourceware.org> wrote:
>
> * Andreas Schwab:
>
> > On Dez 08 2021, Florian Weimer wrote:
> >
> >> * Andreas Schwab:
> >>
> >>> On Dez 08 2021, Florian Weimer via Libc-alpha wrote:
> >>>
> >>>> The glibc 2.34 release really should have added a GLIBC_2.34
> >>>> symbol to the dynamic loader.
> >>>
> >>> Well, the ship has sailed.
> >>
> >> Has it?  It's just software, we can change it.
> >
> > ABI is not software, it's a contract.
>
> But sometimes we have to to fix bugs.  Again, what I propose is quite
> different from a simple symbol change because distributions and users
> can fix this now, well before the symbol is going to be used.

I think we should do it and ask distributions to backport the patch.

> I have considered using a stub DSO and mention that instead of libc.so.6
> in the libc.so linker script.  But I'm not sure how we can prevent users
> from linking against the moved symbol by bypassing the linker script.
> That would produce ABI-incompatible binaries.  We could turn it into a
> compat symbol, but as long as it's in the dynamic symbol table, some
> people will use it.
>
> Thanks,
> Florian
>


-- 
H.J.