Hi,
On 2021-07-15 11:11, Michael Hudson-Doyle wrote:
> Hi,
>
> I know it won't be relevant to Debian for a while, but we're planning to
> upload to the upcoming glibc 2.34 release in Ubuntu fairly soon and I want
> to make sure we adapt to an upstream way in a way that is aligned with any
> plans for Debian.
>
> The issue is this: 2.33 and previous releases install the dynamic linker
> and libc as files with names like ld-${GLIBC_VERSION}.so and
> libc-${GLIBC_VERSION}.so and makes symlinks from the SONAME to these files
> (for example ld-linux-x86-64.so.2 -> ld-2.31.so, libc.so.6 -> libc-2.31.so).
> 2.34 and later will just install the libraries directly to the SONAME
> location.
>
> There is another wrinkle of course in that Debian/Ubuntu install these
> files to /lib/$multiarch/, not /lib or /lib64 as upstream expects.
>
> What I've implemented[0] for Ubuntu (only for testing so far) is to install
> libc to /lib/$multiarch/libc.so.6, the dynamic linker to
> /lib/$multiarch/$dynamic_linker_soname, and then have a symlink from the
> ABI-mandated dynamic linker path to the new path for the dynamic linker.
> This feels like a reasonable compromise between the upstream changes and
> what Debian does to me but I'm certainly interested in hearing other
> opinions (ideally before Ubuntu feature freeze :-p).
I think all the issues above are not really due to multiarch, but are
created by the local-rtlddir-cross.diff patch that we have dropped in
Debian as it introduces many issues. This makes the cross-toolchain-base
maintainer unhappy, but I do not think we should introduce complexity in
the libc6 package just to make dpkg-cross simpler.
We dropped this patch in Ubuntu a while ago too.
With that patch dropped, there is no symlink to add, you can just use
the upstream makefile do their jobs. The dynamic linker is installed
directly in the ABI-mandated dynamic linker and there is no need for
symlinks.
That would be simpler, indeed, and I can't really think of any particular downsides. The only changes 2.34 will require then are the changes around fixperms.
Cheers,
mwh