Re: s390x: removal of 31-bit libraries

Hi,

On 2026-04-28 10:22, Sebastian Ramacher wrote:
> Hi
> 
> On 2025-12-29 13:12:48 +0100, Aurelien Jarno wrote:
> > Hi,
> > 
> > Linux 6.19 will drop support for 31-bit compatibility on s390x, and will 
> > also stop providing 31-bit support in UAPI header files [1]. Once this 
> > lands in unstable, it will become impossible to build the libc6-s390 and 
> > libc6-dev-s390 packages on s390x. We should therefore stop building 
> > these packages, as well as g++-15-multilib and the corresponding lib32* 
> > libraries.
> > 
> > Doing so will break many packages. I therefore suggest that, over the 
> > next few weeks, we start removing 31-bit support in all packages except 
> > src:gcc-15, src:gcc-defaults, src:glibc, src:linux and src:zlib (and 
> > possibly the corresponding cross compilers?). Then in a final 
> > coordinated step, we can fully drop 31-bit support from those remaining 
> > packages as well.
> > 
> > Any thoughts about that? Volunteers to coordinate this? 
> 
> If I am reading dak output correctly, we are down to gcc-11, gcc-13,
> gcc-14, gcc-15, zlib, and glibc itself. So assuming that I didn't miss
> anything, are we there to also drop the support from these packages?

These packages have already been fixed, but they are kept as cruft in 
sid (but not in forky). I have not investigated why, it could just be 
that dak is not smart enough.

In addition llvm-toolchain-{14,19,20} are still waiting for a fix [1], 
but they are only in sid or experimental.

Regards
Aurelien

[1] https://bugs.debian.org/cgi-bin/pkgreport.cgi?tag=31-bit-removal;[email protected]