Deprecation of s390-32 in glibc

[Stefan Liebler]

On 12/2/25 13:07, Florian Weimer wrote:
> * Stefan Liebler:
> 
>> The next linux kernel 6.19 is about to remove support for s390-32
>> compat layer.
> 
>> Until the code is removed, we of course can also remove
>> "s390-linux-gnu" from build-many-glibcs.py script as newer
>> kernel-versions don't have the proper syscall-numbers in unistd.h and
>> "build-many-glibcs.py update-syscalls" would either fail or would even
>> use the syscall numbers from s390-64.
> 
> Is the plan is to remove s390-linux-gnu from build-many-glibcs.py before
> we switch the script to Linux 6.19?
Linux 6.18 still fully support the s390 compat layer. Yes, I think we
should remove s390-linux-gnu from build-many-glibcs.py before/with
switching to Linux 6.19. Then the glibc internal syscall numbers for
s390-32 are frozen and won't be updated anymore with "update-syscalls".>
> But keep the s390-32 subdirectories in the glibc for the time being,
> and delete them only at a later stage (presumably in 2027 or even later)?Yes, the s390-32 code is kept in the tree. This allows to build/test
glibc with Linux <=6.18 as long as gcc is also able to build s390-32
code. As mentioned the glibc 2.45 release (expected February 2027) will
be the first glibc release without s390-32 support and the s390-32
subdirectories will be removed before this release.>
> Thanks,
> Florian
>