[PATCH v2 0/1] s390: Deprecate s390 32-bit target "s390-*"

[Jens Remus]

On 7/6/2026 11:00 AM, Andreas Arnez wrote:
> On Thu, Jul 02 2026, Andreas Krebbel wrote:
>> On 4/23/26 2:00 PM, Jens Remus wrote:
>>> Linux Kernel 6.19 removed s390 32-bit compatibility support. [1]
>>> Glibc 2.43 deprecated s390 32-bit [2] and will remove it with
>>> Glibc 2.44 [3].  GCC 16 will deprecate s390 32-bit (compiler option
>>> -m31) with the intent to remove it in a future release. [4]
>>>
>>> This deprecates s390 32-bit (target "s390-*" and format "elf32-s390")
>>> in the upcoming Binutils and GDB release with the intent to remove it
>>> in a future release.
>>>
>>> s390 32-bit deprecation/removal overview:
>>> - Linux Kernel 6.19 (February 2026) removed s390 32-bit compat
>>> - Glibc 2.43 (January 2026) deprecated s390 32-bit
>>> - GCC 16 (expected April 2026) will deprecate s390 32-bit
>>> - Glibc 2.44 (expected August 2026) will remove s390 32-bit
>>> - Binutils 2.47 (expected August 2026) would deprecate s390 32-bit
>>> - Binutils 2.48 (expected February 2027) would remove s390 32-bit
>>> - GCC 17 (expected April 2027) would remove s390 32-bit
>>>
>>> Removal of s390 32-bit support in Binutils could also be deferred to
>>> Binutils 2.49 (expected August 2027) if that would be preferable, so
>>> that Binutils removes it after GCC.
>> I think would be ok to require GCC users of a deprecated feature to use an
>> older Binutils version.  I'm ok with dropping it with 2.48 already.
>>>
>>> Note that the error is actually not issued during a toplevel configure,
>>> as configure in bfd/ is actually deferred to make.  Should this be
>>> improved, for instance by replicating commit 91fb2a9d47c5 ("Add code to
>>> catch obsolete configurations ...") to configure.ac?
>> I don't think it is worth the trouble for something which will be removed
>> soon anyway.
>>
>> Patch is ok. Thank you, Jens!

...

>>> Changes in v2:
>>> - Add likewise gdb/NEWS entry, as the deprecation/removal in also
>>>    affects GDB.
> 
> This looks OK to me.

...

Andreas², thank you for the review!  Committed to mainline with a
slightly updated commit message, binutils/NEWS, and gdb/NEWS (as
GCC 16.1 has meanwhile been released) for Binutils 2.47 and
next GDB releases.

>>> Feedback is much appreciated!
>>>
>>> [1]: Linux kernel 6.19 commit 8e0b986c59c6 ("s390: Remove compat support"),
>>>       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8e0b986c59c6
>>> [2]: Glibc 2.43 commit 638d437dbf9c ("Deprecate s390-linux-gnu (31bit)"),
>>>       https://sourceware.org/git/glibc.git?a=commitdiff;h=638d437dbf9c
>>> [3]: Glibc 2.44 patch series "[PATCH 0/5] Remove s390-linux-gnu (31bit)",
>>>       https://inbox.sourceware.org/libc-alpha/20260409085102.3475867-1-stli@linux.ibm.com/
>>> [4]: GCC 16 commit 5886bb453a6a ("s390: Deprecate -m31"),
>>>       https://gcc.gnu.org/git/gcc.git?h=5886bb453a6a
>>>
>>> Thanks and regards,
>>> Jens
>>>
>>> Jens Remus (1):
>>>    s390: Deprecate s390 32-bit target "s390-*"
>>>
>>>   bfd/config.bfd |  1 +
>>>   binutils/NEWS  |  8 ++++++++
>>>   gdb/NEWS       | 13 +++++++++++++
>>>   3 files changed, 22 insertions(+)
Regards,
Jens
-- 
Jens Remus
Linux on Z Development (D3303)
jremus@de.ibm.com / jremus@linux.ibm.com

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