[Bug 2067350] [NEW] Removal of 31-bit (s390) glibc packages

[Frank Heimes]

Public bug reported:

Last cycle there was the effort to turn off COMPAT_32BIT_TIME on s390x (but also on other architectures, LP#2038583).
Based on this effort it was agreed to not only turn off 32-bit time but 32-bit (for the mainframe platform, that is technically 31-bit) entirely.

Two major 31-bit “left-overs” for the mainframe platform are the 31-bit
glibc packages (libc6-s390, libc6-dev-s390).

This should be cleaned-up and these should now be removed (and their
build disabled) to reach a clean 64-bit s390x system.

But the reverse dependency situation is like follows:

$ reverse-depends --list libc6-s390 -r oracular -a s390x
gcc-snapshot
lib32asan5
lib32asan6
lib32asan8
lib32atomic1
lib32gcc-s1
lib32gfortran5
lib32go14
lib32go16
lib32go19
lib32go21
lib32go22
lib32go23
lib32gomp1
lib32gphobos1
lib32gphobos2
lib32gphobos3
lib32gphobos4
lib32gphobos5
lib32gphobos76
lib32itm1
lib32objc4
lib32stdc++6
lib32stdc++6-10-dbg
lib32stdc++6-11-dbg
lib32stdc++6-12-dbg
lib32stdc++6-13-dbg
lib32stdc++6-14-dbg
lib32stdc++6-9-dbg
lib32ubsan1
lib32z1
libc6-dev-s390
oaklisp

$ reverse-depends libc6-s390 -r oracular -a s390x
Reverse-Depends
===============
* gcc-snapshot
* lib32asan5
* lib32asan6
* lib32asan8
* lib32atomic1
* lib32gcc-s1
* lib32gfortran5
* lib32go14
* lib32go16
* lib32go19
* lib32go21
* lib32go22
* lib32go23
* lib32gomp1
* lib32gphobos1
* lib32gphobos2
* lib32gphobos3
* lib32gphobos4
* lib32gphobos5
* lib32gphobos76
* lib32itm1
* lib32objc4
* lib32stdc++6
* lib32stdc++6-10-dbg
* lib32stdc++6-11-dbg
* lib32stdc++6-12-dbg
* lib32stdc++6-13-dbg
* lib32stdc++6-14-dbg
* lib32stdc++6-9-dbg
* lib32ubsan1
* lib32z1
* libc6-dev-s390
* oaklisp

But since kernel dropped support for 31-bit (32-bit) executables,
starting with Ubuntu kernel 6.8 (LP#2038583, esp. comment #7 and #11)
these libraries should be removed, too.

** Affects: ubuntu-z-systems
     Importance: Undecided
         Status: New

** Affects: glibc (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: rls-oo-incoming s390 s390x

** Also affects: ubuntu-z-systems
   Importance: Undecided
       Status: New

** Tags added: rls-oo-incoming

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https://bugs.launchpad.net/bugs/2067350

Title:
  Removal of 31-bit (s390) glibc packages

Status in Ubuntu on IBM z Systems:
  New
Status in glibc package in Ubuntu:
  New

Bug description:
  Last cycle there was the effort to turn off COMPAT_32BIT_TIME on s390x (but also on other architectures, LP#2038583).
  Based on this effort it was agreed to not only turn off 32-bit time but 32-bit (for the mainframe platform, that is technically 31-bit) entirely.

  Two major 31-bit “left-overs” for the mainframe platform are the
  31-bit glibc packages (libc6-s390, libc6-dev-s390).

  This should be cleaned-up and these should now be removed (and their
  build disabled) to reach a clean 64-bit s390x system.

  But the reverse dependency situation is like follows:

  $ reverse-depends --list libc6-s390 -r oracular -a s390x
  gcc-snapshot
  lib32asan5
  lib32asan6
  lib32asan8
  lib32atomic1
  lib32gcc-s1
  lib32gfortran5
  lib32go14
  lib32go16
  lib32go19
  lib32go21
  lib32go22
  lib32go23
  lib32gomp1
  lib32gphobos1
  lib32gphobos2
  lib32gphobos3
  lib32gphobos4
  lib32gphobos5
  lib32gphobos76
  lib32itm1
  lib32objc4
  lib32stdc++6
  lib32stdc++6-10-dbg
  lib32stdc++6-11-dbg
  lib32stdc++6-12-dbg
  lib32stdc++6-13-dbg
  lib32stdc++6-14-dbg
  lib32stdc++6-9-dbg
  lib32ubsan1
  lib32z1
  libc6-dev-s390
  oaklisp

  $ reverse-depends libc6-s390 -r oracular -a s390x
  Reverse-Depends
  ===============
  * gcc-snapshot
  * lib32asan5
  * lib32asan6
  * lib32asan8
  * lib32atomic1
  * lib32gcc-s1
  * lib32gfortran5
  * lib32go14
  * lib32go16
  * lib32go19
  * lib32go21
  * lib32go22
  * lib32go23
  * lib32gomp1
  * lib32gphobos1
  * lib32gphobos2
  * lib32gphobos3
  * lib32gphobos4
  * lib32gphobos5
  * lib32gphobos76
  * lib32itm1
  * lib32objc4
  * lib32stdc++6
  * lib32stdc++6-10-dbg
  * lib32stdc++6-11-dbg
  * lib32stdc++6-12-dbg
  * lib32stdc++6-13-dbg
  * lib32stdc++6-14-dbg
  * lib32stdc++6-9-dbg
  * lib32ubsan1
  * lib32z1
  * libc6-dev-s390
  * oaklisp

  But since kernel dropped support for 31-bit (32-bit) executables,
  starting with Ubuntu kernel 6.8 (LP#2038583, esp. comment #7 and #11)
  these libraries should be removed, too.

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