[Bug 2126577] Re: [26.04 FEAT] Set Architecture Level (ALS) to z15

[Richard Scott McNew]

I have a change for dpkg to set the default RUSTFLAGS for z15:

https://launchpad.net/~richard-scott-
mcnew/+archive/ubuntu/dpkg-s390x-z15-min-arch

I have tested it on a s390x porter box and it seems to work:

ubuntu at richard-scott-mc-test-dpkg-s390x:~$ ls -la ripgrep-orig/usr/bin/rg 
-rwxr-xr-x 1 ubuntu ubuntu 5911368 Sep 18  2024 ripgrep-orig/usr/bin/rg

ubuntu at richard-scott-mc-test-dpkg-s390x:~$ ls -la ripgrep/usr/bin/rg 
-rwxr-xr-x 1 ubuntu ubuntu 5870408 Sep 18  2024 ripgrep/usr/bin/rg

ubuntu at richard-scott-mc-test-dpkg-s390x:~$ file ripgrep-orig/usr/bin/rg 
ripgrep-orig/usr/bin/rg: ELF 64-bit MSB pie executable, IBM S/390, version 1 (SYSV), dynamically linked, interpreter /lib/ld64.so.1, BuildID[sha1]=0a949d2350cd0f49646d0306cb46bf75adf8d96f, for GNU/Linux 3.2.0, stripped

ubuntu at richard-scott-mc-test-dpkg-s390x:~$ file ripgrep/usr/bin/rg 
ripgrep/usr/bin/rg: ELF 64-bit MSB pie executable, IBM S/390, version 1 (SYSV), dynamically linked, interpreter /lib/ld64.so.1, BuildID[sha1]=b25448dd41ad11ddb13184c4832adb390adb4437, for GNU/Linux 3.2.0, stripped

Can someone verify and sponsor the upload for Resolute?

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https://bugs.launchpad.net/bugs/2126577

Title:
  [26.04 FEAT] Set Architecture Level (ALS) to z15

Status in Ubuntu on IBM z Systems:
  Fix Committed
Status in gcc-15 package in Ubuntu:
  Fix Released
Status in linux package in Ubuntu:
  Fix Committed
Status in llvm-toolchain-20 package in Ubuntu:
  Fix Released
Status in llvm-toolchain-21 package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  The IBM Z team requests to raise the architectural level set (ALS) for Ubuntu on IBM Z and LinuxONE (s390x) to z15, optimized for z16.
  For the gcc-15 compiler (and with that for user space) that would be in debian/rules2:
  march=z15
  mtune=z16
  For now gcc-15 (15.2) is the default in resolute.

  For the kernel that would be:
  debian.master/config/annotations
   CONFIG_MARCH_Z15                                policy<{'s390x': 'y'}>
   CONFIG_TUNE_Z16                                 policy<{'s390x': 'y'}>

  Changes in llvm are reflected in debian/rules like:
   # Change the default CPU for s390x
   ZARCH=z196
   ifeq ($(DERIVATIVE),Ubuntu)
    ifneq (,$(filter $(DISTRO), xenial bionic focal jammy noble plucky questing))
      ZARCH=z13
    else
      ZARCH=z15
    endif
   endif

  Also check the 'UTAH' based (ISO) image testing (QA Tracker).
  (Is the underlying system capable to execute the newly build binaries?).

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