[Bug 2064539] Please test proposed package

[Łukasz Zemczak]

Hello Frank, or anyone else affected,

Accepted dpkg into noble-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/dpkg/1.22.6ubuntu6.1
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
noble to verification-done-noble. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-noble. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

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https://bugs.launchpad.net/bugs/2064539

Title:
  Revert back frame pointers for ppc64el (remove -fno-omit-frame-
  pointer)

Status in The Ubuntu-power-systems project:
  New
Status in dpkg package in Ubuntu:
  Fix Released
Status in glibc package in Ubuntu:
  New
Status in linux package in Ubuntu:
  New
Status in dpkg source package in Noble:
  Fix Committed
Status in glibc source package in Noble:
  New
Status in linux source package in Noble:
  New
Status in dpkg source package in Oracular:
  Fix Released
Status in glibc source package in Oracular:
  New
Status in linux source package in Oracular:
  New

Bug description:
  Power's Linux ABIs all require an explicit call chain be stored on the call stack frames which are all accessible via the stack pointer.
  Therefore, having a (soft/simulated) frame pointer does not improve backtraces at all on Power.

  However, forcing a frame pointer via the -fno-omit-frame-pointer option negatively affects performance for multiple reasons: extra prologue/epilogue overhead and fewer shrink-wrapping opportunities.
  Given -fno-omit-frame-pointer does not provide any improvements (backtraces or otherwise) and only reduces performance, -fno-omit-frame-pointers should not be used on Power.

  SRU:

  these changes were implemented during the opening of the oracular
  series. The very same changes are backported to 24.04 LTS. These only
  affect the ppc64el and s390x architectures, for other architectures
  it's a no-change upload.

  We didn't see any fallout for these changes during the development on
  the oracular series, and therefore don't expect any fallout or
  regressions in 24.04 LTS either.

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