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[Launchpad Bug Tracker <1807448@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package binutils - 2.26.1-1ubuntu1~16.04.8

---------------
binutils (2.26.1-1ubuntu1~16.04.8) xenial; urgency=medium

  * power9-001.diff: Drop this patch as it breaks IFUNC on ELFv1 (LP:
#1807448)

 -- Adam Conrad <adconrad@xxxxxxxxxx>  Fri, 07 Dec 2018 12:49:49 -0700

** Changed in: binutils (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1807448

Title:
  [SRU] Patch power9-001.diff breaks IFUNC on ELFv1

Status in binutils package in Ubuntu:
  Invalid
Status in binutils source package in Xenial:
  Fix Released

Bug description:
  [ SRU Justification ]
  As per comment #4 in https://bugs.launchpad.net/ubuntu/+source/binutils/+bug/1655181 the undefined weak fix should not have been backported because it breaks IFUNC on ELFv1, and can't be fixed without a much larger backport from 2.27.  This patch breaks glibc builds on PPC64 ELFv1.

  See also https://sourceware.org/bugzilla/show_bug.cgi?id=20472

  I will be pushing this upload via the ubuntu-security-proposed PPA, as
  this regression also exists in security and if we ever want to do a
  glibc security update, we need the fix there as well.

  [ Test Case ]
  See that glibc now builds on powerpc in xenial, when it didn't with the previous version.

  [ Regression Potential ]
  We lived fine without this patch before, and will do again in the future.  Removing it fixes ELFv1 glibc builds (and presumably anything else that uses IFUNC), but should have no other obvious impact.

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