[Bug 1703368] Re: [FFe] [17.10 FEAT] upgrade to newest version of glibc >=2.26

[Steve Langasek]

FFe approved.  autopkgtests and archive rebuild tests give us a good
deal of confidence about the quality of this landing, and we don't want
to wait until 18.04 opens to get 2.26 in to get other feedback up the
stack.

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Title:
  [FFe] [17.10 FEAT] upgrade to newest version of glibc >=2.26

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

Bug description:
  [ Proposal ]
  I'd like to upload glibc 2.26 today (September 5th) and aim to have all the autopkgtest regressions dealt with and the package migrated to the release pocket within a week.

  [ Justification ]
  Ubuntu's glibc is now two upstream revisions behind, and 2.25 and 2.26 brought in a large number of fixes and arch-specific optimizations.  We want both.

  [ Regression Potential ]
  The upstream test suite passes on all of our architectures, and there are not too many changes noted in the upstream changelog that look like they'd cause disruption.  A few obsolete headers have been removed and the like, so keeping an eye on future FTBFSes to potentially deal with that will be needed, but nothing looks hugely impactful.

  [ Original Report ]
  Request to upgrade to newest level of glibc 2.26. which introduced some new features for new machine...
  Currently this version is under development

  https://sourceware.org/glibc/wiki/Release/2.26

  But should be availablle for the 17.10 Release

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