[Bug 1425623] Re: [FFe] update glibc to 2.21 for vivid

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** Branch linked: lp:ubuntu/vivid-proposed/glibc

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https://bugs.launchpad.net/bugs/1425623

Title:
  [FFe] update glibc to 2.21 for vivid

Status in glibc package in Ubuntu:
  Triaged

Bug description:
  glibc 2.21 was released upstream three weeks ago, and is now doing the
  usual stability-commits to the stable branch dance.  The worst of the
  worst bugs are generally found and fixed on the stable branch within
  the first month or two, giving us plenty of time to get a happy glibc
  2.21 for vivid.

  There are a number of features and performance improvements in 2.20
  and 2.21 that we (and customers) want which would be prohibitively
  time-consuming to backport, as well as being error-prone if we did,
  since they'd be tested only in Ubuntu, rather than by all Linux
  distros.

  Also, speaking of backports, moving to 2.21 allows us to drop the
  (massive) IBM branch patch that we're carrying, as all of IBM's
  changes are now upstream.

  glibc, of course, promises and delivers a stable ABI with every new
  version, so there are not any transitions to be had, nor any
  predictions of compatibility issues (any of which would be bugs, not
  features)

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