On 14.04.5 with gcc-4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.4) 4.8.4
Still waiting for the update ...

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  Add amd64/i386 retpoline support

Status in gcc-4.8 package in Ubuntu:
Status in gcc-4.8 source package in Trusty:
  Fix Released

Bug description:
  To mitigate Spectre Variant 2, gcc needs to have retpoline support
  (-mindirect-branch and -mfunction-return arguments on amd64 and i386).

  Packages with this will go into the proposed pockets but need to be
  published in the -security pockets for their respective releases.

  Patches for gcc-4.8 were pulled from H.J. Lu's backport branch to 4.9,
  available at https://github.com/hjl-tools/gcc/tree/hjl/indirect/gcc-
  4_9-branch/master . Upstream GCC does not seem to be applying patches
  to anything older than the gcc-6-branch. H.J. Lu is the author of the
  upstream retpoline commits as well.

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