[Bug 1749261] Re: Add amd64/i386 support

[Steve Beattie]

** Description changed:

  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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https://bugs.launchpad.net/bugs/1749261

Title:
  Add amd64/i386 support

Status in gcc-4.8 package in Ubuntu:
  New
Status in gcc-4.8 source package in Trusty:
  New

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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