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[Launchpad Bug Tracker <1727540@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package gcc-5 - 5.5.0-1ubuntu2

---------------
gcc-5 (5.5.0-1ubuntu2) artful; urgency=medium

  * Add thunderx2 support. LP: #1727540.

 -- dann frazier <dannf@xxxxxxxxxx>  Fri, 12 Jan 2018 17:00:22 -0700

** Changed in: gcc-5 (Ubuntu Artful)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1727540

Title:
  add support for thunderx2 cores

Status in gcc-5 package in Ubuntu:
  Fix Released
Status in gcc-5 source package in Xenial:
  Fix Committed
Status in gcc-5 source package in Zesty:
  Won't Fix
Status in gcc-5 source package in Artful:
  Fix Released
Status in gcc-5 source package in Bionic:
  Fix Released

Bug description:
  [Impact]
  gcc-5 doesn't know about thunderx2 cores, so optimization flags for this target will fail. While it is possible to generate the same code by referencing the previous name of the core (vulcan), that is non-obvious to the end user.

  [Test Case]
  gcc-5 hello.c -o hello -mcpu=thunderx2t99
  hello.c:1:0: error: unknown value ‘thunderx2t99’ for -mcpu
   #include <stdio.h>
   ^

  Also test that -mcpu=vulcan still works, to check for regressions.

  [Regression Risk]
  The patchset includes a rename of the "vulcan" core to "thunderx2t99". It retains backwards compatibility with the "vulcan" name to avoid regressing users that may already be using that name.

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