[Bug 1727540] Re: add support for thunderx2 cores

[dann frazier]

** Attachment added: "gcc-5.debdiff.xenial"
   https://bugs.launchpad.net/ubuntu/+source/gcc-5/+bug/1727540/+attachment/4998136/+files/gcc-5.debdiff.xenial

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

Title:
  add support for thunderx2 cores

Status in gcc-5 package in Ubuntu:
  In Progress
Status in gcc-5 source package in Xenial:
  New
Status in gcc-5 source package in Zesty:
  New
Status in gcc-5 source package in Artful:
  In Progress
Status in gcc-5 source package in Bionic:
  In Progress

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>
   ^

  [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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