[Bug 1727540] Re: add support for thunderx2 cores

[dann frazier]

** Also affects: gcc-5 (Ubuntu Zesty)
   Importance: Undecided
       Status: New

** Also affects: gcc-5 (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: gcc-5 (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: gcc-5 (Ubuntu Artful)
   Importance: Undecided
       Status: New

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

Title:
  add support for thunderx2 cores

Status in gcc-5 package in Ubuntu:
  New
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:
  New
Status in gcc-5 source package in Bionic:
  New

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 is basically 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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