[MacPorts] #54771: gcc7 -march=native fails on compile for corei7

[MacPorts]

#54771: gcc7 -march=native fails on compile for corei7
----------------------+-------------------
  Reporter:  bdmckay  |      Owner:
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.4.1
Resolution:           |   Keywords:
      Port:  gcc7     |
----------------------+-------------------

Comment (by MarcusCalhoun-Lopez):

 This problem seems to have been reported
 [https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63826 upstream],
 on [https://stackoverflow.com/questions/10327939/error-no-such-
 instruction-while-assembling-project-on-mac-os-x stackoverflow],
 on [https://stackoverflow.com/questions/17126593/compile-errors-with-
 assembler-messages stackoverflow], and on
 [https://stackoverflow.com/questions/9840207/how-to-use-avx-pclmulqdq-on-
 mac-os-x stackoverflow].

 Upstream has a [https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63826
 suggestion] with an
 [https://stackoverflow.com/a/19339845 explanation].

 I do not know if this is something MacPorts can fix on our end, but there
 is at least a fairly easy workaround ({{{-Wa,-q}}}).

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Ticket URL: <https://trac.macports.org/ticket/54771#comment:2>
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