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

[MacPorts]

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

 See also #54773 .

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Ticket URL: <https://trac.macports.org/ticket/54771#comment:4>
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