[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 kencu):

 the {{{port selecr}}} mechanism should take care of the symlinks for you.

 There are times when I would like the current version of {{{gas}}} on mac
 (the clang assembler is broken on PPC, and the old {{{as}}} doesn't
 understand newer instruction sets.

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Ticket URL: <https://trac.macports.org/ticket/54771#comment:5>
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