[MacPorts] #54215: gcc7: broken on powerpc

[MacPorts]

#54215: gcc7: broken on powerpc
---------------------+-----------------
  Reporter:  mojca   |      Owner:
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  gcc7    |
---------------------+-----------------

Comment (by ccorn):

 This now applies to the gcc7 port as well as its libgcc subport, as
 introduced in [https://github.com/macports/macports-
 ports/commit/ff4c4bd6219f166b85c82c44eecb909dd3ae08b3 MacPorts commit
 ff4c4bd].

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Ticket URL: <https://trac.macports.org/ticket/54215#comment:3>
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