[MacPorts] #56996: libgcc45 @4.5.4_15: error: non-local symbol required in directive

[MacPorts]

#56996: libgcc45 @4.5.4_15: error: non-local symbol required in directive
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  Reporter:  mopihopi  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  sierra
      Port:  libgcc45  |
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Comment (by kencu):

 It's also possible to have two versions of Xcode installed on your system.
 You can select one or the other. It takes some "keeping things straight",
 but I've done it for many years.

 That way you can use Xcode 9 most of the time, and just use Xcode 8 to
 build gcc47.

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Ticket URL: <https://trac.macports.org/ticket/56996#comment:19>
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