[MacPorts] #56511: gcc49 @4.9.4_2: rev-upgrade rebuild fails on macOS 10.12.6 XCode 9.2

[MacPorts]

#56511: gcc49 @4.9.4_2: rev-upgrade rebuild fails on macOS 10.12.6 XCode 9.2
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  Reporter:  mopihopi  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  gcc49     |
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Comment (by jmroot):

 Interestingly, this seems to affect gcc49 only, i.e. gcc48 and older built
 OK (and of course gcc5 and later are also fine).

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Ticket URL: <https://trac.macports.org/ticket/56511#comment:6>
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