[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 kencu):

 The following bug report looks relevant.

 <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81037>

 The patches do not appear to have been backported before gcc5.

 Try gcc5, gcc6, or gcc7 instead? Otherwise if gcc49 is mandatory, you
 might need to try to backport the fixes into the gcc49 codebase.

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Ticket URL: <https://trac.macports.org/ticket/56511#comment:1>
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