[MacPorts] #68480: gcc13 upgrade failure with xcode upgrade to 15 on macOS 13.5.2

[MacPorts]

#68480: gcc13 upgrade failure with xcode upgrade to 15 on macOS 13.5.2
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  Reporter:  mu578    |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Not set  |  Milestone:
 Component:  ports    |    Version:  2.8.1
Resolution:           |   Keywords:  ld_classic
      Port:  gcc13    |
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Comment (by ryandesign):

 Please attach the main.log if you'd like us to investigate what went
 wrong.

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Ticket URL: <https://trac.macports.org/ticket/68480#comment:6>
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