[MacPorts] #55136: sudo port -d upgrade outdated hangs

[MacPorts]

#55136: sudo port -d upgrade outdated hangs
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  Reporter:  micrology  |      Owner:
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  base       |    Version:  2.4.2
Resolution:             |   Keywords:
      Port:             |
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Comment (by raimue):

 We had similar reports like this for old macOS versions including 10.10
 Yosemite, for example: #45609 or #49647. It appears to be a bug in the
 Xcode toolchain, but we were never able to pinpoint the problem. As a
 first try, reboot your system.

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Ticket URL: <https://trac.macports.org/ticket/55136#comment:4>
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