[MacPorts] #71489: qt6-qtbase build fails: detected a std::atomic implementation that fails for function pointers

[MacPorts]

#71489: qt6-qtbase build fails: detected a std::atomic implementation that fails
for function pointers
-------------------------+--------------------
  Reporter:  p-b-west    |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.10.5
Resolution:              |   Keywords:
      Port:  qt6-qtbase  |
-------------------------+--------------------

Comment (by reneeotten):

 looks like you have Xcode 15.1 installed, whereas on the buildbot where is
 appears to work it has Xcode 15.4. Please try updating and see if that
 resolve your problem.

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Ticket URL: <https://trac.macports.org/ticket/71489#comment:1>
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