[MacPorts] #51643: qt5 portgroup overwrites supported_archs, defines universal variant when one is not desired

[MacPorts]

#51643: qt5 portgroup overwrites supported_archs, defines universal variant when
one is not desired
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  Reporter:  ryandesign@…  |      Owner:  mcalhoun@…
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.3.4
Resolution:                |   Keywords:
      Port:  qt5           |
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Comment (by rjvbertin@…):

 > qt5 portgroup which includes the muniversal portgroup which defines a
 universal variant.

 This is always the case because a universal Qt5 build can only be
 generated that way. Should one avoid loading it multiple times?

 Regardless of that, wouldn't it be simpler just to check `supported_archs`
 for the presence of archs other than i386 or x86_64 and raise an error in
 that case?

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Ticket URL: <https://trac.macports.org/ticket/51643#comment:4>
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