[MacPorts] #47904: cmake @3.2.2_0: variants are a confusing mess

[MacPorts]

#47904: cmake @3.2.2_0: variants are a confusing mess
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  Reporter:  larryv@…  |      Owner:  michaelld@…
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.3.3
Resolution:            |   Keywords:
      Port:  cmake     |
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Comment (by michaelld@…):

 I won't disagree, LV. Is the best solution to make variants depend on
 other variants? For example, have +qt4 & +qt5 out there by default &
 neither active by default, and if one of them is selected without +docs
 then require +docs? That seems a little backhanded, but at least honest in
 the variants representation for this port. Once I understand the right
 thing to do, I don't think it'll be difficult doing it.

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Ticket URL: <https://trac.macports.org/ticket/47904#comment:2>
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