[MacPorts] #70080: Make supported archs none implied by platforms any

[MacPorts]

#70080: Make supported archs none implied by platforms any
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  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  base          |    Version:  2.9.3
Resolution:                |   Keywords:
      Port:                |
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Comment (by barracuda156):

 Replying to [comment:1 ryandesign]:
 > It's trivial to imagine a situation where a noarch port is not the same
 on all platforms. Consider a build system that records the OS name and/or
 version into a text file that gets installed (a script, perhaps).

 But I am talking about an opposite situation: when a port which is same on
 all platforms is still arch-specific?

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Ticket URL: <https://trac.macports.org/ticket/70080#comment:3>
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