[MacPorts] #71942: Make legacy-support library work properly on later OS than build target

[MacPorts]

#71942: Make legacy-support library work properly on later OS than build target
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  Reporter:  fhgwright       |      Owner:  fhgwright
      Type:  enhancement     |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:
      Port:  legacy-support  |
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Comment (by kencu):

 hiding and showing symbols depending on deployment target as per
 https://trac.macports.org/ticket/59135#comment:10 is likely the answer.

 Then you would have one legacysupport library, the same on all systems,
 but with visibility of the symbols in the library dependant on deployment
 target,

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Ticket URL: <https://trac.macports.org/ticket/71942#comment:2>
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