[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 fhgwright):

 This isn't about having a one-size-fits-all library; it's just about being
 able to do the right thing if it finds itself running on a later OS than
 it was built for.  As I mentioned before, this is far more likely to be an
 issue with the static library, where the magic-symbol approach won't work,
 anyway.

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Ticket URL: <https://trac.macports.org/ticket/71942#comment:3>
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