[MacPorts] #62426: libc++: using a newer libc++ to build software on older macos systems

[MacPorts]

#62426: libc++: using a newer libc++ to build software on older macos systems
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  Reporter:  kencu                   |      Owner:  kencu
      Type:  enhancement             |     Status:  closed
  Priority:  Normal                  |  Milestone:
 Component:  ports                   |    Version:
Resolution:  fixed                   |   Keywords:
      Port:  libcxx macports-libcxx  |
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Comment (by kencu):

 Although this example with the llvm libraries demonstrates the issue,
 probably by using the newest/greatest,  I believe a similar thing can
 happen with any software.

 BTW, I'm sure you know, up until I changed it, the clang-N ports just
 ditto copied the new headers from libc++. I removed that when I started
 installing libc++ instead. So all macports-clang-N installations always
 use the headers that match that libc++ version:

 https://github.com/macports/macports-
 ports/blob/d08617c395900282d3034185baf81987a9954e59/lang/llvm-9.0/Portfile#L597

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Ticket URL: <https://trac.macports.org/ticket/62426#comment:72>
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