[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:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  libcxx       |
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Comment (by kencu):

 So -- at least in this minimal proof-of-concept, it is possible to build
 software that uses new libc++ features on older systems (Mojave in this
 case), without replacing the system libc++.dylib, and this software can
 work.

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Ticket URL: <https://trac.macports.org/ticket/62426#comment:3>
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