[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):

 It might not be too hard to patch clang to allow another new {{{stdlib}}}
 option, something like {{{-stdlib=libcxx-override}}} say.

 Then we could use that to force linking to a new libc++.dylib that we put
 in some consistent location instead of the one in
 {{{/usr/lib/libc++.dylib}}}.

 We already patch it for {{{macports-libstdc++}}}, and the mechanism is
 pretty similar.

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Ticket URL: <https://trac.macports.org/ticket/62426#comment:6>
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