[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 macports-libcxx  |
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Comment (by kencu):

 As an example, it was more than a decade before ODR violations showed up
 when mixing libstdc++.dylib from gcc, although they eventually did (Iain
 has figured out how to fix that for libstdc++.dylib he tells me, by the
 way).

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Ticket URL: <https://trac.macports.org/ticket/62426#comment:33>
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