[MacPorts] #57576: libcxx 8+ usability

[MacPorts]

#57576: libcxx 8+ usability
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  Reporter:  RJVB         |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  libcxx       |
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Comment (by kencu):

 There is a {{{LIBCXX_HIDE_FROM_ABI_PER_TU_BY_DEFAULT}}} setting that can
 be used when libcxx is built that hopefully changes the default behaviour,
 as it promises to do.

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Ticket URL: <https://trac.macports.org/ticket/57576#comment:9>
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