[MacPorts] #39975: root: Add --enable-cxx11 when using libc++

[MacPorts]

#39975: root: Add --enable-cxx11 when using libc++
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  Reporter:  jfcaron@…    |      Owner:  jeremyhu@…
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.2.0
Resolution:               |   Keywords:
      Port:  root         |
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Comment (by jonesc@…):

 Ok thanks. So for the current macports release, we should just enable it
 by default for osx 10.9, and then when the support in base is released, i
 can switch to the better test.  I'll try and get around to adding this
 next week.

 Cheers chris

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Ticket URL: <https://trac.macports.org/ticket/39975#comment:15>
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