[MacPorts] #53605: get GCC to use libc++?

[MacPorts]

#53605: get GCC to use libc++?
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  Reporter:  RJVB       |      Owner:
      Type:  request    |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  gcc6 gcc7  |
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Comment (by RJVB):

 Can we please keep this ticket dedicated to using GCC with libc++,
 regardless of whether that library is a standard system library or not?

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Ticket URL: <https://trac.macports.org/ticket/53605#comment:2>
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