[MacPorts] #59835: cmake: strange libc++ "if" condition

[MacPorts]

#59835: cmake: strange libc++ "if" condition
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  Reporter:  michaelld  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  cmake      |
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Comment (by michaelld):

 But I'm also wondering whether this is required at all for, say, 10.14 or
 10.15? Isn't using `libc++` for the `cxx_stdlib` already the default for
 those OSX versions? How far back does this requirement stand? I'm guessing
 it doesn't hurt to re-require using `libc++`, but maybe it's not truly
 necessary for 10.8+ or 10.9+ since it's already the default for those OSX
 versions?

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Ticket URL: <https://trac.macports.org/ticket/59835#comment:5>
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