[MacPorts] #44129: cmake: fix build against libc++ on Lion

[MacPorts]

#44129: cmake: fix build against libc++ on Lion
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  Reporter:  mojca@…  |      Owner:  michaelld@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:  lion
      Port:  cmake    |
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Comment (by michaelld@…):

 larryv: If you compile the attached .cc file on your 10.7 VM using the
 script embedded in it, then execute the resulting executable, what does it
 print? If you don't have "libcxx +replacemnt_libcxx" installed, then
 you're using the Xcode libc++, which version is < 500 and hence should
 have the issue reported here & the script should print "libc++ is NOT OK:
 is.gcount() == 11".

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Ticket URL: <https://trac.macports.org/ticket/44129#comment:25>
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