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

[MacPorts]

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

Comment (by mojca@…):

 Michael, I assigned the ticket to you now that you are the one that's
 actively maintaining the port.

 I only experienced the problem and tested on 10.7, but maybe someone
 should check what's going on with 10.6 and 10.8 as well.

 The following patch should work on 10.7:
 {{{
 if {${configure.cxx_stdlib} eq "libc++"} {
     compiler.blacklist-append *gcc* {clang < 500} macports-clang-2.9
 macports-clang-3.0 macports-clang-3.1 macports-clang-3.2 macports-
 clang-3.3
 }
 }}}
 Whether or not this should be inside a ```"platform darwin 11"``` block, I
 have no idea.

-- 
Ticket URL: <https://trac.macports.org/ticket/44129#comment:11>
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