[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@…):

 True, `libc++` comes with the system.

 But
 {{{
 clang++-mp-3.4 -stdlib=libc++ test.cxx -o test
 }}}
 works for me. And it links to the same stdlib:
 {{{
 > otool -L test
 test:
         /usr/lib/libc++.1.dylib (compatibility version 1.0.0, current
 version 28.4.0)
         /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
 version 159.1.0)
 }}}

 See [[XcodeVersionInfo]].

-- 
Ticket URL: <https://trac.macports.org/ticket/44129#comment:20>
MacPorts <https://www.macports.org/>
Ports system for OS X