[MacPorts] #64639: How to build libcxx on 10.5.8?

[MacPorts]

#64639: How to build libcxx on 10.5.8?
------------------------------+--------------------
 Reporter:  barracuda156      |      Owner:  (none)
     Type:  defect            |     Status:  new
 Priority:  Normal            |  Milestone:
Component:  ports             |    Version:  2.7.1
 Keywords:  powerpc, leopard  |       Port:  libcxx
------------------------------+--------------------
 Trying to build with `sudo port -v install libcxx  configure.compiler
 =macports-gcc-7 supported_archs="ppc ppc64"` fails with:

 {{{
 g++-mp-7: error: unrecognized command line option '-stdlib=libc++'
 g++-mp-7: error: unrecognized command line option '-Wmismatched-tags'
 g++-mp-7: error: unrecognized command line option '-Wshorten-64-to-32'
 g++-mp-7: error: unrecognized command line option '-Wnewline-eof'
 }}}

 I need `libcxx` in order to build `mrustc`.

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Ticket URL: <https://trac.macports.org/ticket/64639>
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