[MacPorts] #53194: clang: have -stdlib=libstdc++ refer to MacPorts libstdc++

[MacPorts]

#53194: clang: have -stdlib=libstdc++ refer to MacPorts libstdc++
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  Reporter:  MarcusCalhoun-Lopez  |      Owner:  jeremyhu@…
      Type:  enhancement          |     Status:  new
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:
Resolution:                       |   Keywords:  haspatch
      Port:  clang-3.9            |
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Comment (by jeremyhu):

 Approach #2 looks fine.  Go ahead and push it to llvm-devel but don't make
 the variant default.  Let's solicit feedback from macports-dev, and if
 folks find it useful, we should bring it back into llvm-3.9 as well.

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Ticket URL: <https://trac.macports.org/ticket/53194#comment:8>
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