[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):

 Oh, I'm perfectly happy maintaining this patch as part of clang-3.9+.

 > Unfortunately, for my purposes (#53330), the variant must be default

 Ok.  Let's make it default then on clang-4.0 and clang-devel.  If there's
 not much resistance, we can remove it as a variant entirely in the future.
 Sound good?

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Ticket URL: <https://trac.macports.org/ticket/53194#comment:16>
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