[MacPorts] #55441: libcxx, libcxxabi: also install into the SDKs

[MacPorts]

#55441: libcxx, libcxxabi: also install into the SDKs
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  Reporter:  ryandesign         |      Owner:  jeremyhu
      Type:  enhancement        |     Status:  new
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:
Resolution:                     |   Keywords:  snowleopard haspatch
      Port:  libcxx, libcxxabi  |
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Comment (by ryandesign):

 But what should we do for the Xcode 3.2.x user on Snow Leopard? Should we
 install libc++ into the 10.5 SDK also, or just into the 10.6 SDK? Will it
 be a problem if we install a libc++ build with
 `MACOSX_DEPLOYMENT_TARGET=10.6` into the 10.5 SDK?

 I guess the simplest would be to just say that attempting to build with
 libc++ on 10.6 using the 10.5 SDK is unsupported, and not install it
 there.

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Ticket URL: <https://trac.macports.org/ticket/55441#comment:5>
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