[MacPorts] #56042: Bundle libc++ with MacPorts on 10.6

[MacPorts]

#56042: Bundle libc++ with MacPorts on 10.6
-------------------------+-----------------
 Reporter:  ryandesign   |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  base         |    Version:
 Keywords:  snowleopard  |       Port:
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 We want to switch the default `cxx_stdlib` for 10.6-10.8 from libstdc++ to
 libc++. 10.7 and later ship with libc++, but 10.6 doesn't.
 [wiki:LibcxxOnOlderSystems#LeopardandSnowLeopardIntel Bootstrapping this
 system to libc++] is complicated by this fact. We might be able to solve a
 lot of those bootstrapping problems by having MacPorts base install libc++
 as well on 10.6 only.

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Ticket URL: <https://trac.macports.org/ticket/56042>
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