[MacPorts] #58898: libcxx bootstrapping needs a method to upgrade to the +emulatedtls variant on 10.6 and less

[MacPorts]

#58898: libcxx bootstrapping needs a method to upgrade to the +emulatedtls variant
on 10.6 and less
---------------------+---------------------------------------
  Reporter:  kencu   |      Owner:  jeremyhu
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  snowleopard leopard tiger
      Port:  libcxx  |
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Comment (by cjones051073):

 b.t.w. you say clang-3.4 does not itself depend on libcxx. But, something
 in the dep tree must be the thing that first triggers its installation ?
 Could you not then make that depend on `path:lib/something.dylib:libcxx-
 bootstrap` ?

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Ticket URL: <https://trac.macports.org/ticket/58898#comment:15>
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