[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:  kencu
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  snowleopard leopard tiger
      Port:  libcxx  |
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Comment (by catap):

 After some time to think: I really love an idea to finish minimal
 bootstrap toolchain: gcc10 (testing right now), cmake (you did it) and
 maybe something else which is required to build some clang which is
 depends on how much additional work it needed.

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Ticket URL: <https://trac.macports.org/ticket/58898#comment:36>
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