[MacPorts] #57883: libcxx @5.0.1_3: error: thread-local storage is unsupported for the current target

[MacPorts]

#57883: libcxx @5.0.1_3: error: thread-local storage is unsupported for the current
target
-------------------------+-------------------------
  Reporter:  ryandesign  |      Owner:  jeremyhu
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  snowleopard
      Port:  libcxx      |
-------------------------+-------------------------

Comment (by ryandesign):

 But you can't use clang 3.5 or later to build libcxx, because clang 3.5
 and later depend on libcxx. Dependency cycle. Why they were blacklisted.

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Ticket URL: <https://trac.macports.org/ticket/57883#comment:5>
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