[MacPorts] #64572: llvm-3.4: Circular dependencies / dependency cycle

[MacPorts]

#64572: llvm-3.4: Circular dependencies / dependency cycle
-------------------------+----------------------
 Reporter:  ryandesign   |      Owner:  (none)
     Type:  defect       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.7.1
 Keywords:  snowleopard  |       Port:  llvm-3.4
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 A dependency cycle exists involving llvm-3.4 on Mac OS X 10.6 again. Some
 dependency of llvm-3.4 depends on clang-3.4.

 Consequence: When I try to upgrade outdated ports, clang-3.4 gets built
 before llvm-3.4, which crashes because the outdated llvm-3.4 is linked
 with an old libffi.dylib which no longer exists.

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Ticket URL: <https://trac.macports.org/ticket/64572>
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