[MacPorts] #62329: clang-11: targeted OS version does not support -reexported_symbols_list on 10.6

[MacPorts]

#62329: clang-11: targeted OS version does not support -reexported_symbols_list on
10.6
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  Reporter:  mojca     |      Owner:  kencu
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  clang-11  |
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Comment (by kencu):

 In our libcxx Port, the buildit script sets slightly different linker
 options for 10.7+ vs 10.6 and less:

 <https://github.com/macports/macports-
 ports/blob/edaa2043d3962512d250c12fdd1559b35341e382/lang/libcxx/files/1001
 -Revert-Remove-the-buildit-and-testit-scripts-they-ha.patch#L78>

 we'll have to duplicate that logic if we want to build libc++ on < 10.7
 using the llvm's cmake logic instead of the buildit script.

-- 
Ticket URL: <https://trac.macports.org/ticket/62329#comment:6>
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