[MacPorts] #58493: cctools: using clang < 5.0 as default assembler generates assembly errors in some cases

[MacPorts]

#58493: cctools: using clang < 5.0 as default assembler generates assembly errors
in some cases
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  Reporter:  kencu    |      Owner:  jeremyhu
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  cctools  |
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Comment (by kencu):

 I think we'd have bootstrap loop.

 We can't get to llvm-5.0 without clang/llvm-3.4, and we can't get to
 clang/llvm-3.4 without cctools being upgraded.

 I am thinking the best idea would be to allow mp-clang as assembler if
 llvm >= 5.0, and use the system clang only if xcode >= 7.3.1.

 I'm hoping to come up with an easy tweak to the current cctools Portfile
 that would enable that idea...

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Ticket URL: <https://trac.macports.org/ticket/58493#comment:3>
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