[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
----------------------+----------------------
  Reporter:  kencu    |      Owner:  jeremyhu
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  cctools  |
----------------------+----------------------

Comment (by mouse07410):

 > Xcode’s clang is already part of the check. Nothing needs to change in
 this regard

 It was my impression that by default it would pick a Macports clang, or
 even install it (I'm not sure which Macports component does it though). So
 if by default Xcode clang would be used when present - I'm happy, and
 nothing needs to change in this regard.

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Ticket URL: <https://trac.macports.org/ticket/58493#comment:31>
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