[MacPorts] #64088: cargo-c fails to build on 10.13

[MacPorts]

#64088: cargo-c fails to build on 10.13
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  Reporter:  bK4gYuRo  |      Owner:  MarcusCalhoun-Lopez
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.7.1
Resolution:            |   Keywords:  cargo-c
      Port:  cargo-c   |
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Comment (by kencu):

 yes, the clang being used to link should either not be forced to a
 specific clang library, or at least be forced to the matching libary if it
 is forced to something.

 I wonder what witchcraft led rust to think it needed to set clang's
 runtime library specifically? (and wrongly).

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Ticket URL: <https://trac.macports.org/ticket/64088#comment:28>
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