[MacPorts] #57612: clang does not respect -syslibroot when linking

[MacPorts]

#57612: clang does not respect -syslibroot when linking
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  Reporter:  kencu   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:          |
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Comment (by kencu):

 This confusion goes back into antiquity. <https://lists.apple.com/archives
 /xcode-users/2005/Dec/msg00524.html> .

 Perhaps there is a reason this works like this, on purpose. But it seems
 to me that if you specify a non-default `syslibroot`, it's because you
 want to use it **instead** of the default, not appended to it.

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Ticket URL: <https://trac.macports.org/ticket/57612#comment:7>
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