[MacPorts] #58442: gcc9 (and other gccN) fails to install on Mojave, Xcode-10.2.1

[MacPorts]

#58442: gcc9 (and other gccN) fails to install on Mojave, Xcode-10.2.1
-------------------------+--------------------
  Reporter:  mouse07410  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  gcc9        |
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Comment (by mouse07410):

 Yes, could you please do so.

 P.S. You sure the Macports LLVM assembler is "good enough" to be used in
 place of the Xcode assembler, and this bug is the only thing that stands
 in its way?

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Ticket URL: <https://trac.macports.org/ticket/58442#comment:21>
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