[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        |
-------------------------+--------------------

Comment (by kencu):

 btw, you have an actual assertion failure in that last crashlog, which is
 helpful.

 most likely as you're now using clang8 as the assembler somehow, and
 assertions are apparently still on.

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Ticket URL: <https://trac.macports.org/ticket/58442#comment:5>
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