[MacPorts] #58462: gcc9 @9.1.0, gcc10 @10-20190505: Portfile parse failures

[MacPorts]

#58462: gcc9 @9.1.0, gcc10 @10-20190505: Portfile parse failures
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  Reporter:  mndavidoff  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  gcc9 gcc10  |
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Comment (by mouse07410):

 Not to mention that {{{cctools +llvm70}}} (the current default) requires
 installation of LLVM-7.0, which could make some (including myself) unhappy
 - it plainly did not work with {{{libgcc9}}}, as the above ticket showed.

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Ticket URL: <https://trac.macports.org/ticket/58462#comment:16>
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