[MacPorts] #57726: pgplot demo 'cpgdemo' segfaults with variant gcc8, ok with gcc7

[MacPorts]

#57726: pgplot demo 'cpgdemo' segfaults with variant gcc8, ok with gcc7
----------------------+---------------------------------
  Reporter:  d-lamb   |      Owner:  MarcusCalhoun-Lopez
      Type:  defect   |     Status:  closed
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:  wontfix  |   Keywords:
      Port:  pgplot   |
----------------------+---------------------------------

Comment (by d-lamb):

 I just rebuilt my whole MacPorts tree, using only gcc9, and the cpgdemo
 now works.  I think the note that is present, that the C bindings do not
 work with gcc8, is still sufficient.

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Ticket URL: <https://trac.macports.org/ticket/57726#comment:5>
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