[MacPorts] #57937: gcc9 @9-20181007_1: Compiler fails for trivial program indicating that _stdio.h is missing (also fails for gcc7 and gcc8).

[MacPorts]

#57937: gcc9 @9-20181007_1: Compiler fails for trivial program indicating that
_stdio.h is missing (also fails for gcc7 and gcc8).
---------------------------------------+--------------------
  Reporter:  aszostak-partner-eso-org  |      Owner:  (none)
      Type:  defect                    |     Status:  new
  Priority:  Normal                    |  Milestone:
 Component:  ports                     |    Version:  2.5.4
Resolution:                            |   Keywords:
      Port:  gcc7 gcc8 gcc9            |
---------------------------------------+--------------------

Comment (by yan12125):

 This seems an Xcode 9 issue as Xcode 10 works (1). Could you upgrade Xcode
 and try again?

 1. https://github.com/macports/macports-
 ports/pull/3923#issuecomment-476036983

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Ticket URL: <https://trac.macports.org/ticket/57937#comment:1>
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