[MacPorts] #58324: Libgcc-devel fails to build.

[MacPorts]

#58324: Libgcc-devel fails to build.
-------------------------+-------------------------------------------------
  Reporter:  n7zzt       |      Owner:  (none)
      Type:  update      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.5.4
Resolution:              |   Keywords:  libgcc-devel, upgrade, compile
      Port:  libgcc-     |  error
  devel                  |
-------------------------+-------------------------------------------------

Comment (by kencu):

 It's known that Xcode 10.2 can't build the current gcc trunk. gcc 9 won't
 build. There is a ticket out about that.

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Ticket URL: <https://trac.macports.org/ticket/58324#comment:2>
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