[MacPorts] #59133: libgcc9 fails to build with Mojave and Xcode 11 latestrelease

[MacPorts]

#59133: libgcc9 fails to build with Mojave and Xcode 11 latestrelease
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  Reporter:  vdoublie  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.0
Resolution:            |   Keywords:  libgcc9
      Port:  libgcc9   |
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Comment (by kencu):

 nothing related to gcc can presently build against the xcode11 10.15
 headers.

 see many other open tickets. gcc is working on it. Only reliable option is
 to go back to Xcode10 until it gets sorted out.

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Ticket URL: <https://trac.macports.org/ticket/59133#comment:2>
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