[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:
      Port:  libgcc9   |
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Comment (by vdoublie):

 uh tried ti install gcc9 on macOS 10.15 Xcode 11.1 (user release) and I
 get a series of errors
 will join the log file. This errors I saw on 10.14 + Xcode 11 Betas.
 Now gcc9 builds on 10.14+Xcode 11.1
 but still not on Catalina Xcode 11.1
 see main.log

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Ticket URL: <https://trac.macports.org/ticket/59133#comment:11>
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