[MacPorts] #57196: libgcc7 fails to compile/install on macOS Mojave

[MacPorts]

#57196: libgcc7 fails to compile/install on macOS Mojave
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  Reporter:  ProgrammingPoet  |      Owner:  (none)
      Type:  defect           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.5.3
Resolution:                   |   Keywords:  mojave
      Port:  libgcc7          |
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Comment (by ryandesign):

 Ken, as I [comment:1 explained above], there is a problematic interaction
 between the gcc build system and the APFS filesystem.

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Ticket URL: <https://trac.macports.org/ticket/57196#comment:6>
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