[MacPorts] #56941: cmake @3.12.0_0 and gcc7 @7.3.0_3 don't work well together

[MacPorts]

#56941: cmake @3.12.0_0 and gcc7 @7.3.0_3 don't work well together
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  Reporter:  iqgrande    |      Owner:  michaelld
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.5.3
Resolution:  worksforme  |   Keywords:
      Port:  cmake, gcc  |
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Comment (by kateyalatalo):

 I am having exactly the same issue right now - libgcc7 and libgcc6 are
 failing to build. I attempted the complete forced uninstall of both cmake
 and cctools. It goes into the continuous loop of broken installs of
 libgcc6 and libgcc7. I have just attached the rev-upgrade for my issue as
 well.

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Ticket URL: <https://trac.macports.org/ticket/56941#comment:21>
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