[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:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.5.3
Resolution:              |   Keywords:
      Port:  cmake, gcc  |
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Comment (by michaelld):

 Awesome. You're welcome & thank you for being so responsive! Makes working
 with folks so much easier!

 I'm going to close this ticket as "worksforme" since it does & you managed
 to get it working for you too, using the defaults for `cctools`. I'm
 hoping there's a ticket out there for `cctools +llvm40`, since it clearly
 doesn't work right now.

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Ticket URL: <https://trac.macports.org/ticket/56941#comment:16>
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