[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):

 For my knowledge, what do the following return:
 {{{
 uname -a
 port version
 port installed and active
 }}}

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Ticket URL: <https://trac.macports.org/ticket/56941#comment:1>
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