[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
-------------------------+-----------------------
  Reporter:  iqgrande    |      Owner:  michaelld
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.5.3
Resolution:              |   Keywords:
      Port:  cmake, gcc  |
-------------------------+-----------------------

Comment (by michaelld):

 OK; good. What does these return:
 {{{
 port select --list clang
 port select --list gcc
 port select --list llvm
 port provides /opt/local/bin/c++
 }}}

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Ticket URL: <https://trac.macports.org/ticket/56941#comment:3>
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