[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 iqgrande):

 I have the requested output below. Please let me know if you need anything
 further.

 {{{
 $ port select --list clang
 Available versions for clang:
         mp-clang-4.0
         mp-clang-5.0
         none (active)
 $ port select --list gcc
 Available versions for gcc:
         mp-gcc5
         mp-gcc6
         mp-gcc7 (active)
         mp-gcc8
         none
 $ port select --list llvm
 Available versions for llvm:
         mp-llvm-3.5
         mp-llvm-4.0
         mp-llvm-5.0
         none (active)
 $ port provides /opt/local/bin/c++
 /opt/local/bin/c++ is not provided by a MacPorts port.
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/56941#comment:4>
MacPorts <https://www.macports.org/>
Ports system for macOS