[MacPorts] #55382: cmake @3.10.0: Cannot find a C++ compiler supporting C++11 on this system

[MacPorts]

#55382: cmake @3.10.0: Cannot find a C++ compiler supporting C++11 on this system
-------------------------+-------------------------------------------------
  Reporter:  ryandesign  |      Owner:  michaelld
      Type:  defect      |     Status:  new
  Priority:  High        |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  tiger leopard snowleopard lion
      Port:  cmake       |  mountainlion
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Comment (by MarcusCalhoun-Lopez):

 Replying to [comment:24 ryandesign]:
 > I don't understand how that can work. If cmake and cmake39 conflict and
 both install /opt/local/bin/cmake, and if you make one of cmake's
 dependencies depend on cmake39, then cmake will eventually fail to
 activate because cmake39 is active.
 Wouldn't the following code in the [https://github.com/macports/macports-
 ports/blob/7cbbb6dd71f9a9a9d582994985d60283b31ee699/_resources/port1.0/group/cmake-1.0.tcl#L45
 cmake PG] break the circular dependency?
 {{{
 if {${os.major} < 13 && ([string match clang-* ${subport}] || [string
 match llvm-* ${subport}] || [string match libomp* ${subport}])} {
     depends_build-append path:bin/cmake:cmake39
 } else {
     # can use cmake or cmake-devel; default to cmake if not installed
     depends_build-append path:bin/cmake:cmake
 }
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55382#comment:25>
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