[MacPorts] #50271: CMake Portgroup: activate CMAKE_EXPORT_COMPILE_COMMANDS

[MacPorts]

#50271: CMake Portgroup: activate CMAKE_EXPORT_COMPILE_COMMANDS
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  Reporter:  rjvbertin@…  |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.3.4
Resolution:               |   Keywords:
      Port:  cmake        |
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Comment (by rjvbertin@…):

 Turns out an empty compile_commands.json does generate errors in KDevelop;
 it should contain an empty json array instead.

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Ticket URL: <https://trac.macports.org/ticket/50271#comment:1>
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