[MacPorts] #33259: cmake portgroup: out of source build option, possibly by default

[MacPorts]

#33259: cmake portgroup: out of source build option, possibly by default
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  Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
      Type:  enhancement   |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:                |
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Comment (by michaelld@…):

 My US$0.02 here: Let's do the global variable boolean optionsas suggested
 by Mojca that are off by default (for now). When a Portfile sets the value
 to on/true, we use the VPATH build. In this way, all current ports will
 still work and we can transition to using the new way as needed and time
 allows. At some time down the road, we can swap the default value to
 on/true, and update all of the ports using the CMake portgroup
 accordingly.

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Ticket URL: <https://trac.macports.org/ticket/33259#comment:13>
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