[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:                                       
 Keywords:                           |        Port:                                       
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 Many of the ports that use the cmake portgroup manually do an out-of-
 source build. It would be nice if the cmake portgroup could do this on its
 own, possibly with a tbool option like "cmake.use_out_of_source_build" so
 that individual ports could opt-in.

 Since so many of the ports using this portgroup do this, and out-of-source
 builds are a recommended practice, it might make sense to eventually make
 this option on by default. But all existing cmake portgroup ports would
 have to be tested to ensure they work with it on.

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