[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@…):

 I tested the latest version on a few ports, and they all worked. I don't
 like the multiple use of "mkdir" even when it is unnecessary (not out of
 tree build), but it works (I think 'port' internally either checks to see
 if the directory already exists & if so then does nothing, or just ignores
 what the system call returns; I didn't test beyond this). That said, I
 would prefer to not break anything up front, so allow ports to opt in as
 they can. Somewhere down the road we do a swap-around & fix whatever is
 left. This could be done via a cmake-1.1 PortGroup, yes; that might be the
 better way to do this, since it would require no changes down the road.

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Ticket URL: <https://trac.macports.org/ticket/33259#comment:45>
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