[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 rjvbertin@…):

 The role of `default` would be to set a default value that is applied when
 the variable hasn't been set already, no?

 As to your last concern: I think it's not possible to cope with all
 possible f-ups prophylactically. Someone who sets configure.dir to a non-
 standard value should be prepared to change configure.post_args
 accordingly, IMHO.

 BTW, here's an extract from the qt5-mac Portfile, for the sqlite plugin
 (which uses qmake instead of cmake, and doesn't do an OOT build):
 {{{
     # for single architecture, easier to use
     #    worksrcdir ${worksrcdir}/qtbase/src/plugins/sqldrivers/sqlite,
     #    but doesn't work for universal build
     configure.dir ${worksrcpath}/qtbase/src/plugins/sqldrivers/sqlite
     build.dir     ${configure.dir}
     destroot.dir  ${configure.dir}
 }}}

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Ticket URL: <https://trac.macports.org/ticket/33259#comment:24>
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