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

[MacPorts]

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

 I did some very very basic testing, but I couldn't get the code to work in
 the way it was written even after removing the typos and obvious problems.
 I suspect the problem is that
 {{{
 if {${cmake.build_out_of_source}} {
 }}}
 is only evaluated once. And the setting
 {{{
 cmake.build_out_of_source true
 }}}
 after importing the PortGroup has no effect whatsoever. I assume that this
 should be a procedure rather than a setting.

 Here's a draft that worked for me with at least one port:
 {{{
 options cmake.build_out_of_source
 option_proc cmake.build_out_of_source cmake._set_out_of_source_build

 proc cmake._set_out_of_source_build {option action args} {
     global workpath worksrcpath configure.dir build.dir

     if {"set" ne ${action}} {
         return
     }

     if {${args} eq "true"} {
         configure.dir       ${workpath}/build
         build.dir           ${configure.dir}
         # standard post-arg, where the primary CMakeLists.txt file can be
 found
         configure.post_args ${worksrcpath}
         # create the build directory
         post-extract        { file mkdir ${build.dir} }
     }
 }
 }}}
 I was copy-pasting from another PortGroup, so I'm not sure if I actually
 got all the bits and pieces right.

-- 
Ticket URL: <https://trac.macports.org/ticket/33259#comment:20>
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