A closer check revealed:

Cmake simply ignores the ooc stuff alltogether

The Rmakefile builds object files from all the oocxxx.c files,
but not for pmapooc.c.

And finally in the sources, I found why:
pmapdata.c #includes pmapooc.c (or alternatively pmapkdt.c), depending
on -DPMAP_OOC.
No provisions to actually set the latter, though.

but that's an easy enough excercise...
After a bit of digging about which files actually need that define,
The SCons build now supports OOC for Pmap, with a configuration option
aptly named - PMAP_OOC.
It is enabled by default on unixoid systems and unavailable on Windows.

The latter is because the code actively refuses to build on Windows.
@Roland
  Are you still hibernating?
  Are there technically difficult reasons for this, or did you just
  not get around to fixing and testing it on Windows yet?
  At a quick glance through the code I didn't notice any particularly
  platform dependent stuff, but of course I may have missed something.


-schorsch


Am 2018-01-08 16:03, schrieb Guglielmetti, Robert:
Hi Georg! Long time. We are about done with a re-write of the Cmake
build system as well, which allows us to do automated build/test/CI on
our GitHub mirror of the Radiance CVS repo. Exciting times!

There was some shuffling around of the pmap includes. It’s been
building for us on Windows since late summer 2017, I’ll have to look
and see what we are doing, unless Roland/Greg know offhand.

- Rob

On 1/8/18, 6:44 AM, "Georg Mischler" <schor...@schorsch.com> wrote:

    Hello everybody,

    As it is starting to turn into a new year's tradition, I've just
    updated the SCons build system once again.

    Good news 1:
    With Scons 3.1 (probably since 3.0), despite what the documentation
    says, it works very nicely with Python 3.x (3.6 in my case).
    After some adaptions from my side, this means that all the Python
    code in the Radiance distribution is now compatible with both
    Python 2.7 and 3.x.

    Good news 2:
Microsoft has fixed their Universal CRT (didn't check in which version). This means that the line-end-eating bug in pipes is gone, and we can
    reliably build Radiance with the current Visual Studio tools again.
    I have now completely switched to VS 2017 myself.

    Open Issue:
    There's a buch of code relating to "out of core octree" building
    for Pmap. Most of this compiles fine, except for pmapooc.c, which
    is missing some header file includes. Unfortunately, that seems to
    be the central cornerstone binding all the others together...
    @Roland:
Can you share some insight whether this is supposed to be working,
      or still a work in progress that I should ignore for the moment?
      Or alternatively, am I doing anything wrong for making it work?


    Cheers
    -schorsc


    --
Georg Mischler -- simulations developer -- schorsch at schorsch com
    +schorsch.com+  --  lighting design tools  --
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