[Omake] Restarting omake

[David Kågedal]

I have a lot of small modules, but I usually only need to build a few
of them. I'm also using a separate build tree, which means that I need
to create a mirror directory structure of all the module directories
in the build tree, since omake needs to be able to read all the module
OMakefiles.

I was thinking about if there was a way to avoid having to create all
the directories, and instead use something like this:

=== OMakefile:
    vmount(src, build)
    .SUBDIR: build
        .SUBDIR: modules
            MODULES[] = a b c d e f g h i j ...
            foreach(m, $(MODULES))
                # Check if the module build dir exists
                if $(file-exists ./$m)
                    .SUBDIR: $m
                    # The $m/OMakefile in the module contains a rule to
                    # build $m/module.so
                else
                    .PHONY: $m/module.so
                    $m/module.so :
                        mkdir $m
                        RestartOMake()

The point is that if the build directory didn't exist, an alternat
build rule is used that creates the build directory and restarts
omake, so that it can rescan the omakefiles and find the new module.

Does this make any sense?  This could improve the scalability of
omake, and I can imagine other uses in even more dynamic scenarios.

Is this maybe even possible to do today?

-- 
David Kågedal, Virtutech