how well does multi-arch build handle recursive building?

[Robert P. J. Day]

  at the moment, i'm using paul's multi-architecture build described
here:

http://make.paulandlesley.org/multi-arch.html

successfully for simple builds for which all of the source files are
in a single directory.  (i'm not actually doing multi-architecture
builds, i'm just using that technique to build the results in a remote
directory.  same difference, obviously.)

so how well does that technique extend to recursive builds?  does it
*naturally* handle a recursive set of makefiles, or do i have to add
that extra makefile wrapper at every level of the recursive build
directory hierarchy?

i realize i could probably figure that out just from examining the
code but i'm already being pushed intellectually just to keep a handle
on the simpler case.

rday