kbuild: libraries and subdirectories

["Budde, Marco" <budde@telos.de>]

I have a large number of sources files, which I have to
compile into one kernel module. Let's assume I have the
following source organisation:

  main/
    main_code.c
  lib1/
    part1/
      file_1_1_1.c
    part2/
      file_1_2_1.c
  lib2/
    part1/
      file_2_1_1.c
    part2/
      file_2_2_1.c

I would like to build all source files in lib1 into one
lib.a library and all files in lib2 into a second lib.a
library.

At the end I would like to compile the code in main and
link every together (result should be one kernel module).

How can I archieve this with kbuild? Its documentation is not
really deep.

I have added to all subdirectories kbuild files looking like
this:

   lib-m = file_1_1_1.c

This works and creates lib.a archives. In fact I have got
two problems:

 *) How can I tell kbuild in lib1 and lib2 to descend into
    the part directories?

 *) How can I link the libraries of the part directories into
    libs in the lib directories?

cu, Marco

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