Re: Building multipart modules with subdirectories...

[Keith Owens <kaos@ocs.com.au>]

On Fri, 03 Aug 2001 13:40:14 -0500, 
"Steven J. Hill" <sjhill@cotw.com> wrote:
>I have driver that is rather complex and in order to maintain it, the
>module is broke up into 17 different subdirectories. I am maintaining it
>and I am trying to integrate it into the kernel build system.

I had the same problem with XFS.  Code split over multiple directories,
code in the sub directories had to be compiled for modules but not be
installed as a module, instead the sub directory objects are linked
into the parent directory then the whole is installed as one module.
Is that your problem?

In the parent Makefile

--------

O_TARGET := foo.o
obj-m := $(O_TARGET)
foo_subdirs := sub directory list
subdir-$(CONFIG_FOO_DRV) += $(foo_subdirs)
obj-y += $(foreach dir,$(foo_subdirs),$(dir)/$(dir).o)
....
include $(TOPDIR)/Rules.make

# This is really nasty, but Rules.make was never designed for multi directory
# modules and it can race on parallel build.  Keith Owens.
foo.o: $(patsubst %,_modsubdir_%,$(subdir-m))

--------

In each sub directory

--------

O_TARGET := $(notdir $(CURDIR)).o
ifneq ($(MAKECMDGOALS),modules_install)
  obj-m := $(O_TARGET)
endif
obj-y += list of sub directory objects

--------

This is so much easier in kbuild 2.5 :).