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SubjectRe: Kernel source tree splitting
> On 4/30/2003 at 5:21 PM Randy.Dunlap wrote:
>>I'm probably misreading this...but,
>>Have you tried this yet? Does it modify/customize all Kconfig
>>and Makefiles for the selected tree splits?
> I didn't try it. It would require knowledge of all interdependencies
> between modules (i.e. ide-scsi is part of ide. ide-scsi depends
> on scsi), also all source files that belong to each config option
> would likely need to be understood by the persons working to
> do this, and also the entire build system semantics would need
> to be designed to work in pieces. Assuming this is ever done.
> It goes like this:
> make *config reads kernel-tree/options/foo.lod
> make *config gets to configuration baz in bar.lod
> make *config sees baz needs foo
> make *config lists baz.
> make *config sees biz needs data
> make *config refuses to show biz
> make missing-depends shows a list of unselectable options and
> -----------selecting one tells which kernel option is needed.
> make bzImage reads through kernel-tree/options/ and finds which
> -----------makefiles to call (current makes have these embedded)
> make bzImage builds a kernel.
> make modules reads through kernel-tree/options/ and finds which
> -----------makefiles to call.
> make modules builds a kernel.
>>A few days ago, in one tree, I rm-ed arch/{all that I don't need} and
>> drivers/{all that I don't need}.
>>After that I couldn't run "make *config" because it wants all of
>>those files, even if I don't want them.
> That WILL break something.

or "That does break something" (when I tried it).

>>So there are many edits that needed to be done in lots of
>>Kconfig and Makefiles if one selectively pulls or omits certain
> The main Makefile will have to be redone. So would the kconfig
> things (make config/menuconfig/xconfig).
> The extra plus to this is that other people can steal the build
> system for other projects lol.

I seem to try for simple solutions when possible and feasible.

In this case, if I were doing it, I would try changing (e.g.) in
arch/i386/kernel/Kconfig, this line:
source "drivers/eisa/Kconfig"
optsource "drivers/eisa/Kconfig"
where optsource means that the file is optional -- if not found,
ignore it. And then see what happens, how far it can go,
what the next problem is....

If this could be made to work, then entire subdirectories/subsystems
could be optional.


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