> Yes, but I think a lot of things still #include <linux/config.h>,
> which AFAIK is the "old style".
Aha, let me illuminate you (and anyone else on the list that cares). :)
_Everything_ still uses #include <linux/config.h>.
There's a program, scripts/mkdep.c, that takes files and computes
dependencies for them. The classical way to do this is to list all
the #include's.
Werner Almesberger had a bright idea: he changed mkdep.c so that when
a file #include's <linux/config.h>, it *does not* have a dependency on
include/linux/config.h! Instead, it has a lot of little dependencies on
little file. So if foo.c uses CONFIG_FOO_1 and CONFIG_FOO_2, it actually
has a dependency on include/config/foo/1.h and include/config/foo/2.h.
All these files are auto-generated and when you run 'make
config/oldconfig/menuconfig/xconfig', only the configuration options
that change get their little files regenerated.
Try it, take a 2.1.9X kernel, build it, add or subtract a few drivers,
build it again, watch what happens. Check out source/mkdep.c,
Documentation/smart-config.txt, and some of the generated .depend files.
Cheers,
Michael Chastain
<mailto:mec@shout.net>
"love without fear"
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