On Mon, Jan 27, 2003 at 05:08:50PM -0600, Kai Germaschewski wrote:
> Well, I suppose arguing about that without a concrete example is kinda
> pointless.
Fair enough.
> You ignored the fact that I said you will be able to use separate
> src/objdir, which means you can have your source read-only.
Yes. That still doesn't change the fact that in 2.4 I need the
headers. In 2.5 I need all 200MB of source + 60MB per different .config
of built tree. And that's per user using that source.
> Yes, all you really need is the checksums. Then again, you also want a way
> to verify a way that the checksums match the ABI as determined by the
> current .config. I mean, just using the previously recorded checksums
> without verifying is kinda pointless, they'll just always match and not
> fulfill their function.
You'd obviously have to have a way in the readonly /usr/src bits
to make sure that autoconf.h and the checksums match. That would have
to be enforced (as Red Hat does now with their method).
> Yup, I now looked into what Redhat does. It's an obvious sign that there
> is work to be done, in particular making the build system work in a way
> that vendors don't need to kludge around it would definitely be nice.
Maybe a way to track the differnet builds. I'm not sure. But
say you had a way of keeping multiple autoconf.h files in a tree. If
the kernel sources could be smart enough to figure out the version.h and
modversions locations from that path, then you could have an external
module create a kbuild makefile for itself and run something like:
make KERN_CONF=/usr/src/linux-2.6.1/include/autoconf/build-smp/autoconf.h modules
where kbuild figures out from KERN_CONF that modversions stuff is in
autoconf/buid-smp/modversions/ and version.h is in
autoconf/build-smp/version.h, etc. Something like that (I can beef with
this example, so no one tell me exactly why this specific example is bad
:-)
> which needs serious thinking and improvement. However, I think I need to
> finish the current work first, i.e. make sure the module versions actually
> work and then the separate obj / src dir stuff.
Yes, I understand that there are priorities.
Joel
--"The cynics are right nine times out of ten." - H. L. Mencken
Joel Becker Senior Member of Technical Staff Oracle Corporation E-mail: joel.becker@oracle.com Phone: (650) 506-8127 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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