On 04/21/2011 07:47 PM, Somebody in the thread at some point said:
On Thu, 21 Apr 2011, Andy Green wrote:
On 04/21/2011 07:08 PM, Somebody in the thread at some point said:
make ARCH=arm defconfig
cat arch/arm/configs/omap4_defconfig>>.config
make ARCH=arm oldnoconfig
make omap4_defconfig
Wow that is a lot simpler... if you know it.
When trying to figure this out I googled the original patch that added the
savedefconfig and it doesn't mention this Makefile magic; I guess it was added
later.
In fact, this has been there almost forever. The rule is in
scripts/kconfig/Makefile on line 354.
Still, the fact is before you can just copy a whole config from
arch/arm/configs to be .config and vice-versa which has been my usage
pattern. Now with these optimized defconfigs, that doesn't work; it
doesn't hurt to document how to use the new way (even better with your
make target method). It's possible I'm the only guy who missed the day
at school where they talked about arbitrary defconfig targets in
Makefile but I doubt it.
There are a lot of nice Make targets available. Just try "make help".
For some years I used O= in my build scripts because when building
multiple targets from the same tree continuously it can be a nice
timesaver. Likewise I use sparse and so on from there. I agree there
are lots of nice Make targets in there.
-Andy
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