On Fri, 22 Apr 2011, Andy Green wrote:
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 oldnoconfigmake 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).
Sure. And you can still copy arch/arm/configs/foo_defconfig to .config and it should work (maybe a "make oldconfig" needed not to be prompted for all missing options). But "make foo_defconfig" is shorter.
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.
Well, most people are not aware of those goodies, so don't feel ashamed. I'm sure you weren't alone at the beach that day. ;-)
Nicolas