[U-Boot] kbuild: create a build directory automatically for out-of-tree build

[Tom Rini]

On Mon, Mar 24, 2014 at 01:55:27PM +0900, Masahiro Yamada wrote:

> Prior to Kbuild, the build system created a build directory,
> when it did not exist, for out-of-tree build.
> 
> This feature was dropped when we switched to Kbuild
> because many of lines in makefiles were copied from Linux Kernel.
> (In Linux Kernel, we have to create a build directory by ourselves
> before starting build.)
> 
> That feature seems worth reviving for less typing
> even if our code and Linux Kernel diverge.
> 
> Signed-off-by: Masahiro Yamada <yamada.m at jp.panasonic.com>
> Suggested-by: Simon Glass <sjg at chromium.org>
> Acked-by: Simon Glass <sjg at chromium.org>
> Tested-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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