[U-Boot] kbuild: fix CROSS_COMPILE settings in config.mk

[Tom Rini]

On Fri, Feb 28, 2014 at 02:33:30PM +0900, Masahiro Yamada wrote:

> The syntax
>   CROSS_COMIPLE ?= <cross_compiler_prefix>
> does not work because config.mk is parsed after
> exporting CROSS_COMPILE.
> 
> Like Linux Kernel's arch/$(ARCH)/Makefile,
> we must write as follows:
> 
>   ifeq ($(CROSS_COMPILE),)
>   CROSS_COMPILE := <cross_compiler_prefix>
>   endif
> 
> Signed-off-by: Masahiro Yamada <yamada.m at jp.panasonic.com>

Applied to u-boot/master, thanks!

-- 
Tom
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