[U-Boot] kbuild: define DO_DEPS_ONLY for u-boot.cfg to fix build error

[Tom Rini]

On Tue, May 26, 2015 at 12:51:25PM +0900, Masahiro Yamada wrote:

> Since 741e58e0fc8e (Create a .cfg file containing the CONFIG options
> used to build), all the Blackfin boards fail to build if the parallel
> (-j) option is passed.
> 
>   $ make -s bf506f-ezkit_defconfig
>   #
>   # configuration written to .config
>   #
>   $ make -j8 CROSS_COMPILE=bfin-elf-
>   scripts/kconfig/conf --silentoldconfig Kconfig
>     CHK     include/config.h
>     UPD     include/config.h
>     GEN     include/autoconf.mk
>     GEN     include/autoconf.mk.dep
>     CHK     include/config/uboot.release
>     CHK     include/generated/timestamp_autogenerated.h
>     UPD     include/generated/timestamp_autogenerated.h
>     CFG     u-boot.cfg
>   include/asm-offsets.h:3:43: fatal error:
>   generated/generic-asm-offsets.h: No such file or directory
>   compilation terminated.
>   make: *** [u-boot.cfg] Error 1
> 
> When parsing header files for defined CONFIG options, DO_DEPS_ONLY
> must be defined to exclude generated headers that might not have
> been available yet.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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