[U-Boot] [PATCH] kbuild: move ARCH, CPU, etc. to top Makefile to fix random build error

[York Sun <yorksun@freescale.com>]

On 03/31/2015 05:02 AM, Masahiro Yamada wrote:
> Since the Kconfig conversion, some developers have reported that
> Kbuild sometimes fails completely at random.  According to the error
> reports, it seems to occur for any target board, but only on very
> fast computers.
> 
> The log message for the fail case is like this:
> 
>   make[1]: *** No rule to make target `../arch//cpu/u-boot.lds',
>   needed by `u-boot.lds'.  Stop.
> 
> It looks like the top config.mk has not been included for *some*
> reason, and $(ARCH) has been left blank.
> 
> I suspect "autoconf_is_current" is not working in some situation.
> 
> This commit moves the definition of ARCH, CPU, SOC, etc. to the
> top Makefile, so they are surely set.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> Reported-by: Tom Rini <trini@konsulko.com>>
> Reported-by: York Sun <yorksun@freescale.com>
> Reported-by: Stephen Warren <swarren@nvidia.com>
> ---
> 
> Sorry for leaving this problem so long.
> 
> I have never been able to reproduce this bug on my computer,
> so I am not sure this patch can fix the problem.
> I wrote this patch based on my guess.
> (I just tested this patch has no bad impact.)
> 
> Tom, York, Stephen,
> 
> Could you test this patch fixes the problem?
> 

Yes I will try. It seems to related to specific OS. I have seen it on old CentOS
(fast machine though) when running by script. But I haven't been able to
reproduce it reliably.

York