[U-Boot] [PATCH] kbuild: avoid race between dtbs and dt/dt.dtb targets

[Andreas Dannenberg]

On Thu, Jun 23, 2016 at 01:53:46PM +0900, Masahiro Yamada wrote:
> If the final targets depend on both "dtbs" and "dts/dt.dtb",
> and -j option is given to the command line, multiple threads
> descend into the dts/ directory, which causes build error.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>

Tested-by: Andreas Dannenberg <dannenberg at ti.com>

Yamada-san,
thanks, this patch is fantastic! It fixes the issue discussed under [1]
(no longer need to suppress parallel DTC compiles) and also avoids the
general double-compile of the DTC files that happened with my patch
series. Tested it on a few TI ARMv7 OMAP-type EVMs and did not see any
adverse effects.

Regards,

--
Andreas Dannenberg
Texas Instruments Inc

[1] https://www.mail-archive.com/u-boot@lists.denx.de/msg217010.html

> ---
> 
>  Makefile | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/Makefile b/Makefile
> index d0e7a8a..ad434c7 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -810,7 +810,9 @@ ifeq ($(CONFIG_DM_I2C_COMPAT),y)
>  endif
>  
>  PHONY += dtbs
> -dtbs dts/dt.dtb: checkdtc u-boot
> +dtbs: dts/dt.dtb
> +	@:
> +dts/dt.dtb: checkdtc u-boot
>  	$(Q)$(MAKE) $(build)=dts dtbs
>  
>  quiet_cmd_copy = COPY    $@
> -- 
> 1.9.1
> 
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