[U-Boot] kbuild: fix dependency of DT build

[Tom Rini]

On Wed, Oct 11, 2017 at 11:56:10PM +0900, Masahiro Yamada wrote:

> I saw a DT build issue report some time before [1].  I was able to
> reproduce the bug, and figure out the root cause.
> 
> Since commit 6d427c6b1fa0 ("binman: Automatically include a U-Boot
> .dtsi file"), invalid .*.cmd files are generated.
> 
> Since that commit, DTS files are put into sed and piped to CPP.
> Because CPP reads the stream from stdin, -Wp,-MD,$(depfile).pre.tmp
> option generates a depfile with the target name "-".  This is not
> the format expected by fixdep.
> 
> Use one more temporary file instead of using pipe.  With this, deps_
> in the .*.cmd will be fixed.  Having a temp file name in source_ is
> odd, but it is unsed in the build system.  Not a big deal.
> 
> [1] https://lists.denx.de/pipermail/u-boot/2017-June/294451.html
> 
> Fiexes: 6d427c6b1fa0 ("binman: Automatically include a U-Boot .dtsi file")
> Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>

Applied to u-boot/master, thanks!

-- 
Tom
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