[U-Boot] [U-Boot, 1/2] Makefile: use if_change_dep for u-boot.cfg

[Tom Rini]

On Mon, Sep 19, 2016 at 12:20:25PM -0600, Stephen Warren wrote:

> From: Stephen Warren <swarren at nvidia.com>
> 
> cmd_cpp_cfg generates a dependency output, but because it's invoked using
> if_changed rather than if_changed_dep, that dependency file is ignored.
> This results in Kbuild not knowing about which files u-boot.cfg depends
> on, so it may not be rebuilt when required.
> 
> A practical result of this is that u-boot.cfg may continue to reference
> CONFIG_ options that no longer exist in the source tree, and this can
> cause the adhoc config options check to fail.
> 
> This change modifies Makefile to use if_changed_dep, which in turn causes
> all dependencies to be known to the next make invocation.
> 
> Signed-off-by: Stephen Warren <swarren at nvidia.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

A few days ago now, applied to u-boot/master, thanks!

-- 
Tom
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