[RFC PATCH 2/2] kbuild: introduce cmd_dtc_cpp

[Jean-Christophe PLAGNIOL-VILLARD]

On 13:32 Fri 28 Sep     , Stephen Warren wrote:
> From: Stephen Warren <swarren at nvidia.com>
> 
> cmd_dtc_cpp runs the C pre-processor on the input .dts file before
> passing it to dtc for final compilation. This allows used of #define
> within the .dts file.
> 
> Introduce a new rule for %.dtsp -> %.dtb, which uses cmd_dtc_cpp. A new
> file extension is introduced for this purpose, since use of the pre-
> processor must be optional; any property or node name that starts with
> "#" must be escaped to prevent the pre-processor attempting to interpret
> it as a directive. For this reason, skeleton.dtsi-cpp is introduced for
> *.dts-cpp to include.
> 
> Signed-off-by: Stephen Warren <swarren at nvidia.com>
> ---
>  arch/arm/boot/dts/skeleton.dtsip |   13 +++++++++++++
>  scripts/Makefile.lib             |    6 ++++++
>  2 files changed, 19 insertions(+), 0 deletions(-)
>  create mode 100644 arch/arm/boot/dts/skeleton.dtsip
> 
> diff --git a/arch/arm/boot/dts/skeleton.dtsip b/arch/arm/boot/dts/skeleton.dtsip
> new file mode 100644
> index 0000000..8bf6729
> --- /dev/null
> +++ b/arch/arm/boot/dts/skeleton.dtsip
> @@ -0,0 +1,13 @@
> +/*
> + * Skeleton device tree; the bare minimum needed to boot; just include and
> + * add a compatible value.  The bootloader will typically populate the memory
> + * node.
> + */
> +
> +/ {
> +	\#address-cells = <1>;
> +	\#size-cells = <1>;
> +	chosen { };
> +	aliases { };
> +	memory { device_type = "memory"; reg = <0 0>; };
> +};
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index 425578e..9dd81c0 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -269,6 +269,12 @@ cmd_dtc = $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 $(DTC_FLAGS) -d $(depfile
>  $(obj)/%.dtb: $(src)/dts/%.dts FORCE
>  	$(call if_changed_dep,dtc)
>  
> +quiet_cmd_dtc_cpp = DTC+CPP $@
> +cmd_dtc_cpp = $(CC) -E -Wp,-MD,$(depfile) -xc $< | $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 $(DTC_FLAGS) -
> +
> +$(obj)/%.dtb: $(src)/dts/%.dtsp FORCE
> +	$(call if_changed_dep,dtc_cpp)
> +
here no this is build stuff move it to Makefile.build

Best Regards,
J.