[RFC PATCH 1/2] Makefile: Run defconfig files through the C preprocessor

[Simon Glass]

Hi Andrew,

On Tue, 29 Aug 2023 at 16:15, Andrew Davis <afd at ti.com> wrote:
>
> This allows us to use some of the normal preprocessor directives inside
> defconfig files. Such as #define and #include.
>
> Signed-off-by: Andrew Davis <afd at ti.com>
> ---
>  scripts/kconfig/Makefile | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
> index 12e525ee31f..16db9b7cf60 100644
> --- a/scripts/kconfig/Makefile
> +++ b/scripts/kconfig/Makefile
> @@ -93,7 +93,8 @@ endif
>  endif
>
>  %_defconfig: $(obj)/conf
> -       $(Q)$< $(silent) --defconfig=arch/$(SRCARCH)/configs/$@ $(Kconfig)
> +       $(Q)$(CPP) -nostdinc -I $(srctree) -undef -x assembler-with-cpp $(srctree)/arch/$(SRCARCH)/configs/$@ -o generated_defconfig
> +       $(Q)$< $(silent) --defconfig=generated_defconfig $(Kconfig)
>
>  # Added for U-Boot (backward compatibility)
>  %_config: %_defconfig
> --
> 2.39.2
>

Reviewed-by: Simon Glass <sjg at chromium.org>

Can you please check what happens if the file has an error flagged by
CPP? Is it obvious what is wrong?

Regards,
Simon