Re: [PATCH] ppp: Pass PPP Kconfig defines through to the CPP

[Andrew Lunn <andrew@lunn.ch>]

On Mon, Mar 31, 2025 at 08:49:16PM +0100, steve@snewbury.org.uk wrote:
> From: Steven Newbury <steve@snewbury.org.uk>
> 
> It seems for a very long time the conditional code in ppp_generic.c for PPP_MULTILINK
> and PPP_FILTER hasn't been compiled!  I do wonder whether anybody actually still uses
> these options!
> ---
>  drivers/net/ppp/Makefile | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/net/ppp/Makefile b/drivers/net/ppp/Makefile
> index 16c457d6b324..9d12915e4ac5 100644
> --- a/drivers/net/ppp/Makefile
> +++ b/drivers/net/ppp/Makefile
> @@ -12,3 +12,10 @@ obj-$(CONFIG_PPP_SYNC_TTY) += ppp_synctty.o
>  obj-$(CONFIG_PPPOE) += pppox.o pppoe.o
>  obj-$(CONFIG_PPPOL2TP) += pppox.o
>  obj-$(CONFIG_PPTP) += pppox.o pptp.o
> +
> +ifdef CONFIG_PPP_MULTILINK
> +ccflags-y += -DCONFIG_PPP_MULTILINK
> +endif
> +ifdef CONFIG_PPP_FILTER
> +ccflags-y += -DCONFIG_PPP_FILTER
> +endif

That looks very odd. I don't see many other instances for Makefiles
doing this. Please add a bigger explanation of why this is needed, and
why the usual Kconfig mechanism don't work.

    Andrew

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