linux-kernel - Re: [PATCH] Support conditional deps using "depends on X if Y"

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Message-ID: <82317993284703834a7b1d8d5ca05b7c646f2795@intel.com>
Date: Mon, 10 Nov 2025 10:48:59 +0200
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Nathan Chancellor <nathan@...nel.org>, Graham Roff
 <grahamr@....qualcomm.com>
Cc: Nicolas Schier <nsc@...nel.org>, Jonathan Corbet <corbet@....net>,
 linux-kbuild@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, Nicolas Pitre <nico@...xnic.net>
Subject: Re: [PATCH] Support conditional deps using "depends on X if Y"

On Sun, 09 Nov 2025, Nathan Chancellor <nathan@...nel.org> wrote:
> I think it would be useful to have a slightly more concrete example in
> the documentation of where this could be useful because even with the
> "if" syntax, it still feels a little confusing to me at least with the
> current example. Since this is just internally converting "depends on A
> if B" to "depends on A || !B", this seems like a low risk addition to
> the Kconfig language but it would be good to have some tests under
> scripts/kconfig/tests like the ones recently added by commit
> f9afce4f32e9 ("kconfig: Add transitional symbol attribute for migration
> support") upstream.

"depends on A || !A" (or A=n) is the most common pattern in Kconfig,
which literally means "depends on A if A".

BR,
Jani.


-- 
Jani Nikula, Intel