linux-kernel - Re: [PATCH v4 3/4] rust: add a Kconfig function to test for support of bindgen options

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Message-ID: <20251124183634.GA1084995@ax162>
Date: Mon, 24 Nov 2025 11:36:34 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: Asuna Yang <spriteovo@...il.com>,
	Nicolas Schier <nicolas.schier@...ux.dev>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Nicolas Schier <nsc@...nel.org>, Jonathan Corbet <corbet@....net>,
	Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	Vivian Wang <wangruikang@...as.ac.cn>,
	Han Gao <rabenda.cn@...il.com>,
	Jason Montleon <jmontleo@...hat.com>,
	Conor Dooley <conor@...nel.org>, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org,
	llvm@...ts.linux.dev, linux-doc@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v4 3/4] rust: add a Kconfig function to test for support
 of bindgen options

On Mon, Nov 24, 2025 at 04:08:36AM +0100, Miguel Ojeda wrote:
> On Mon, Nov 24, 2025 at 3:42 AM Asuna Yang <spriteovo@...il.com> wrote:
> >
> > I will separate them into two functions in the next revision,
> > `bindgen-option` and `bindgen-backend-option` (or `bindgen-cc-option`?
> > Which one do you prefer?).
> 
> If we don't need `bindgen-option` (the normal one I mean) so far,
> perhaps we should skip it. On the other hand, `rustc-option-yn` is
> there and is not used either (it was added for consistency). Up to the
> Kbuild team, I guess.

I do not have a strong preference one way or the other. These macros
tend to be low maintenance and do not take up much space regardless so
preemptively adding it so that it is ready for use in the future is no
big deal in my opinion.

> As for the name, no strong preference. `bindgen-backend-option` sounds
> good, but `bindgen-cc-option` is more consistent with `cc-option` and
> probably easier to understand for people new to `bindgen`, and anyway
> the flags we pass there wouldn't make sense if the backend is not a C
> compiler.

Yeah, I think either one sort of requires knowledge of bindgen to know
the difference between a flag to bindgen and a flag to the C compiler
behind bindgen so no strong preference from my side (Nicolas may feel
differently).

Cheers,
Nathan