linux-kernel - Re: [PATCH v5 3/4] rust: add a Kconfig function to test for support of bindgen options

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Message-ID: <1a6bb8cd-cc08-458f-a6f6-cdfefd327320@iscas.ac.cn>
Date: Thu, 4 Dec 2025 17:06:05 +0800
From: Vivian Wang <wangruikang@...as.ac.cn>
To: Asuna Yang <spriteovo@...il.com>, Nathan Chancellor <nathan@...nel.org>,
 Nicolas Schier <nsc@...nel.org>, Miguel Ojeda <ojeda@...nel.org>,
 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>,
 Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>,
 Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
 Jonathan Corbet <corbet@....net>, Jason Montleon <jmontleo@...hat.com>,
 Han Gao <rabenda.cn@...il.com>, Conor Dooley <conor@...nel.org>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
 rust-for-linux@...r.kernel.org, llvm@...ts.linux.dev,
 linux-riscv@...ts.infradead.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v5 3/4] rust: add a Kconfig function to test for support
 of bindgen options


On 12/4/25 15:54, Asuna Yang wrote:
> From: Asuna Yang <spriteovo@...il.com>
>
> Add a new `bindgen-backend-option` Kconfig function to test whether the
> bindgen backend supports a given flag.
>
> A subsequent commit will use this function to test for RISC-V extension
> flags.
>
> Signed-off-by: Asuna Yang <SpriteOvO@...il.com>
> ---
>  scripts/Kconfig.include | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include
> index d42042b6c9e2..5d4d29eed0b3 100644
> --- a/scripts/Kconfig.include
> +++ b/scripts/Kconfig.include
> @@ -78,3 +78,8 @@ rustc-llvm-version := $(shell,$(srctree)/scripts/rustc-llvm-version.sh $(RUSTC))
>  # If you are testing for unstable features, consider testing RUSTC_VERSION
>  # instead, as features may have different completeness while available.
>  rustc-option = $(success,trap "rm -rf .tmp_$$" EXIT; mkdir .tmp_$$; $(RUSTC) $(1) --crate-type=rlib /dev/null --out-dir=.tmp_$$ -o .tmp_$$/tmp.rlib)
> +
> +# $(bindgen-backend-option,<flag>)
> +# Return y if bindgen backend supports <flag>, n otherwise
> +# For now, the backend refers only to libclang, so more specifically, this function tests whether the given flag is recognized by the libclang used by bindgen.
> +bindgen-backend-option = $(success,trap "rm -f .tmp_$$.h" EXIT; touch .tmp_$$.h; $(BINDGEN) .tmp_$$.h -- --target=$(BINDGEN_TARGET) $(1))
>
Can probably be simplified down to:

$(BINDGEN) /dev/null -- -x c --target=$(BINDGEN_TARGET) $(1)