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

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Message-Id: <20251124-gcc-rust-v4-v4-3-4e06e07421ae@gmail.com>
Date: Mon, 24 Nov 2025 01:23:23 +0100
From: Asuna Yang <spriteovo@...il.com>
To: Nathan Chancellor <nathan@...nel.org>, 
 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>
Cc: 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, 
 Asuna Yang <SpriteOvO@...il.com>
Subject: [PATCH v4 3/4] rust: add a Kconfig function to test for support of
 bindgen options

Use the `BINDGEN_EXTRA_CLANG_ARGS` environment variable to pass the
`--target` option for cross compiling, so that the function can be used
to test both bindgen options and bindgen backend options.

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 33193ca6e803..a8cfe9f408a5 100644
--- a/scripts/Kconfig.include
+++ b/scripts/Kconfig.include
@@ -75,3 +75,8 @@ 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)
+
+# $(rust-bindgen-option,<flag>)
+# Return y if the Rust bindgen supports <flag>, n otherwise
+# To test options for the bindgen backend, add -- at the beginning, for example: $(rust-bindgen-option,-- <backend-flag>)
+rust-bindgen-option = $(success,trap "rm -f .tmp_$$.h" EXIT; touch .tmp_$$.h; BINDGEN_EXTRA_CLANG_ARGS+=" --target=$(BINDGEN_TARGET)" $(BINDGEN) .tmp_$$.h $(1))

-- 
2.51.1