linux-kernel - [PATCH v4 1/4] rust: export BINDGEN

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Message-Id: <20251124-gcc-rust-v4-v4-1-4e06e07421ae@gmail.com>
Date: Mon, 24 Nov 2025 01:23:21 +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 1/4] rust: export BINDGEN_TARGET from a separate
 Makefile

A subsequent commit will add a new function `rust-bindgen-option` to
`scripts/Kconfig.include`. The bindgen backend requires the `--target`
option for cross compiling, but variable `BINDGEN_TARGET` in
`rust/Makefile` cannot be exported to `scripts/Kconfig.include`.

Signed-off-by: Asuna Yang <SpriteOvO@...il.com>
---
 Makefile              | 2 ++
 rust/Makefile         | 8 --------
 scripts/Makefile.rust | 9 +++++++++
 3 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/Makefile b/Makefile
index fb4389aa5d5f..e4fcae38cc13 100644
--- a/Makefile
+++ b/Makefile
@@ -718,6 +718,8 @@ ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
 include $(srctree)/scripts/Makefile.clang
 endif
 
+include $(srctree)/scripts/Makefile.rust
+
 # Include this also for config targets because some architectures need
 # cc-cross-prefix to determine CROSS_COMPILE.
 ifdef need-compiler
diff --git a/rust/Makefile b/rust/Makefile
index 7842ad0a4ea7..ae7cbbd89da3 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -300,14 +300,6 @@ bindgen_skip_c_flags := -mno-fp-ret-in-387 -mpreferred-stack-boundary=% \
 	-fzero-init-padding-bits=% -mno-fdpic \
 	--param=% --param asan-% -fno-isolate-erroneous-paths-dereference
 
-# Derived from `scripts/Makefile.clang`.
-BINDGEN_TARGET_x86	:= x86_64-linux-gnu
-BINDGEN_TARGET_arm64	:= aarch64-linux-gnu
-BINDGEN_TARGET_arm	:= arm-linux-gnueabi
-BINDGEN_TARGET_loongarch	:= loongarch64-linux-gnusf
-BINDGEN_TARGET_um	:= $(BINDGEN_TARGET_$(SUBARCH))
-BINDGEN_TARGET		:= $(BINDGEN_TARGET_$(SRCARCH))
-
 # All warnings are inhibited since GCC builds are very experimental,
 # many GCC warnings are not supported by Clang, they may only appear in
 # some configurations, with new GCC versions, etc.
diff --git a/scripts/Makefile.rust b/scripts/Makefile.rust
new file mode 100644
index 000000000000..5c12b4b8c8b6
--- /dev/null
+++ b/scripts/Makefile.rust
@@ -0,0 +1,9 @@
+# Derived from `scripts/Makefile.clang`.
+BINDGEN_TARGET_x86	:= x86_64-linux-gnu
+BINDGEN_TARGET_arm64	:= aarch64-linux-gnu
+BINDGEN_TARGET_arm	:= arm-linux-gnueabi
+BINDGEN_TARGET_loongarch	:= loongarch64-linux-gnusf
+BINDGEN_TARGET_um	:= $(BINDGEN_TARGET_$(SUBARCH))
+BINDGEN_TARGET		:= $(BINDGEN_TARGET_$(SRCARCH))
+
+export BINDGEN_TARGET

-- 
2.51.1