linux-kernel - [PATCH v5 1/4] rust: export BINDGEN

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20251204-gcc-rust-v5-v5-1-2d4f20d86c24@gmail.com>
Date: Thu, 04 Dec 2025 08:54:51 +0100
From: Asuna Yang <spriteovo@...il.com>
To: 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>, 
 Vivian Wang <wangruikang@...as.ac.cn>
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, 
 Asuna Yang <SpriteOvO@...il.com>, Asuna Yang <spriteovo@...il.com>
Subject: [PATCH v5 1/4] rust: export BINDGEN_TARGET from a separate
 Makefile

From: Asuna Yang <spriteovo@...il.com>

A subsequent commit will add a new function `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`.

Therefore, move this variable to a separate new `Makefile.rust` file and
include it from `scripts/Makefile` to make the exported variable
available for use in Kconfig. Place the include in the `need-compiler`
branch to avoid including it in irrelevant make targets.

Since the new file name is `Makefile.rust`, it matches an existing
MAINTAINERS rule `scripts/*rust*`, so no modification to the MAINTAINERS
file is needed.

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

diff --git a/Makefile b/Makefile
index e61f1300fea0..bdbf2025e68c 100644
--- a/Makefile
+++ b/Makefile
@@ -718,9 +718,10 @@ ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
 include $(srctree)/scripts/Makefile.clang
 endif
 
+ifdef need-compiler
+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
 include $(srctree)/scripts/Makefile.compiler
 endif
 
diff --git a/rust/Makefile b/rust/Makefile
index 5d357dce1704..2603b34f9833 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -385,14 +385,6 @@ 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