linux-kernel - [PATCH v2 03/20] rust: kbuild: add proc macro library support

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Message-ID: <20251124151837.2184382-4-ojeda@kernel.org>
Date: Mon, 24 Nov 2025 16:18:15 +0100
From: Miguel Ojeda <ojeda@...nel.org>
To: Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas@...sle.eu>
Cc: 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>,
	rust-for-linux@...r.kernel.org,
	linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	Jesung Yang <y.j3ms.n@...il.com>
Subject: [PATCH v2 03/20] rust: kbuild: add proc macro library support

Add the proc macro library rule that produces `.rlib` files to be used
by proc macros such as the `macros` crate.

Reviewed-by: Gary Guo <gary@...yguo.net>
Tested-by: Gary Guo <gary@...yguo.net>
Tested-by: Jesung Yang <y.j3ms.n@...il.com>
Signed-off-by: Miguel Ojeda <ojeda@...nel.org>
---
 .gitignore    |  1 +
 rust/Makefile | 10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/.gitignore b/.gitignore
index 86a1ba0d9035..3a7241c941f5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -41,6 +41,7 @@
 *.o.*
 *.patch
 *.pyc
+*.rlib
 *.rmeta
 *.rpm
 *.rsi
diff --git a/rust/Makefile b/rust/Makefile
index 9967f3457d44..45ef84513b6c 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -421,6 +421,16 @@ $(obj)/exports_bindings_generated.h: $(obj)/bindings.o FORCE
 $(obj)/exports_kernel_generated.h: $(obj)/kernel.o FORCE
 	$(call if_changed,exports)
 
+quiet_cmd_rustc_procmacrolibrary = $(RUSTC_OR_CLIPPY_QUIET) PL $@
+      cmd_rustc_procmacrolibrary = \
+	$(if $(skip_clippy),$(RUSTC),$(RUSTC_OR_CLIPPY)) \
+		$(filter-out $(skip_flags),$(rust_common_flags) $(rustc_target_flags)) \
+		--emit=dep-info,link --crate-type rlib -O \
+		--out-dir $(objtree)/$(obj) -L$(objtree)/$(obj) \
+		--crate-name $(patsubst lib%.rlib,%,$(notdir $@)) $<; \
+	mv $(objtree)/$(obj)/$(patsubst lib%.rlib,%,$(notdir $@)).d $(depfile); \
+	sed -i '/^\#/d' $(depfile)
+
 quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@
       cmd_rustc_procmacro = \
 	$(RUSTC_OR_CLIPPY) $(rust_common_flags) $(rustc_target_flags) \
-- 
2.52.0