linux-kernel - [PATCH v2 05/20] rust: kbuild: support using libraries in `rustc

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Message-ID: <20251124151837.2184382-6-ojeda@kernel.org>
Date: Mon, 24 Nov 2025 16:18:17 +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 05/20] rust: kbuild: support using libraries in `rustc_procmacro`

Proc macros such as `macros` and `pin-init` will need the ability to use
libraries such as `syn` (added later) in the `rustc_procmacro` command.

Thus add the support for it.

Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>
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>
---
 rust/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rust/Makefile b/rust/Makefile
index 6fdab341fc48..0288ca8d270c 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -437,7 +437,7 @@ quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@
 		-Clinker-flavor=gcc -Clinker=$(HOSTCC) \
 		-Clink-args='$(call escsq,$(KBUILD_PROCMACROLDFLAGS))' \
 		--emit=dep-info=$(depfile) --emit=link=$@ --extern proc_macro \
-		--crate-type proc-macro \
+		--crate-type proc-macro -L$(objtree)/$(obj) \
 		--crate-name $(patsubst lib%.$(libmacros_extension),%,$(notdir $@)) \
 		@$(objtree)/include/generated/rustc_cfg $<
 
-- 
2.52.0