From: Miguel Ojeda <ojeda@kernel.org>
Date: Mon, 24 Nov 2025 15:18:17 +0000 (+0100)
Subject: rust: kbuild: support using libraries in `rustc_procmacro`
X-Git-Tag: v6.19-rc1~175^2^2~15
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c46b34f1d484c11c2a0cbd663168c2213175ca5c;p=thirdparty%2Fkernel%2Flinux.git

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@google.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Tested-by: Gary Guo <gary@garyguo.net>
Tested-by: Jesung Yang <y.j3ms.n@gmail.com>
Link: https://patch.msgid.link/20251124151837.2184382-6-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---

diff --git a/rust/Makefile b/rust/Makefile
index 6fdab341fc48b..0288ca8d270cf 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 $<