linux-kernel - [PATCH v2 20/20] rust: macros: support `proc-macro2`, `quote` and `syn`

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Message-ID: <20251124151837.2184382-21-ojeda@kernel.org>
Date: Mon, 24 Nov 2025 16:18:32 +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 20/20] rust: macros: support `proc-macro2`, `quote` and `syn`

One of the two main uses cases for adding `proc-macro2`, `quote` and
`syn` is the `macros` crates (and the other `pin-init`).

Thus add the support for the crates in `macros` already.

Tested-by: Jesung Yang <y.j3ms.n@...il.com>
Signed-off-by: Miguel Ojeda <ojeda@...nel.org>
---
 rust/Makefile                     | 13 +++++++++----
 scripts/generate_rust_analyzer.py |  2 +-
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/rust/Makefile b/rust/Makefile
index 8988ecf32531..d7d19c21b671 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -184,7 +184,7 @@ rustdoc-syn: $(src)/syn/lib.rs rustdoc-clean rustdoc-quote FORCE
 
 rustdoc-macros: private rustdoc_host = yes
 rustdoc-macros: private rustc_target_flags = --crate-type proc-macro \
-    --extern proc_macro
+    --extern proc_macro --extern proc_macro2 --extern quote --extern syn
 rustdoc-macros: $(src)/macros/lib.rs rustdoc-clean rustdoc-proc_macro2 \
     rustdoc-quote rustdoc-syn FORCE
 	+$(call if_changed,rustdoc)
@@ -256,9 +256,11 @@ rusttestlib-syn: private rustc_target_flags = $(syn-flags)
 rusttestlib-syn: $(src)/syn/lib.rs rusttestlib-quote FORCE
 	+$(call if_changed,rustc_test_library)
 
-rusttestlib-macros: private rustc_target_flags = --extern proc_macro
+rusttestlib-macros: private rustc_target_flags = --extern proc_macro \
+    --extern proc_macro2 --extern quote --extern syn
 rusttestlib-macros: private rustc_test_library_proc = yes
-rusttestlib-macros: $(src)/macros/lib.rs FORCE
+rusttestlib-macros: $(src)/macros/lib.rs \
+    rusttestlib-proc_macro2 rusttestlib-quote rusttestlib-syn FORCE
 	+$(call if_changed,rustc_test_library)
 
 rusttestlib-pin_init_internal: private rustc_target_flags = --cfg kernel \
@@ -339,7 +341,8 @@ quiet_cmd_rustc_test = $(RUSTC_OR_CLIPPY_QUIET) T  $<
 rusttest: rusttest-macros
 
 rusttest-macros: private rustc_target_flags = --extern proc_macro \
-	--extern macros --extern kernel --extern pin_init
+    --extern macros --extern kernel --extern pin_init \
+    --extern proc_macro2 --extern quote --extern syn
 rusttest-macros: private rustdoc_test_target_flags = --crate-type proc-macro
 rusttest-macros: $(src)/macros/lib.rs \
     rusttestlib-macros rusttestlib-kernel rusttestlib-pin_init FORCE
@@ -529,6 +532,8 @@ quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@
 		@$(objtree)/include/generated/rustc_cfg $<
 
 # Procedural macros can only be used with the `rustc` that compiled it.
+$(obj)/$(libmacros_name): private rustc_target_flags = \
+    --extern proc_macro2 --extern quote --extern syn
 $(obj)/$(libmacros_name): $(src)/macros/lib.rs $(obj)/libproc_macro2.rlib \
     $(obj)/libquote.rlib $(obj)/libsyn.rlib FORCE
 	+$(call if_changed_dep,rustc_procmacro)
diff --git a/scripts/generate_rust_analyzer.py b/scripts/generate_rust_analyzer.py
index 5b6f7b8d6918..147d0cc94068 100755
--- a/scripts/generate_rust_analyzer.py
+++ b/scripts/generate_rust_analyzer.py
@@ -110,7 +110,7 @@ def generate_crates(srctree, objtree, sysroot_src, external_src, cfgs, core_edit
     append_crate(
         "macros",
         srctree / "rust" / "macros" / "lib.rs",
-        ["std", "proc_macro"],
+        ["std", "proc_macro", "proc_macro2", "quote", "syn"],
         is_proc_macro=True,
     )
 
-- 
2.52.0