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Message-ID: <20251110095025.1475896-19-ojeda@kernel.org>
Date: Mon, 10 Nov 2025 10:50:23 +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
Subject: [PATCH 18/18] rust: syn: enable support in kbuild
With all the new files in place and ready from the new crate, enable
the support for it in the build system.
Signed-off-by: Miguel Ojeda <ojeda@...nel.org>
---
Makefile | 1 +
rust/Makefile | 39 +++++++++++++++++++++++++++----
scripts/generate_rust_analyzer.py | 7 ++++++
3 files changed, 43 insertions(+), 4 deletions(-)
diff --git a/Makefile b/Makefile
index f1b38b7fed1e..5364b3ad3600 100644
--- a/Makefile
+++ b/Makefile
@@ -1833,6 +1833,7 @@ rustfmt:
\( \
-path $(srctree)/rust/proc-macro2 \
-o -path $(srctree)/rust/quote \
+ -o -path $(srctree)/rust/syn \
\) -prune -o \
-type f -a -name '*.rs' -a ! -name '*generated*' -print \
| xargs $(RUSTFMT) $(rustfmt_flags)
diff --git a/rust/Makefile b/rust/Makefile
index 801a8cbf3bdd..984aec608c27 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -27,7 +27,7 @@ endif
obj-$(CONFIG_RUST) += exports.o
-always-$(CONFIG_RUST) += libproc_macro2.rlib libquote.rlib
+always-$(CONFIG_RUST) += libproc_macro2.rlib libquote.rlib libsyn.rlib
always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated.rs
always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.c
@@ -101,6 +101,22 @@ quote-flags := \
--extern proc_macro2 \
$(call cfgs-to-flags,$(quote-cfgs))
+# `extra-traits`, `fold` and `visit` may be enabled if needed.
+syn-cfgs := \
+ feature="clone-impls" \
+ feature="derive" \
+ feature="full" \
+ feature="parsing" \
+ feature="printing" \
+ feature="proc-macro" \
+ feature="visit-mut"
+
+syn-flags := \
+ --cap-lints=allow \
+ --extern proc_macro2 \
+ --extern quote \
+ $(call cfgs-to-flags,$(syn-cfgs))
+
# `rustdoc` did not save the target modifiers, thus workaround for
# the time being (https://github.com/rust-lang/rust/issues/144521).
rustdoc_modifiers_workaround := $(if $(call rustc-min-version,108800),-Cunsafe-allow-abi-mismatch=fixed-x18)
@@ -164,11 +180,16 @@ rustdoc-quote: private skip_flags = $(quote-skip_flags)
rustdoc-quote: $(src)/quote/lib.rs rustdoc-clean rustdoc-proc_macro2 FORCE
+$(call if_changed,rustdoc)
+rustdoc-syn: private rustdoc_host = yes
+rustdoc-syn: private rustc_target_flags = $(syn-flags)
+rustdoc-syn: $(src)/syn/lib.rs rustdoc-clean rustdoc-quote FORCE
+ +$(call if_changed,rustdoc)
+
rustdoc-macros: private rustdoc_host = yes
rustdoc-macros: private rustc_target_flags = --crate-type proc-macro \
--extern proc_macro
rustdoc-macros: $(src)/macros/lib.rs rustdoc-clean rustdoc-proc_macro2 \
- rustdoc-quote FORCE
+ rustdoc-quote rustdoc-syn FORCE
+$(call if_changed,rustdoc)
# Starting with Rust 1.82.0, skipping `-Wrustdoc::unescaped_backticks` should
@@ -240,6 +261,10 @@ rusttestlib-quote: private rustc_target_flags = $(quote-flags)
rusttestlib-quote: $(src)/quote/lib.rs rusttestlib-proc_macro2 FORCE
+$(call if_changed,rustc_test_library)
+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_test_library_proc = yes
rusttestlib-macros: $(src)/macros/lib.rs FORCE
@@ -497,19 +522,24 @@ $(obj)/libquote.rlib: private rustc_target_flags = $(quote-flags)
$(obj)/libquote.rlib: $(src)/quote/lib.rs $(obj)/libproc_macro2.rlib FORCE
+$(call if_changed_dep,rustc_hostlibrary)
+$(obj)/libsyn.rlib: private skip_clippy = 1
+$(obj)/libsyn.rlib: private rustc_target_flags = $(syn-flags)
+$(obj)/libsyn.rlib: $(src)/syn/lib.rs $(obj)/libquote.rlib FORCE
+ +$(call if_changed_dep,rustc_hostlibrary)
+
quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@
cmd_rustc_procmacro = \
$(RUSTC_OR_CLIPPY) $(rust_common_flags) $(rustc_target_flags) \
-Clinker-flavor=gcc -Clinker=$(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 $<
# Procedural macros can only be used with the `rustc` that compiled it.
$(obj)/$(libmacros_name): $(src)/macros/lib.rs $(obj)/libproc_macro2.rlib \
- $(obj)/libquote.rlib FORCE
+ $(obj)/libquote.rlib $(obj)/libsyn.rlib FORCE
+$(call if_changed_dep,rustc_procmacro)
$(obj)/$(libpin_init_internal_name): private rustc_target_flags = --cfg kernel
@@ -534,6 +564,7 @@ rust-analyzer:
--cfgs='core=$(core-cfgs)' $(core-edition) \
--cfgs='proc_macro2=$(proc_macro2-cfgs)' \
--cfgs='quote=$(quote-cfgs)' \
+ --cfgs='syn=$(syn-cfgs)' \
$(realpath $(srctree)) $(realpath $(objtree)) \
$(rustc_sysroot) $(RUST_LIB_SRC) $(if $(KBUILD_EXTMOD),$(srcroot)) \
> rust-project.json
diff --git a/scripts/generate_rust_analyzer.py b/scripts/generate_rust_analyzer.py
index 4faf153ed2ee..5b6f7b8d6918 100755
--- a/scripts/generate_rust_analyzer.py
+++ b/scripts/generate_rust_analyzer.py
@@ -100,6 +100,13 @@ def generate_crates(srctree, objtree, sysroot_src, external_src, cfgs, core_edit
cfg=crates_cfgs["quote"],
)
+ append_crate(
+ "syn",
+ srctree / "rust" / "syn" / "lib.rs",
+ ["proc_macro", "proc_macro2", "quote"],
+ cfg=crates_cfgs["syn"],
+ )
+
append_crate(
"macros",
srctree / "rust" / "macros" / "lib.rs",
--
2.51.2
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