rust: quote: 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.

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/20251124151837.2184382-15-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Makefile

@@ -1834,6 +1834,7 @@ rustfmt:
 	$(Q)find $(srctree) $(RCS_FIND_IGNORE) \
 		\( \
 			-path $(srctree)/rust/proc-macro2 \
+			-o -path $(srctree)/rust/quote \
 		\) -prune -o \
 		-type f -a -name '*.rs' -a ! -name '*generated*' -print \
 		| xargs $(RUSTFMT) $(rustfmt_flags)

rust/Makefile

@@ -27,7 +27,7 @@ endif
 
 obj-$(CONFIG_RUST) += exports.o
 
-always-$(CONFIG_RUST) += libproc_macro2.rlib
+always-$(CONFIG_RUST) += libproc_macro2.rlib libquote.rlib
 
 always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated.rs
 always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.c
@@ -89,6 +89,18 @@ proc_macro2-flags := \
     -Zcrate-attr='feature(proc_macro_byte_character,proc_macro_c_str_literals)' \
     $(call cfgs-to-flags,$(proc_macro2-cfgs))
 
+quote-cfgs := \
+    feature="proc-macro"
+
+quote-skip_flags := \
+    --edition=2021
+
+quote-flags := \
+    --edition=2018 \
+    --cap-lints=allow \
+    --extern proc_macro2 \
+    $(call cfgs-to-flags,$(quote-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)
@@ -143,10 +155,17 @@ rustdoc-proc_macro2: private rustc_target_flags = $(proc_macro2-flags)
 rustdoc-proc_macro2: $(src)/proc-macro2/lib.rs rustdoc-clean FORCE
 	+$(call if_changed,rustdoc)
 
+rustdoc-quote: private rustdoc_host = yes
+rustdoc-quote: private rustc_target_flags = $(quote-flags)
+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-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 FORCE
+rustdoc-macros: $(src)/macros/lib.rs rustdoc-clean rustdoc-proc_macro2 \
+    rustdoc-quote FORCE
 	+$(call if_changed,rustdoc)
 
 # Starting with Rust 1.82.0, skipping `-Wrustdoc::unescaped_backticks` should
@@ -207,6 +226,11 @@ rusttestlib-proc_macro2: private rustc_target_flags = $(proc_macro2-flags)
 rusttestlib-proc_macro2: $(src)/proc-macro2/lib.rs FORCE
 	+$(call if_changed,rustc_test_library)
 
+rusttestlib-quote: private skip_flags = $(quote-skip_flags)
+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-macros: private rustc_target_flags = --extern proc_macro
 rusttestlib-macros: private rustc_test_library_proc = yes
 rusttestlib-macros: $(src)/macros/lib.rs FORCE
@@ -458,6 +482,12 @@ $(obj)/libproc_macro2.rlib: private rustc_target_flags = $(proc_macro2-flags)
 $(obj)/libproc_macro2.rlib: $(src)/proc-macro2/lib.rs FORCE
 	+$(call if_changed_dep,rustc_procmacrolibrary)
 
+$(obj)/libquote.rlib: private skip_clippy = 1
+$(obj)/libquote.rlib: private skip_flags = $(quote-skip_flags)
+$(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_procmacrolibrary)
+
 quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@
       cmd_rustc_procmacro = \
 	$(RUSTC_OR_CLIPPY) $(rust_common_flags) $(rustc_target_flags) \
@@ -469,7 +499,8 @@ 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): $(src)/macros/lib.rs $(obj)/libproc_macro2.rlib FORCE
+$(obj)/$(libmacros_name): $(src)/macros/lib.rs $(obj)/libproc_macro2.rlib \
+    $(obj)/libquote.rlib FORCE
 	+$(call if_changed_dep,rustc_procmacro)
 
 $(obj)/$(libpin_init_internal_name): private rustc_target_flags = --cfg kernel
@@ -493,6 +524,7 @@ rust-analyzer:
 	$(Q)MAKEFLAGS= $(srctree)/scripts/generate_rust_analyzer.py \
 		--cfgs='core=$(core-cfgs)' $(core-edition) \
 		--cfgs='proc_macro2=$(proc_macro2-cfgs)' \
+		--cfgs='quote=$(quote-cfgs)' \
 		$(realpath $(srctree)) $(realpath $(objtree)) \
 		$(rustc_sysroot) $(RUST_LIB_SRC) $(if $(KBUILD_EXTMOD),$(srcroot)) \
 		> rust-project.json

scripts/generate_rust_analyzer.py

@@ -93,6 +93,13 @@ def generate_crates(srctree, objtree, sysroot_src, external_src, cfgs, core_edit
         cfg=crates_cfgs["proc_macro2"],
     )
 
+    append_crate(
+        "quote",
+        srctree / "rust" / "quote" / "lib.rs",
+        ["alloc", "proc_macro", "proc_macro2"],
+        cfg=crates_cfgs["quote"],
+    )
+
     append_crate(
         "macros",
         srctree / "rust" / "macros" / "lib.rs",