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rust: pin-init: add syn dependency and remove proc-macro[2] and quote workarounds

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`syn` makes parsing Rust from proc-macros a lot simpler. `pin-init` has
not used `syn` up until now, because the we did not support it. That
changed in commit 54e3eae855 ("Merge patch series "`syn` support""),
so we can finally utilize the added ergonomics of parsing proc-macro
input with `syn`.

Previously we only had the `proc-macro` library available, whereas the
user-space version also used `proc-macro2` and `quote`. Now both are
available, so remove the workarounds.

Due to these changes, clippy emits warnings about unnecessary
`.to_string()` as `proc-macro2` provides an additional `PartialEq` impl
on `Ident`, so the warnings are fixed.

[ Adjusted wording from upstream version and added build system changes
  for the kernel - Benno ]

Co-developed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Tamir Duberstein <tamird@gmail.com>
Tested-by: Andreas Hindborg <a.hindborg@kernel.org>
Signed-off-by: Benno Lossin <lossin@kernel.org>
This commit is contained in:
Benno Lossin
2026-01-16 11:54:18 +01:00
parent 901f1d73d2
commit 514e4ed2c9
7 changed files with 25 additions and 50 deletions
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16
rust/Makefile
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@@ -212,9 +212,10 @@ rustdoc-ffi: $(src)/ffi.rs rustdoc-core FORCE
rustdoc-pin_init_internal: private rustdoc_host = yes
rustdoc-pin_init_internal: private rustc_target_flags = --cfg kernel \
--extern proc_macro --crate-type proc-macro
--extern proc_macro --extern proc_macro2 --extern quote --extern syn \
--crate-type proc-macro
rustdoc-pin_init_internal: $(src)/pin-init/internal/src/lib.rs \
rustdoc-clean FORCE
rustdoc-clean rustdoc-proc_macro2 rustdoc-quote rustdoc-syn FORCE
+$(call if_changed,rustdoc)
rustdoc-pin_init: private rustdoc_host = yes
@@ -273,9 +274,10 @@ rusttestlib-macros: $(src)/macros/lib.rs \
+$(call if_changed,rustc_test_library)
rusttestlib-pin_init_internal: private rustc_target_flags = --cfg kernel \
--extern proc_macro
--extern proc_macro --extern proc_macro2 --extern quote --extern syn
rusttestlib-pin_init_internal: private rustc_test_library_proc = yes
rusttestlib-pin_init_internal: $(src)/pin-init/internal/src/lib.rs FORCE
rusttestlib-pin_init_internal: $(src)/pin-init/internal/src/lib.rs \
rusttestlib-proc_macro2 rusttestlib-quote rusttestlib-syn FORCE
+$(call if_changed,rustc_test_library)
rusttestlib-pin_init: private rustc_target_flags = --extern pin_init_internal \
@@ -547,8 +549,10 @@ $(obj)/$(libmacros_name): $(src)/macros/lib.rs $(obj)/libproc_macro2.rlib \
$(obj)/libquote.rlib $(obj)/libsyn.rlib FORCE
+$(call if_changed_dep,rustc_procmacro)
$(obj)/$(libpin_init_internal_name): private rustc_target_flags = --cfg kernel
$(obj)/$(libpin_init_internal_name): $(src)/pin-init/internal/src/lib.rs FORCE
$(obj)/$(libpin_init_internal_name): private rustc_target_flags = --cfg kernel \
--extern proc_macro2 --extern quote --extern syn
$(obj)/$(libpin_init_internal_name): $(src)/pin-init/internal/src/lib.rs \
$(obj)/libproc_macro2.rlib $(obj)/libquote.rlib $(obj)/libsyn.rlib FORCE
+$(call if_changed_dep,rustc_procmacro)
quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L $@