linux-kernel - Re: [PATCH 00/18] `syn` support

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Message-ID: <20251121053633.1594703-1-ojeda@kernel.org>
Date: Fri, 21 Nov 2025 06:36:33 +0100
From: Miguel Ojeda <ojeda@...nel.org>
To: y.j3ms.n@...il.com
Cc: a.hindborg@...nel.org,
	alex.gaynor@...il.com,
	aliceryhl@...gle.com,
	bjorn3_gh@...tonmail.com,
	boqun.feng@...il.com,
	dakr@...nel.org,
	gary@...yguo.net,
	linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lossin@...nel.org,
	nathan@...nel.org,
	nicolas@...sle.eu,
	ojeda@...nel.org,
	patches@...ts.linux.dev,
	rust-for-linux@...r.kernel.org,
	tmgross@...ch.edu
Subject: Re: [PATCH 00/18] `syn` support

On Fri, 21 Nov 2025 04:37:47 +0000 Jesung Yang <y.j3ms.n@...il.com> wrote:
>
> I'd appreciate any guidance on steps I might be missing. Thanks in
> advance!

For using (all of) them from `macros`, you would need [1].

Maybe I should just put it on top of this series for convenience.

Cheers,
Miguel

diff --git a/rust/Makefile b/rust/Makefile
index 984aec608c27..640e51129be0 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -187,7 +187,7 @@ 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)
@@ -265,9 +265,11 @@ 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 \
@@ -348,7 +350,8 @@ 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
@@ -538,6 +541,8 @@ 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)