From 66ba9a0a666bb9cc3181c1bcf08a52729d7a0084 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Mon, 4 Jul 2022 09:20:52 -0700
Subject: [PATCH] Preserve clippy attrs on extern "Rust" fn

    #[cxx::bridge]
    mod ffi {
        extern "Rust" {
            #[allow(clippy::too_many_arguments)]
            fn repro(a: i32, b: i32, c: i32, d: i32, e: i32, f: i32, g: i32, h: i32) -> bool;
        }
    }

Before:

    warning: this function has too many arguments (8/7)
     --> src/main.rs:5:12
      |
    5 |         fn repro(a: i32, b: i32, c: i32, d: i32, e: i32, f: i32, g: i32, h: i32) -> bool;
      |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      |
      = note: `#[warn(clippy::too_many_arguments)]` on by default
      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#too_many_arguments

After: no lint.
---
 macro/src/expand.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/macro/src/expand.rs b/macro/src/expand.rs
index 8ca2c4af..7e93368b 100644
--- a/macro/src/expand.rs
+++ b/macro/src/expand.rs
@@ -787,6 +787,7 @@ fn expand_function_pointer_trampoline(
         prevent_unwind_label,
         None,
         Some(&efn.generics),
+        &efn.attrs,
         body_span,
     );
     let var = &var.rust;
@@ -937,6 +938,7 @@ fn expand_rust_function_shim(efn: &ExternFn, types: &Types) -> TokenStream {
         prevent_unwind_label,
         invoke,
         None,
+        &efn.attrs,
         body_span,
     )
 }
@@ -949,6 +951,7 @@ fn expand_rust_function_shim_impl(
     prevent_unwind_label: String,
     invoke: Option<&Ident>,
     outer_generics: Option<&Generics>,
+    attrs: &OtherAttrs,
     body_span: Span,
 ) -> TokenStream {
     let generics = outer_generics.unwrap_or(&sig.generics);
@@ -1123,6 +1126,7 @@ fn expand_rust_function_shim_impl(
     };
 
     quote_spanned! {span=>
+        #attrs
         #[doc(hidden)]
         #[export_name = #link_name]
         unsafe extern "C" fn #local_name #generics(#(#all_args,)* #outparam #pointer) #ret {