fix: only emit cfg attributes

Author: rich-ayr

bindgen/Cargo.toml

@@ -16,7 +16,7 @@ readme = "../README.md"
 repository = "https://github.com/rust-lang/rust-bindgen"
 documentation = "https://docs.rs/bindgen"
 homepage = "https://rust-lang.github.io/rust-bindgen/"
-version = "0.71.1"
+version = "0.69.5"
 build = "build.rs"
 rust-version.workspace = true
 edition.workspace = true

bindgen/codegen/mod.rs

@@ -1119,7 +1119,8 @@ impl CodeGenerator for Type {
                     attrs.extend(
                         parse_tokens(inner_attrs)
                             .into_iter()
-                            .map(|attr| parse_quote! { #attr })
+                            .filter(|t| !t.is_empty())
+                            .map(|t| parse_quote! {#t})
                             .filter_map(|attr: Attribute| {
                                 if attr.path().is_ident("cfg") ||
                                     attr.path().is_ident("link")
@@ -2663,6 +2664,17 @@ impl CodeGenerator for CompInfo {
             },
         );
 
+        // TODO: Make `cfg_attrs`
+        let cfg_attrs = attrs
+            .iter()
+            .filter(|t| !t.is_empty())
+            .map(|t| parse_quote! {#t})
+            .filter(|attr: &Attribute| {
+                let path = attr.path();
+                path.is_ident("cfg") || path.is_ident("link")
+            })
+            .collect::<Vec<_>>();
+
         let mut tokens = if is_rust_union {
             quote! {
                 #( #attrs )*
@@ -2869,14 +2881,15 @@ impl CodeGenerator for CompInfo {
 
         if needs_clone_impl {
             result.push(quote! {
-                #( #attrs )*
+                #( #cfg_attrs )*
                 impl #impl_generics_labels Clone for #ty_for_impl {
                     fn clone(&self) -> Self { *self }
                 }
             });
         }
 
         if needs_flexarray_impl {
+            // TODO: Potentially add cfg_attrs
             result.push(self.generate_flexarray(
                 ctx,
                 &canonical_ident,
@@ -2910,7 +2923,7 @@ impl CodeGenerator for CompInfo {
             // non-zero padding bytes, especially when forwards/backwards compatibility is
             // involved.
             result.push(quote! {
-                #( #attrs )*
+                #( #cfg_attrs )*
                 impl #impl_generics_labels Default for #ty_for_impl {
                     fn default() -> Self {
                         #body
@@ -2930,7 +2943,7 @@ impl CodeGenerator for CompInfo {
             let prefix = ctx.trait_prefix();
 
             result.push(quote! {
-                #( #attrs )*
+                #( #cfg_attrs )*
                 impl #impl_generics_labels ::#prefix::fmt::Debug for #ty_for_impl {
                     #impl_
                 }
@@ -2955,7 +2968,7 @@ impl CodeGenerator for CompInfo {
 
                 let prefix = ctx.trait_prefix();
                 result.push(quote! {
-                    #( #attrs )*
+                    #( #cfg_attrs )*
                     impl #impl_generics_labels ::#prefix::cmp::PartialEq for #ty_for_impl #partialeq_bounds {
                         #impl_
                     }
@@ -2965,7 +2978,7 @@ impl CodeGenerator for CompInfo {
 
         if !methods.is_empty() {
             result.push(quote! {
-                #( #attrs )*
+                #( #cfg_attrs )*
                 impl #impl_generics_labels #ty_for_impl {
                     #( #methods )*
                 }