test: check attribute/derive ordering

Cargo.toml

@@ -42,6 +42,7 @@ quickcheck = "1.0"
 quote = { version = "1", default-features = false }
 regex = { version = "1.5.3", default-features = false }
 rustc-hash = "2.1.0"
+serde = { version = "1", features = ["derive"] }
 shlex = "1"
 similar = "2.2.1"
 syn = "2.0"

bindgen-tests/tests/expectations/Cargo.toml

@@ -15,6 +15,7 @@ edition.workspace = true
 block.workspace = true
 libloading.workspace = true
 objc.workspace = true
+serde.workspace = true
 
 # Both of these sections need to be copied here from the workspace because
 # Cargo currently does not allow overriding workspace settings in a member

bindgen-tests/tests/headers/derive-and-attribute-order.h

@@ -0,0 +1,7 @@
+// bindgen-flags: --no-layout-tests
+// bindgen-parse-callbacks: derive-uppercase-serialize=color
+typedef struct {
+    int red;
+    int green;
+    int blue;
+} color;

bindgen-tests/tests/parse_callbacks/mod.rs

@@ -146,6 +146,27 @@ impl ParseCallbacks for WrapAsVariadicFn {
     }
 }
 
+#[derive(Debug)]
+struct DeriveTransparentSerialize(String);
+
+impl ParseCallbacks for DeriveTransparentSerialize {
+    fn add_derives(&self, info: &DeriveInfo<'_>) -> Vec<String> {
+        if info.name == &self.0 {
+            vec!["serde::Serialize".to_owned()]
+        } else {
+            vec![]
+        }
+    }
+
+    fn add_attributes(&self, info: &AttributeInfo<'_>) -> Vec<String> {
+        if info.name == &self.0 {
+            vec!["#[serde(rename_all = \"UPPERCASE\")]".to_owned()]
+        } else {
+            vec![]
+        }
+    }
+}
+
 pub fn lookup(cb: &str) -> Box<dyn ParseCallbacks> {
     match cb {
         "enum-variant-rename" => Box::new(EnumVariantRename),
@@ -155,7 +176,11 @@ pub fn lookup(cb: &str) -> Box<dyn ParseCallbacks> {
         "wrap-as-variadic-fn" => Box::new(WrapAsVariadicFn),
         "type-visibility" => Box::new(TypeVisibility),
         call_back => {
-            if let Some(prefix) =
+            if let Some(name) =
+                call_back.strip_prefix("derive-uppercase-serialize=")
+            {
+                Box::new(DeriveTransparentSerialize(name.to_owned()))
+            } else if let Some(prefix) =
                 call_back.strip_prefix("remove-function-prefix-")
             {
                 let lnopc = RemovePrefixParseCallback::new(prefix);