Allow blocklisting anonymous enums

Author: jschwe

bindgen-tests/tests/expectations/tests/blocklist-anon-enum.rs

@@ -0,0 +1,7 @@
+// bindgen-flags: --blocklist-item 'SHOULD_BE_BLOCKED.*'
+
+enum {
+    SHOULD_BE_BLOCKED_1,
+    SHOULD_BE_BLOCKED_2,
+    SHOULD_BE_BLOCKED_3
+};

bindgen-tests/tests/headers/blocklist-anon-enum.hpp

@@ -3594,6 +3594,18 @@ impl CodeGenerator for Enum {
         let layout = enum_ty.layout(ctx);
         let variation = self.computed_enum_variation(ctx, item);
 
+        // blocklist anonymous enums based on variants.
+        if enum_ty.name().is_none() &&
+            self.is_matching_enum(
+                ctx,
+                &ctx.options().blocklisted_items,
+                item,
+            )
+        {
+            debug!("Blocklisting anonymous enum.");
+            return;
+        }
+
         let repr_translated;
         let repr = match self.repr().map(|repr| ctx.resolve_type(repr)) {
             Some(repr)

bindgen/codegen/mod.rs

@@ -150,7 +150,11 @@ impl Enum {
         Ok(Enum::new(repr, variants))
     }
 
-    fn is_matching_enum(
+    /// Checks if the enum matches any of the regular expressions in `enums`
+    ///
+    /// For anonymous enums, returns true if any of the enum variants matches
+    /// any of the regular expressions in `enums`.
+    pub(crate) fn is_matching_enum(
         &self,
         ctx: &BindgenContext,
         enums: &RegexSet,