Allow generating hidden visibility functions

Author: chertov

bindgen/ir/function.rs

@@ -730,7 +730,11 @@ impl ClangSubItemParser for Function {
 
         debug!("Function::parse({cursor:?}, {:?})", cursor.cur_type());
         let visibility = cursor.visibility();
-        if visibility != CXVisibility_Default {
+        let allow_hidden = context.options().generate_hidden_functions &&
+            (visibility == CXVisibility_Hidden ||
+                visibility == CXVisibility_Protected);
+
+        if visibility != CXVisibility_Default && !allow_hidden {
             return Err(ParseError::Continue);
         }
         if cursor.access_specifier() == CX_CXXPrivate &&

bindgen/options/mod.rs

@@ -2329,4 +2329,16 @@ options! {
         },
         as_args: "--generate-private-functions",
     },
+    /// Whether to allow generating functions that are marked with hidden or protected visibility.
+    generate_hidden_functions: bool {
+        methods: {
+            /// Set whether to generate functions that are not externally visible according to clang.
+            pub fn generate_hidden_functions(mut self, doit: bool) -> Self {
+                self.options.generate_hidden_functions = doit;
+                self
+            }
+
+        },
+        as_args: "--generate-hidden-functions",
+    },
 }