ART: More warnings

Enable -Wno-conversion-null, -Wredundant-decls and -Wshadow in general,
and -Wunused-but-set-parameter for GCC builds.

Change-Id: I81bbdd762213444673c65d85edae594a523836e5
diff --git a/runtime/native/java_lang_reflect_Constructor.h b/runtime/native/java_lang_reflect_Constructor.h
new file mode 100644
index 0000000..7baae97
--- /dev/null
+++ b/runtime/native/java_lang_reflect_Constructor.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_RUNTIME_NATIVE_JAVA_LANG_REFLECT_CONSTRUCTOR_H_
+#define ART_RUNTIME_NATIVE_JAVA_LANG_REFLECT_CONSTRUCTOR_H_
+
+#include <jni.h>
+
+namespace art {
+
+void register_java_lang_reflect_Constructor(JNIEnv* env);
+
+}  // namespace art
+
+#endif  // ART_RUNTIME_NATIVE_JAVA_LANG_REFLECT_CONSTRUCTOR_H_