diff --git a/CMakeLists.txt b/CMakeLists.txt
index a08cc87c..c8b1c8dc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -35,10 +35,15 @@ else()
                         "-Wsign-conversion" "-Wsign-promo"
                         "-Wstrict-null-sentinel" "-Wstrict-overflow=5"
                         "-Wno-deprecated-declarations") # auto_ptr is OK for now.
-    elseif ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" AND NOT LUABIND_NO_CXX11)
-        # I do not know (a) since when Clang supports this flags and (b) how to
-        # check Clang's version. Use LUABIND_NO_CXX11 manually if you need to.
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -stdlib=libc++")
+    elseif ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
+        add_definitions("-Weverything" "-Wno-shadow" "-Wno-undef"
+                        "-Wno-global-constructors" "-Wno-weak-vtables"
+                        "-Wno-padded" "-Wno-exit-time-destructors")
+        if (NOT LUABIND_NO_CXX11)
+            # I do not know (a) since when Clang supports this flags and (b) how to
+            # check Clang's version. Use LUABIND_NO_CXX11 manually if you need to.
+            add_definitions("-std=c++11" "-Wno-c++98-compat")
+        endif()
     endif ()
 endif()
 
diff --git a/luabind/detail/format_signature.hpp b/luabind/detail/format_signature.hpp
index 38c37f0c..cfd39365 100644
--- a/luabind/detail/format_signature.hpp
+++ b/luabind/detail/format_signature.hpp
@@ -7,20 +7,13 @@
 
 # include <luabind/config.hpp>
 # include <luabind/lua_include.hpp>
+# include <luabind/object_fwd.hpp>
 # include <luabind/typeid.hpp>
 
 # include <boost/mpl/begin_end.hpp>
 # include <boost/mpl/next.hpp>
 # include <boost/mpl/size.hpp>
 
-namespace luabind {
-
-class object;
-class argument;
-template <class Base>
-struct table;
-
-} // namespace luabind
 
 namespace luabind { namespace detail {
 
diff --git a/luabind/object_fwd.hpp b/luabind/object_fwd.hpp
new file mode 100644
index 00000000..dc826961
--- /dev/null
+++ b/luabind/object_fwd.hpp
@@ -0,0 +1,15 @@
+#ifndef LUABIND_OBJECT_FWD_050419_HPP
+#define LUABIND_OBJECT_FWD_050419_HPP
+
+namespace luabind {
+    namespace adl {
+        class object;
+        class argument;
+        template <class Base> struct table;
+    } // namespace adl
+    using adl::object;
+    using adl::argument;
+    using adl::table;
+} // namespace luabind
+
+#endif