diff --git a/include/boost/openmethod/core.hpp b/include/boost/openmethod/core.hpp
index 31c72eb..8b5ede9 100644
--- a/include/boost/openmethod/core.hpp
+++ b/include/boost/openmethod/core.hpp
@@ -104,7 +104,8 @@ struct is_unambiguous_accessible_base_of : std::is_base_of<Base, Derived> {
     static_assert(
         std::is_base_of_v<Base, Derived> ==
             std::is_convertible_v<Derived&, Base&>,
-        "class must be an accessible unambiguous base, repeated inheritance is not "
+        "class must be an accessible unambiguous base, repeated inheritance is "
+        "not "
         "supported");
 };
 
diff --git a/include/boost/openmethod/default_registry.hpp b/include/boost/openmethod/default_registry.hpp
index fd9314c..38ad1b9 100644
--- a/include/boost/openmethod/default_registry.hpp
+++ b/include/boost/openmethod/default_registry.hpp
@@ -37,8 +37,7 @@ namespace boost::openmethod {
 //! including those pulled from libraries.
 struct default_registry
     : registry<
-          policies::std_rtti, policies
-          ::vptr_vector,
+          policies::std_rtti, policies ::vptr_vector,
           policies::fast_perfect_hash, policies::default_error_handler,
           policies::stderr_output
 #ifdef BOOST_OPENMETHOD_ENABLE_RUNTIME_CHECKS
diff --git a/include/boost/openmethod/policies/fast_perfect_hash.hpp b/include/boost/openmethod/policies/fast_perfect_hash.hpp
index 890835a..c04bc38 100644
--- a/include/boost/openmethod/policies/fast_perfect_hash.hpp
+++ b/include/boost/openmethod/policies/fast_perfect_hash.hpp
@@ -150,7 +150,7 @@ struct fast_perfect_hash : type_hash {
         //! arguments.
         //! @param options Zero or more option objects.
         template<class... Options>
-        static auto finalize(std::tuple<Options...> opts) -> void {
+        static auto finalize(std::tuple<Options...>) -> void {
             detail::fast_perfect_hash_control<Registry>.clear();
         }
     };
diff --git a/include/boost/openmethod/policies/vptr_map.hpp b/include/boost/openmethod/policies/vptr_map.hpp
index a534420..64b24e2 100644
--- a/include/boost/openmethod/policies/vptr_map.hpp
+++ b/include/boost/openmethod/policies/vptr_map.hpp
@@ -48,7 +48,7 @@ class vptr_map : public vptr {
         template<class ForwardIterator, class... Options>
         static void initialize(
             ForwardIterator first, ForwardIterator last,
-            std::tuple<Options...> opts) {
+            std::tuple<Options...>) {
             decltype(vptrs) new_vptrs;
 
             for (auto iter = first; iter != last; ++iter) {
diff --git a/include/boost/openmethod/preamble.hpp b/include/boost/openmethod/preamble.hpp
index a4014b0..055cfbd 100644
--- a/include/boost/openmethod/preamble.hpp
+++ b/include/boost/openmethod/preamble.hpp
@@ -112,7 +112,7 @@ template<class Registry>
 template<class R>
 std::size_t odr_check<Registry>::inc = count++;
 
-}
+} // namespace detail
 
 //! Registry not initialized
 struct not_initialized : openmethod_error {
diff --git a/test/Jamfile b/test/Jamfile
index 370001e..5eecf77 100644
--- a/test/Jamfile
+++ b/test/Jamfile
@@ -23,9 +23,10 @@ project
 
     <warnings>extra
 
-    # <toolset>msvc:<warnings-as-errors>on
-    # <toolset>gcc:<warnings-as-errors>on
-    # <toolset>clang:<warnings-as-errors>on
+    <toolset>msvc:<warnings-as-errors>on
+    <toolset>gcc:<warnings-as-errors>on
+    <toolset>clang,<os>!NT:<warnings-as-errors>on
+    # !NT because it causes errors when builting unit-test
   ;
 
 alias unit_test_framework
diff --git a/test/compile_fail_non_polymorphic_virtual_ptr.cpp b/test/compile_fail_non_polymorphic_virtual_ptr.cpp
index 8dc1c6d..8d836f7 100644
--- a/test/compile_fail_non_polymorphic_virtual_ptr.cpp
+++ b/test/compile_fail_non_polymorphic_virtual_ptr.cpp
@@ -10,6 +10,7 @@ struct Cat {};
 int main() {
     Cat felix;
     boost::openmethod::virtual_ptr<Cat> p(felix);
+    (void)p;
 
     return 0;
 }
diff --git a/test/compile_fail_virtual_parameter_private_base_core.cpp b/test/compile_fail_virtual_parameter_private_base_core.cpp
index 7474e23..5440a07 100644
--- a/test/compile_fail_virtual_parameter_private_base_core.cpp
+++ b/test/compile_fail_virtual_parameter_private_base_core.cpp
@@ -24,8 +24,8 @@ struct poke;
 auto poke_cat(virtual_ptr<Cat>) -> void {
 }
 
-BOOST_OPENMETHOD_REGISTER(method<poke, void(virtual_ptr<Animal>)>::override<poke_cat>);
-
+BOOST_OPENMETHOD_REGISTER(
+    method<poke, void(virtual_ptr<Animal>)>::override<poke_cat>);
 
 int main() {
 }
diff --git a/test/test_class_registration.cpp b/test/test_class_registration.cpp
index 326aec6..55b39f8 100644
--- a/test/test_class_registration.cpp
+++ b/test/test_class_registration.cpp
@@ -41,7 +41,6 @@ BOOST_AUTO_TEST_CASE(unknown_class_overrider) {
 
 } // namespace TEST_NS
 
-
 namespace TEST_NS {
 
 struct registry : test_registry_<__COUNTER__>::with<
@@ -62,7 +61,6 @@ BOOST_AUTO_TEST_CASE(missing_base_class) {
 
 } // namespace TEST_NS
 
-
 namespace TEST_NS {
 
 struct registry : test_registry_<__COUNTER__>::with<
diff --git a/test/test_dispatch.cpp b/test/test_dispatch.cpp
index 6c7e66e..780367f 100644
--- a/test/test_dispatch.cpp
+++ b/test/test_dispatch.cpp
@@ -340,10 +340,9 @@ BOOST_AUTO_TEST_CASE(simple) {
         BOOST_TEST(
             !detail::vptr_vector_vptrs<test_registry::registry_type>.empty());
         test_registry::finalize();
-        static_assert(
-            detail::has_finalize_aux<
-                void,
-                test_registry::policy<policies::vptr>, std::tuple<>>::value);
+        static_assert(detail::has_finalize_aux<
+                      void, test_registry::policy<policies::vptr>,
+                      std::tuple<>>::value);
         BOOST_TEST(
             detail::vptr_vector_vptrs<test_registry::registry_type>.empty());
     }
diff --git a/test/test_inplace_vptr.cpp b/test/test_inplace_vptr.cpp
index 39b0304..87abf77 100644
--- a/test/test_inplace_vptr.cpp
+++ b/test/test_inplace_vptr.cpp
@@ -43,7 +43,9 @@ struct Pet : bom::inplace_vptr_base<Pet> {
     std::ostream& os;
 };
 
-struct DomesticCat : Cat, Pet, bom::inplace_vptr_derived<DomesticCat, Cat, Pet> {
+struct DomesticCat : Cat,
+                     Pet,
+                     bom::inplace_vptr_derived<DomesticCat, Cat, Pet> {
     explicit DomesticCat(std::ostream& os);
     ~DomesticCat();
 };
diff --git a/test/test_n2216.cpp b/test/test_n2216.cpp
index 38fb536..6b27fbc 100644
--- a/test/test_n2216.cpp
+++ b/test/test_n2216.cpp
@@ -45,8 +45,9 @@ BOOST_OPENMETHOD_OVERRIDE(
     return std::make_unique<matrix>();
 }
 
-static_assert(std::is_same_v<
-              detail::virtual_type<std::unique_ptr<matrix>, test_registry>, matrix>);
+static_assert(
+    std::is_same_v<
+        detail::virtual_type<std::unique_ptr<matrix>, test_registry>, matrix>);
 
 BOOST_AUTO_TEST_CASE(covariant_return_type) {
     auto compiler = boost::openmethod::initialize<test_registry>(n2216());
diff --git a/test/test_rolex.cpp b/test/test_rolex.cpp
index 3f5970b..36cc39d 100644
--- a/test/test_rolex.cpp
+++ b/test/test_rolex.cpp
@@ -35,7 +35,8 @@ struct Taxi : Expense {};
 struct PrivateJet : Expense {};
 
 BOOST_OPENMETHOD_CLASSES(
-    Role, Employee, Manager, Founder, Expense, Public, Bus, Metro, Taxi, PrivateJet);
+    Role, Employee, Manager, Founder, Expense, Public, Bus, Metro, Taxi,
+    PrivateJet);
 
 BOOST_OPENMETHOD(pay, (virtual_ptr<Employee>), double);
 BOOST_OPENMETHOD(
diff --git a/test/test_runtime_errors.cpp b/test/test_runtime_errors.cpp
index 333551c..570ab5d 100644
--- a/test/test_runtime_errors.cpp
+++ b/test/test_runtime_errors.cpp
@@ -194,7 +194,7 @@ BOOST_AUTO_TEST_CASE(bad_call) {
 }
 
 BOOST_AUTO_TEST_CASE(bad_call_type_ids) {
-    auto report = initialize<registry>().report;
+    initialize<registry>();
     registry::capture capture;
 
     try {
diff --git a/test/test_shared_virtual_ptr_value_semantics.cpp b/test/test_shared_virtual_ptr_value_semantics.cpp
index d4d0db4..75b4baa 100644
--- a/test/test_shared_virtual_ptr_value_semantics.cpp
+++ b/test/test_shared_virtual_ptr_value_semantics.cpp
@@ -68,7 +68,7 @@ BOOST_AUTO_TEST_CASE_TEMPLATE(
         BOOST_TEST(p.get() == snoopy.get());
         BOOST_TEST(p.vptr() == Registry::template static_vptr<Dog>);
 
-        p = p;
+        p = *&p;
         BOOST_TEST(p.get() == snoopy.get());
         BOOST_TEST(p.vptr() == Registry::template static_vptr<Dog>);
 
@@ -294,7 +294,7 @@ BOOST_AUTO_TEST_CASE(cast_shared_ptr_lvalue_reference) {
 
 bool cast_moves() {
     std::shared_ptr<Animal> animal = std::make_shared<Dog>();
-    std::static_pointer_cast<Dog>(animal);
+    (void) std::static_pointer_cast<Dog>(animal);
 
     return animal.get() == nullptr;
 }