for a few warnings more

Author: jll63

CMakeLists.txt

@@ -32,6 +32,10 @@ if(MSVC)
   add_compile_options(/EHsc /FAs)
 endif()
 
+if(GCC)
+  add_compile_options(-fPIC -fvisibility=hidden -Wno-deprecated-declarations -Wall -Wextra)
+endif()
+
 if(BUILD_TESTING)
   message(STATUS "Building tests")
   include(CTest)

include/boost/openmethod/compiler.hpp

@@ -1077,7 +1077,7 @@ void compiler<Policy>::write_global_data() {
 
     Policy::dispatch_data.resize(dispatch_data_size);
     auto gv_first = Policy::dispatch_data.data();
-    auto gv_last = gv_first + Policy::dispatch_data.size();
+    [[maybe_unused]] auto gv_last = gv_first + Policy::dispatch_data.size();
     auto gv_iter = gv_first;
 
     ++trace << "Initializing multi-method dispatch tables at " << gv_iter

include/boost/openmethod/with_vptr.hpp

@@ -113,15 +113,15 @@ class with_vptr_aux<Class, Base, false> : with_vptr_derived {
 } // namespace detail
 
 template<typename...>
-struct with_vptr;
+class with_vptr;
 
 template<class Class>
-struct with_vptr<Class>
-    : detail::with_vptr_aux<Class, BOOST_OPENMETHOD_DEFAULT_POLICY, true> {};
+class with_vptr<Class> : public detail::with_vptr_aux<
+                             Class, BOOST_OPENMETHOD_DEFAULT_POLICY, true> {};
 
 template<class Class, class Other>
-struct with_vptr<Class, Other>
-    : detail::with_vptr_aux<Class, Other, detail::is_policy<Other>> {};
+class with_vptr<Class, Other>
+    : public detail::with_vptr_aux<Class, Other, detail::is_policy<Other>> {};
 
 template<class Class, class Base1, class Base2, class... MoreBases>
 class with_vptr<Class, Base1, Base2, MoreBases...> : detail::with_vptr_derived {