Add -Wextra

CMakeLists.txt

@@ -68,7 +68,7 @@ foreach(lib screen dom component)
     PRIVATE src
   )
   target_compile_features(${lib} PUBLIC cxx_std_17)
-  target_compile_options(${lib} PRIVATE -Wall)
+  target_compile_options(${lib} PRIVATE -Wall -Werror -Wextra)
 endforeach()
 
 include(GNUInstallDirs)

include/ftxui/component/container.hpp

@@ -27,7 +27,7 @@ class Container : public Component {
   using EventHandler = bool (Container::*)(Event);
   bool VerticalEvent(Event event);
   bool HorizontalEvent(Event event);
-  bool TabEvent(Event event) { return false; }
+  bool TabEvent(Event) { return false; }
   EventHandler event_handler_;
 
   using RenderHandler = Element (Container::*)();

src/ftxui/component/screen_interactive.cpp

@@ -31,7 +31,7 @@ void OnExit(int signal) {
 }
 
 std::function<void()> on_resize = []{};
-void OnResize(int signal) {
+void OnResize(int /* signal */) {
   on_resize();
 }