Update App.hpp (#1206)

Compatible compile option: /GR-

Author: romanholidaypancakes

azure-pipelines.yml

@@ -86,11 +86,11 @@ jobs:
           vmImage: "windows-2025"
           cli11.std: 20
           cli11.options:
-            -DCMAKE_CXX_FLAGS="/EHsc" -DCLI11_DISABLE_EXTRA_VALIDATORS=1
+            -DCMAKE_CXX_FLAGS="/EHsc /GR-" -DCLI11_DISABLE_EXTRA_VALIDATORS=1
         WindowsLatest:
           vmImage: "windows-2025"
           cli11.std: 23
-          cli11.options: -DCMAKE_CXX_FLAGS="/EHsc"
+          cli11.options: -DCMAKE_CXX_FLAGS="/EHsc /GR-"
         Linux17nortti:
           vmImage: "ubuntu-latest"
           cli11.std: 17

include/CLI/App.hpp

@@ -742,7 +742,7 @@ class App {
         auto option_group = std::make_shared<T>(std::move(group_description), group_name, this);
         auto *ptr = option_group.get();
         // move to App_p for overload resolution on older gcc versions
-        App_p app_ptr = std::dynamic_pointer_cast<App>(option_group);
+        App_p app_ptr = std::static_pointer_cast<App>(option_group);
         // don't inherit the footer in option groups and clear the help flag by default
         app_ptr->footer_ = "";
         app_ptr->set_help_flag();