GCC11 complains a lot about -Wmismatched-new-delete

[Milek7]

Coming GCC 11 introduced new warning, -Wmismatched-new-delete.
It complains a lot in OpenTTD code: (this is short excerpt, there's a lot more similiar warnings)

/home/milek7/ottd2/src/ai/ai_gui.cpp: In function ‘void ShowAIListWindow(CompanyID)’:
/home/milek7/ottd2/src/ai/ai_gui.cpp:280:46: warning: ‘static void Window::operator delete(void*)’ called on pointer returned from a mismatched allocation function [-Wmismatched-new-delete]
  280 |         new AIListWindow(&_ai_list_desc, slot);
      |                                              ^
/home/milek7/ottd2/src/ai/ai_gui.cpp:280:46: note: returned from ‘static void* ZeroedMemoryAllocator::operator new(size_t)’
[ 58%] Building CXX object CMakeFiles/openttd.dir/src/blitter/40bpp_anim.cpp.o
/home/milek7/ottd2/src/ai/ai_gui.cpp: In function ‘void ShowAISettingsWindow(CompanyID)’:
/home/milek7/ottd2/src/ai/ai_gui.cpp:633:54: warning: ‘static void Window::operator delete(void*)’ called on pointer returned from a mismatched allocation function [-Wmismatched-new-delete]
  633 |         new AISettingsWindow(&_ai_settings_desc, slot);
      |                                                      ^
/home/milek7/ottd2/src/ai/ai_gui.cpp:633:54: note: returned from ‘static void* ZeroedMemoryAllocator::operator new(size_t)’
/home/milek7/ottd2/src/ai/ai_gui.cpp: In function ‘void ShowScriptTextfileWindow(TextfileType, CompanyID)’:
/home/milek7/ottd2/src/ai/ai_gui.cpp:673:49: warning: ‘static void Window::operator delete(void*)’ called on pointer returned from a mismatched allocation function [-Wmismatched-new-delete]
  673 |         new ScriptTextfileWindow(file_type, slot);
      |                                                 ^
/home/milek7/ottd2/src/ai/ai_gui.cpp:673:49: note: returned from ‘static void* ZeroedMemoryAllocator::operator new(size_t)’
/home/milek7/ottd2/src/ai/ai_gui.cpp: In function ‘void ShowAIConfigWindow()’:
/home/milek7/ottd2/src/ai/ai_gui.cpp:974:28: warning: ‘static void Window::operator delete(void*)’ called on pointer returned from a mismatched allocation function [-Wmismatched-new-delete]
  974 |         new AIConfigWindow();
      |                            ^
/home/milek7/ottd2/src/ai/ai_gui.cpp:974:28: note: returned from ‘static void* ZeroedMemoryAllocator::operator new(size_t)’
/home/milek7/ottd2/src/ai/ai_gui.cpp: In function ‘Window* ShowAIDebugWindow(CompanyID)’:
/home/milek7/ottd2/src/ai/ai_gui.cpp:1539:75: warning: ‘static void Window::operator delete(void*)’ called on pointer returned from a mismatched allocation function [-Wmismatched-new-delete]
 1539 |                 if (w == nullptr) w = new AIDebugWindow(&_ai_debug_desc, 0);
      |                                                                           ^
/home/milek7/ottd2/src/ai/ai_gui.cpp:1539:75: note: returned from ‘static void* ZeroedMemoryAllocator::operator new(size_t)’

[LordAro]

JGR fix here: JGRennison/OpenTTD-patches@6573a67

[LordAro]

Is this still a thing? I'm getting no warnings with GCC11.1 (I've explicitly set the warning with cmake -DCMAKE_CXX_FLAGS="-Wmismatched-new-delete")

[Milek7]

It was fixed by #9227