Add compile option for address sanitizers

CMakeLists.txt

 cmake_minimum_required(VERSION 3.1)
 
 option(APPVEYOR_BUILD "Build on appveyor" OFF)
+option(ASAN "Compile with address sanitizers" OFF)
 
 set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
 
@@ -311,6 +312,10 @@ set(NHEKO_DEPS
     ${TRANSLATION_DEPS}
     ${META_FILES_TO_INCLUDE})
 
+if(ASAN)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=address,undefined")
+endif()
+
 if(APPLE)
     add_executable (nheko ${OS_BUNDLE} ${NHEKO_DEPS})
     target_link_libraries (nheko ${NHEKO_LIBS} Qt5::MacExtras Qt5::Multimedia)