Improve debug build flags in CMakeLists.txt

CMakeLists.txt

@@ -8,8 +8,9 @@ set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
 
 set(CMAKE_C_FLAGS "-O2 -Wall -std=gnu11 -D_GNU_SOURCE -fPIC" )
+set(CMAKE_C_FLAGS_DEBUG "-O0 -fsanitize=undefined -fsanitize=address -g3" )
 set(CMAKE_CXX_FLAGS "-fstack-protector -fstack-protector-all -Wall -std=gnu++11 -D_GNU_SOURCE" )
-set(CMAKE_CXX_FLAGS_DEBUG "-O2 -Wall -ggdb" )
+set(CMAKE_CXX_FLAGS_DEBUG "-O0 -Wall -ggdb -fsanitize=undefined -fsanitize=address -g3" )
 set(CMAKE_CXX_FLAGS_RELEASE "-Os -Wall" )