-SET(CMAKE_C_FLAGS_PROFILING "-O2")
-SET(CMAKE_CXX_FLAGS_PROFILING "-O2 -std=c++11")
-SET(CMAKE_C_FLAGS_DEBUG "-O0 -g")
-SET(CMAKE_CXX_FLAGS_DEBUG "-O0 -std=c++11 -g")
-SET(CMAKE_C_FLAGS_RELEASE "-O2 -g")
-SET(CMAKE_CXX_FLAGS_RELEASE "-O2 -std=c++11 -g")
-SET(CMAKE_CXX_FLAGS_CCOV "-O0 -std=c++11 -g --coverage")
+SET(EXTRA_FLAGS "-Wall -Wextra")
+SET(CMAKE_C_FLAGS_PROFILING "-O2 ${EXTRA_FLAGS}")
+SET(CMAKE_CXX_FLAGS_PROFILING "-O2 -std=c++11 ${EXTRA_FLAGS}")
+SET(CMAKE_C_FLAGS_DEBUG "-O0 -g ${EXTRA_FLAGS}")
+SET(CMAKE_CXX_FLAGS_DEBUG "-O0 -std=c++11 -g ${EXTRA_FLAGS}")
+SET(CMAKE_C_FLAGS_RELEASE "-O2 -g ${EXTRA_FLAGS}")
+SET(CMAKE_CXX_FLAGS_RELEASE "-O2 -std=c++11 -g ${EXTRA_FLAGS}")
+SET(CMAKE_CXX_FLAGS_CCOV "-O0 -std=c++11 -g --coverage ${EXTRA_FLAGS}")
+
+# Linker flags
+SET(EXTRA_LINKER_FLAGS "-Wl,--as-needed")
+SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${EXTRA_LINKER_FLAGS}")