Use Cmake's build types to drive -g / -O2 flags

CMakeLists.txt

@@ -15,7 +15,7 @@ AUX_SOURCE_DIRECTORY(${UTILS_DIR} UTILS_FILES)
 
 include_directories(${COMPILER_DIR} ${RUNTIME_DIR} ${SHARED_DIR} ${UTILS_DIR})
 
-SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O2 -std=c11")
+SET(CMAKE_C_STANDARD 11)
 
 SET(SRC_FILES ${COMPILER_FILES} ${RUNTIME_FILES} ${SHARED_FILES} ${UTILS_FILES})