refactoring fixes

driver/stub/Makefile

@@ -0,0 +1,20 @@
+CXXFLAGS += -std=c++11 -O3 -Wall -Wextra -pedantic -Wfatal-errors
+#CXXFLAGS += -std=c++11 -g -O0 -Wall -Wextra -pedantic -Wfatal-errors
+
+CXXFLAGS += -I../include -I../../runtime
+
+CXXFLAGS += -fPIC
+
+LDFLAGS += -shared -pthread
+
+SRCS = vortex.cpp ../common/vx_utils.cpp
+
+PROJECT = libvortex.so
+
+all: $(PROJECT)
+
+$(PROJECT): $(SRCS) 
+	$(CXX) $(CXXFLAGS) $^ $(LDFLAGS) -o $@
+
+clean:
+	rm -rf $(PROJECT) obj_dir