makefile 中定义宏位置需要注意一下

 1 CUR_DIR = $(shell pwd) 2  3 CFLAGS = -g -Wall 4 GCC = gcc 5 GXX = g++ 6  7 TARGET = exe.out 8  9 SRC_FILES += $(shell find $(CUR_DIR) -name *.cc) \10           += $(shell find $(CUR_DIR) -name *.cpp)11 12 OBJS = fatal-impl.o log.o13 14 INCLUDE += -I.15 RM = rm -f16 17 LINK = 18 CFLAGS = -DNS3_LOG_ENABLE -g -Wall -O019 20 all: $(OBJS) test.o21     $(GXX) $(CFLAGS) $^ -o $(TARGET) $(LINK)22 23 test.o: test.cpp24     $(GXX) -c $(CFLAGS) $^ -o $@25     26 $(OBJS): %.o : %.cc 27     $(GCC) -c $(CFLAGS) $(INCLUDE) $< -o $@28 29 .PHONY : clean30 clean: 31     $(RM) $(OBJS)32     $(RM) $(TARGET)