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.o

13 

14 INCLUDE += -I.

15 RM = rm -f

16 

17 LINK = 

18 CFLAGS = -DNS3_LOG_ENABLE -g -Wall -O0

19 

20 all: $(OBJS) test.o

21     $(GXX) $(CFLAGS) $^ -o $(TARGET) $(LINK)

22 

23 test.o: test.cpp

24     $(GXX) -c $(CFLAGS) $^ -o $@

25     

26 $(OBJS): %.o : %.cc 

27     $(GCC) -c $(CFLAGS) $(INCLUDE) $< -o $@

28 

29 .PHONY : clean

30 clean: 

31     $(RM) $(OBJS)

32     $(RM) $(TARGET)

上面-D选项放在-c选项前宏定义不起作用，修改放在-c选项后面后ok，

相当于在需要编译的文件最开始位置添加#define xxx