makefile 中定义宏位置需要注意一下

 CUR_DIR = $(shell pwd)

 CFLAGS = -g -Wall

 GCC = gcc

 GXX = g++

 TARGET = exe.out

 SRC_FILES += $(shell find $(CUR_DIR) -name *.cc) \

           += $(shell find $(CUR_DIR) -name *.cpp)

 OBJS = fatal-impl.o log.o

 INCLUDE += -I.

 RM = rm -f

 LINK =

 CFLAGS = -DNS3_LOG_ENABLE -g -Wall -O0

 all: $(OBJS) test.o

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

 test.o: test.cpp

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

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

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

 .PHONY : clean

 clean:

     $(RM) $(OBJS)

     $(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