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