基於以上的學習，下面編寫一個基於Hi3520D開發板的程式

工程目錄結構如下

.

├── Components

│   ├──Common

│   │   ├── xx_inc.h

│   │   ├── xx_type.h

│   ├──HAL

│   │   ├── Common

│   │   │   ├── xx_inc_hal.h

│   │   ├── Include

│   │   │   ├── xx_alarm_in.h

│   │   │   ├── xx_alarm_out.h

│   │   │   ├── xx_tm7705.h

│   │   ├── Source

│   │   │   ├── xx_alarm_in.c

│   │   │   ├── xx_alarm_out.c

│   │   │   ├── xx_tm7705.c

│   │   └── Makefile

│   ├──MCU

│   │   ├── Common

│   │   │   ├── xx_inc_mcu.h

│   │   ├── Include

│   │   │   ├── hi35xx_gpio.h

│   │   │   ├── xx_uart.h

│   │   ├── Source

│   │   │   ├── hi35xx_gpio.c

│   │   │   ├── xx_uart.c

│   │  └── Makefile

│   ├──Protocal

│   │   ├── Common

│   │   │   ├── xx_inc_ip.h

│   │   ├── Include

│   │   │   ├── gk_protocal.h

│   │   │   ├── xx_crc.h

│   │   │   ├── xx_protocal.h

│   │   ├── Source

│   │   │   ├── gk_protocal.c

│   │   │   ├── xx_crc.c

│   │   │   ├── xx_protocal.c

│   │  └── Makefile

│   ├──Services

│   │   ├── Common

│   │   │   ├── xx_inc_ip.h

│   │   ├── Include

│   │   │   ├── xx_dbug.h

│   │   │   ├── xx_inifile.h

│   │   │   ├── xx_pthread_mutex.h

│   │   │   ├── xx_socket.h

│   │   │   ├── xx_waiter.h

│   │   ├── Source

│   │   │   ├── xx_dbug.c

│   │   │   ├── xx_inifile.c

│   │   │   ├── xx_pthread_mutex.c

│   │   │   ├── xx_socket.c

│   │   │   ├── xx_waiter.c

│   │  └── Makefile

├── Project

│   ├── main.h

│   ├── main.c

│   ├── Makefile(主)

│   ├──Iot_hornet

│   │   ├── iot_intfc.h

│   │   ├── iot_main.h

│   │   ├── iot_intfc.c

│   │   ├── iot_main.c

│   │   └──Makefile

│   ├──wlan_select

│   │   ├── wlan_main.h

│   │   ├── wlan_main.c

│   │   └── Makefile

├── Object(存放所有目標檔案(.o檔案)的資料夾)

相對來說，子makefiled都是相同，

所做的工作就是把子makefile同目錄下的所有檔案下的.c原始檔全部便宜為相應的.o目標檔案，然後把所有的.o檔案cp到Object目錄下；

#$(shell ls -d */) 命令列印當前目錄下的所有資料夾

DIRS := $(shell ls -d*/) ./

FILES := $(foreachdirs, $(DIRS), $(wildcard $(dirs)*.c))

OBJS := $(patsubst%.c, %.o, $(FILES))

all:$(OBJS)$(OBJSDIR)

#$(OBJS):%.o:%.c

#       $(CC) -c $< -o [email protected] $(CFLAGS)

#依賴一個偽目標，這樣每次編譯時因為ALWAYSMAKE不存在，都會執行命令

$(OBJSDIR):ALWAYSMAKE

         cp $(OBJS) $(OBJSDIR)

.PHONY:clean

clean:

         $(RM) $(OBJS)

.PHONY:ALWAYSMAKE

ALWAYSMAKE:

export WORKDIR :=$(shell pwd)/..

export OBJSDIR :=$(WORKDIR)/Object

export LIBS :=-lpthread -lmpi -ltde -laec -ljpeg -lanr -lresampler -lVoiceEngine

export MPPLIBS :=-L/opt/Hi3520D_SDK_V1.0.5.0/mpp/lib

export CC :=arm-hisiv100nptl-linux-gcc

#標頭檔案路徑

export CFLAGS := \

-I$(WORKDIR)/Components/Common\

-I$(WORKDIR)/Components/HAL/Common\

-I$(WORKDIR)/Components/HAL/Include\

-I$(WORKDIR)/Components/MCU/Common\

-I$(WORKDIR)/Components/MCU/Include\

-I$(WORKDIR)/Components/Protocal/Common\

-I$(WORKDIR)/Components/Protocal/Include\

-I$(WORKDIR)/Components/Services/Common\

-I$(WORKDIR)/Components/Services/Include\

-I$(WORKDIR)/Project/Iot_hornet\

-I$(WORKDIR)/Project/wlan_select\

-I$(WORKDIR)/Project\

-I/opt/Hi3520D_SDK_V1.0.5.0/mpp/include\

-O0 -Wall -g3

RM := rm -f

OBJS := main.o

TARGET := xxproject

$(TARGET):$(OBJS)$(OBJSDIR)

         $(MAKE) -C$(WORKDIR)/Components/Protocal/

         $(MAKE) -C$(WORKDIR)/Components/Services/

         $(MAKE) -C $(WORKDIR)/Components/HAL/

         $(MAKE) -C $(WORKDIR)/Components/MCU/

         $(MAKE) -C $(WORKDIR)/Project/wlan_select/

         $(MAKE) -C$(WORKDIR)/Project/Iot_hornet/

         $(CC) $(MPPLIBS) -o $(TARGET)$(OBJSDIR)/*.o $(CFLAGS) $(LIBS)

#$(OBJS):%.o:%.c

#       $(CC) -c $< -o $(OBJSDIR)/[email protected] $(CFLAGS)

#依賴一個偽目標，這樣每次編譯時因為ALWAYSMAKE不存在，都會執行命令

$(OBJSDIR):ALWAYSMAKE

         cp $(OBJS) $(OBJSDIR)

.PHONY:clean

clean:

         $(MAKE) clean -C$(WORKDIR)/Components/Protocal/

         $(MAKE) clean -C$(WORKDIR)/Components/Services/

         $(MAKE) clean -C$(WORKDIR)/Components/HAL/

         $(MAKE) clean -C$(WORKDIR)/Components/MCU/

         $(MAKE) clean -C $(WORKDIR)/Project/wlan_select/

         $(MAKE) clean -C$(WORKDIR)/Project/Iot_hornet/

         $(RM) $(OBJS) $(TARGET)

         $(RM) $(OBJSDIR)/*.o

.PHONY:ALWAYSMAKE

ALWAYSMAKE: