Makefile demo2

参考：https://blog.youkuaiyun.com/pyt1234567890/article/details/109597353

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# eric
######################################

## 指定编译工具
CC	= gcc
CPP	= g++
RM	= rm -rf

## 源文件路径(默认检索3层)
SRC_PATH	:= ./src
DIRS	:= $(shell find $(SRC_PATH) -maxdepth 3 -type d)

## 目标文件名称
TARGET	:= main

## 获取所有.c文件路径
SRCS	+= $(foreach dir, $(DIRS), $(wildcard $(dir)/*.c)) 
SRCPPS	+= $(foreach dir, $(DIRS), $(wildcard $(dir)/*.cpp))

## 所有对应目标文件
OBJS	:= $(SRCS:.c=.o) $(SRCPPS:.cpp=.o)

## 所有用到的库
LIBS	:= pthread m  # mbedtls mbedcrypto mbedx509

## 指定头文件路径
INCLUDE_PATH	:= . $(DIRS) #/usr/local/include/opencv4/

## 指定库文件路径
LIB_PATH	:= /lib /usr/local/lib #./libmbedtls

## 编译参数初始化
CFLAGS		:= -g -O3 -pthread #-Wall

## 加载头文件路径
CFLAGS		+= $(foreach dir, $(INCLUDE_PATH), -I$(dir))

## 加载库文件路径 pkg-config指定该库的头文件和库文件路径
CFLAGS 		+=  `pkg-config --cflags --libs opencv` 
CFLAGS 		+=  `pkg-config --cflags --libs zbar` 

LDFLAGS		+= $(foreach libdir, $(LIB_PATH), -L$(libdir))

## 加载库文件
LDFLAGS 	+= $(foreach lib, $(LIBS), -l$(lib))


.PHONY:all

all: $(TARGET) 
 
$(TARGET) :$(OBJS)
	@$(CPP) $(CFLAGS) -o $@ $(OBJS) $(LDFLAGS)
	@#$(RM) $(OBJS)
	@echo =============================
	@echo $(TARGET) ok

%.o	: %.c
	@echo srcs=$(SRCS)
	@echo $@...
	@$(CC) -c $(CFLAGS) $< -o $@

%.o	: %.cpp
	@echo srcpps=$(SRCPPS)
	@echo LDFLAGS=$(LDFLAGS)
	@echo OBJS=$(OBJS)
	@echo $@...
	@$(CPP) -c $(CFLAGS) $< -o $@ 

# %.o	: %.S
#     $(CC) -c $(CFLAGS) $< -o $@
 
.PHONY:clean
clean:
	$(RM) $(OBJS) $(TARGET)