有時候，我們在開發的時候需要將本次工程的程式碼分成多個子目錄來編寫，但是在Makefile的編寫上卻是個問題，下面我就教大家怎麼構建帶有子資料夾的原始碼目錄的自動掃描編譯

下面這張圖是我的檔案樹

這裡面src目錄下是我的原始碼，我將功能程式碼分成了三個子模組，分別為test1, test2, test3， 呼叫這三個子模組的是main.cpp檔案，下面我將這三個子模組的程式碼

//  src/test1/test1.h
#ifndef __TEST1_H__
#define __TEST1_H__
int test1();
#endif //__TEST1_H__

// src/test1/test1.cpp
#include "test1.h"

int test1() {
	return 1;	
}

<pre name="code" class="cpp">//  src/test2/test2.h
#ifndef __TEST2_H__
#define __TEST2_H__
int test2();
#endif //__TEST2_H__

// src/test2/test2.cpp
#include "test2.h"

int test2() {
	return 2;	
}
 

//  src/test3/test3.h
#ifndef __TEST3_H__
#define __TEST3_H__
int test3();
#endif //__TEST3_H__

// src/test3/test3.cpp
#include "test3.h"

int test3() {
	return 3;	
}

// src/main.cpp
#include <iostream>
#include "test1/test1.h"
#include "test2/test2.h"
#include "test3/test3.h"

using namespace std;

int main() {
    cout << "test1()" << test1() << endl;
    cout << "test2()" << test2() << endl;
    cout << "test3()" << test3() << endl;
}

Makefile遍歷的核心程式碼如下：

SRC_PATH = ./src
DIRS = $(shell find $(SRC_PATH) -maxdepth 3 -type d)

# 為了更大幅度的支援專案的搭建，將三種檔案格式的字尾都單獨便利到變數中
SRCS_CPP += $(foreach dir, $(DIRS), $(wildcard $(dir)/*.cpp))
SRCS_CC += $(foreach dir, $(DIRS), $(wildcard $(dir)/*.cc))
SRCS_C += $(foreach dir, $(DIRS), $(wildcard $(dir)/*.c))

OBJS_CPP = $(patsubst %.cpp, %.o, $(SRCS_CPP))
OBJS_CC = $(patsubst %.cc, %.o, $(SRCS_CC))
OBJS_C = $(patsubst %.c, %.o, $(SRCS_C))
 

下面是Makefile的全部檔案  ---- 對於其他出現的語法，請參考我寫的請他部落格，還是不懂，請留言評論

[[email protected] makefile]# cat Makefile 
CROSS = 
CC = $(CROSS)gcc
CXX = $(CROSS)g++
DEBUG = 
CFLAGS = $(DEBUG) -Wall -c
MV = mv -f
RM = rm -rf
LN = ln -sf

TARGET = classify

TOP_PATH = $(shell pwd)
SRC_PATH = $(TOP_PATH)/src
MOD_PATH = $(TOP_PATH)/modules
MOD_LIB_PATH = $(MOD_PATH)/lib
MOD_INC_PATH = $(MOD_PATH)/include
DIRS = $(shell find $(SRC_PATH) -maxdepth 3 -type d)
FILES = $(foreach dir, $(DIRS), $(wildcard $(dir)/*.cpp))

##########################################################
# modules
##########################################################
modules = 
MODULES_PATH = $(foreach m, $(modules), $(MOD_PATH)/$(m))

##########################################################
# srcs
##########################################################
SRCS_CPP += $(foreach dir, $(DIRS), $(wildcard $(dir)/*.cpp))
SRCS_CC += $(foreach dir, $(DIRS), $(wildcard $(dir)/*.cc))
SRCS_C += $(foreach dir, $(DIRS), $(wildcard $(dir)/*.c))

##########################################################
# objs
##########################################################
OBJS_CPP = $(patsubst %.cpp, %.o, $(SRCS_CPP))
OBJS_CC = $(patsubst %.cc, %.o, $(SRCS_CC))
OBJS_C = $(patsubst %.c, %.o, $(SRCS_C))

##########################################################
# paths
##########################################################
INC_PATH += -I$(MOD_INC_PATH)
INC_PATH += -I$(MOD_PATH)
LIB_PATH += -L$(TOP_PATH)/lib
LIB_PATH += -L$(MOD_LIB_PATH)

##########################################################
# libs
##########################################################

##########################################################
# building
##########################################################
all:$(TARGET)

$(TARGET) : $(OBJS_CPP) $(OBJS_CC) $(OBJS_C)
	@ for i in $(MODULES_PATH); \
	do \
	make -C $$i; \
	done

	@ $(CXX) $^ -o [email protected] $(LIB_PATH) $(LIBS)
	@ echo Create $(TARGET) ok...

$(OBJS_CPP):%.o : %.cpp
	$(CXX) $(CFLAGS) $< -o [email protected] $(INC_PATH)

$(OBJS_CC):%.o : %.cc
	$(CXX) $(CFLAGS) $< -o [email protected] $(INC_PATH)

$(OBJS_C):%.o : %.c
	$(CXX) $(CFLAGS) $< -o [email protected] $(INC_PATH)

.PHONY : clean
clean:
	@ $(RM) $(TARGET) $(OBJS_CPP) $(OBJS_CC) $(OBJS_C)
	@ for i in $(MODULES_PATH); \
	do \
	make clean -C $$i; \
	done
	@echo clean all...