几个makefile文件的例子

程序在不同路径
A

Main:Main.o Manager.o Reader.o Book.o
    g++ Main.o Parts/Manager.o Parts/Reader.o Parts/Book.o -o Main
Main.o:Main.cpp
    g++ Main.cpp -c -Wall -g -o Main.o
Manager.o:
    cd Parts;make
Reader.o:
    cd Parts;make
Book.o:
    cd Parts;make
clean:
    rm *.o Main  -rf
clean_o:
    rm *.o 

B

Manager.o:Manager.cpp Book.o Reader.o
    g++ -c Manager.cpp -Wall -g Book.o Reader.o -o Manager.o
Reader.o:Reader.cpp
    g++ -c Reader.cpp -Wall -g -o Reader.o
Book.o:Book.cpp 
    g++ -c Book.cpp -Wall -g -o Book.o
clean:
    rm *.o Main  -rf
clean_o:
    rm *.o 

# g++ -o Main Main.cpp Parts/Book.cpp Parts/Manager.cpp Parts/Reader.cpp

相同路径

Main:Main.o Time.o
    g++ Main.o Time.o -o Main
Main.o:Main.cpp
    g++ Main.cpp -c -Wall -g -o Main.o
Time.o:Time.cpp
    g++ Time.cpp -c -Wall -g -o Time.o
clean:
    rm *.o Main  -rf