编译.o和.exe的C ++ makefile

Question

My professor didn't give us any information and I cant seem to find a solution with resources online.

We need to create a makefile for a .cpp file. It should compile a .o file, and an executable file. Also a command clean that removes both of these files. This is what I currently have, any help?

List: List.cpp
    g++ List.cpp -o List

List.o: List.cpp
    g++ List.cpp -c -o List.o

clean:
    rm List
    rm List.o

Answer 1

You're doing more work than you need to there.

Usually the executable file is generated from the .o file.

1) Compile the .cpp file to make an .o file.

2) Link the .o file to make an executable file.

# List.o depends on List.cpp
# If List.cpp changes, recompile List.o
List.o: List.cpp
    g++ -c -o List.o List.cpp

# List depends on List.o
# If List.o changes, relink List
List: List.o
    g++ -o List List.o

clean:
    rm List
    rm List.o