How to define rules in the Makefile to compile only that *.cpp files which was modified (and their dependencies), not all *.cpp files

Question

Lets say I have files:

Libs:

• one.cpp, one.h
• two.cpp, two.h
• three.cpp, three.h

Program:

• program.cpp

Answer 1

All you need to do is tell make that the .o file depends on the .cpp file:

%.cpp.o: %.cpp
    g++ -Wall -c -o $@ $<