make: implicit rule to link c++ project

Question

I am working my way through a make tutorial. Very simple test projects I am trying to build has only 3 files: ./src/main.cpp ./src/implementation.cpp and

Answer 1

Hmm...

CXX = g++               # Just an example
CXXFLAGS = -Wall -O2    # Just an example

prog: main.o implementation.o
    $(CXX) $(CXXFLAGS) $^ -o $@

main.o: header.hpp
implementation.o: header.hpp

should do the job. Why your variant isn't working is explained in Konrad Rudolph answer