Makefile for one cpp file

Makefile

TARGET = main
CXXFLAGS = -g -std=c++17 -O2
OBJS = ${TARGET}.o

main: ${OBJS}
        ${CXX} ${CXXFLAGS} $< -o $@

%.o : %.cpp
        ${CXX} -c ${CXXFLAGS} $< -o $@

.PHONY: clean
clean:
        ${RM} *.o *~ ${TARGET}

prerequisite: cpp file name is main.cpp
make to compile
make clean to remove output files