Makefile2

# Universal makefile for single C++ program
#
# Use gcc flag -MMD (user) or -MD (user/system) to generate dependences among source files.
# Use make default rules for commonly used file-name suffixes and make variables names.
#
# % make [ phil ]

########## Variables ##########

CXX = g++					# compiler
CXXFLAGS = -g -std=c++11 -Wall -MMD		# compiler flags
MAKEFILE_NAME = ${firstword ${MAKEFILE_LIST}}	# makefile name

OBJECTS = coursecalc.o				# object files forming executable
EXEC = coursecalc					# executable name

DEPENDS = ${OBJECTS:.o=.d}			# substitute ".o" with ".d"

########## Targets ##########

.PHONY : clean						# not file names

${EXEC} : ${OBJECTS}				# link step
	${CXX} ${CXXFLAGS} $^ -o $@		# additional object files before $^

${OBJECTS} : ${MAKEFILE_NAME}			# OPTIONAL : changes to this file => recompile

-include ${DEPENDS}				# include *.d files containing program dependences

clean :						# remove files that can be regenerated
	rm -f ${DEPENDS} ${OBJECTS} ${EXEC}