# Syntax
# <target>: <dependencies>
# 	  <command>
#	  ...

# variables
CXX = g++
CXXFLAGS = -Wall -std=c++11

# standard rule
all: main

# creating main from main.o and hello_world.a
# $@ = target
# $^ = dependencies 
main: main.o hello_world.a
	$(CXX) $(CXXFLAGS) -o $@ $^

# creating archive out of object
# % = filename without ending
# $@ = target
# $^ = dependencies 
%.a: %.o
	ar rcs $@ $^

# creating object out of cpp
# % = filename without ending
# $@ = target
# $^ = dependencies 
%.o: %.cpp
	$(CXX) $(CXXFLAGS) -c -o $@ $^

# remove all objects and archives
clean:
	rm -f *.o *.a main