CC = gcc
CFLAGS = -O2 -Wall -Werror

EXE = a.out
OBJECTS = main.o work.o

all : $(EXE)

$(EXE) : $(OBJECTS)
    $(CC) $(OBJECTS) -o $(EXE)

%.o : %.c
    $(CC) $(CFLAGS) -c -o $@ $<

clean:
    rm *.o $(EXE)

.PHONY: clean all

# additional rules to take headers into account
main.o: work.h
work.o: work.h