PRJSRC=a.c hello.c
OPTLEVEL=s
CC=gcc
REMOVE=rm -f

PROJECTNAME=test
TRG=$(PROJECTNAME).out

CFLAGS=$(CUSTOM_CFLAGS) -I. $(INC) -O$(OPTLEVEL)

CFILES=$(filter %.c, $(PRJSRC))
OBJDEPS=$(CFILES:.c=.o)

.SUFFIXES : .c .h

all: $(TRG)

debug: CUSTOM_CFLAGS:=-DTEST
debug: $(TRG)

clean:
	$(REMOVE) $(TRG)
	$(REMOVE) $(OBJDEPS)

$(TRG): $(OBJDEPS)
	$(CC) $(OBJDEPS) $(LDFLAGS) -o $(TRG)

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