add include-instructions

project/Makefile

@@ -1,23 +1,30 @@
 # Makefile
 CC=gcc
 CFLAGS = -W -Wall -pedantic -std=gnu99 -c
+CPPFLAGS = -I.
 LDFLAGS = -static
 RM = rm -f
 
 TARGET = motor
-OBJECTS = motor.o
+OBJECTS = gpio.o
+HEADERS = $(OBJECTS:.o=.h)
 SOURCES = $(TARGET).c $(OBJECTS:.o=.c)
 
+%.o: %.c
+	$(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@
+
 .PHONY: all clean
 
 all: $(TARGET)
 
 clean:
-	$(RM) $(TARGET) $(OBJECTS)
+	$(RM) $(TARGET) $(TARGET).o $(OBJECTS) depend
 
-$(OBJECTS): $(SOURCES)
-	$(CC) $(CFLAGS) $<
+depend: $(SOURCES) $(HEADERS)
+	$(CC) $(CPPFLAGS) -MM $(SOURCES) > $@
 
-$(TARGET): $(OBJECTS)
-	$(CC) $(LDFLAGS) -o $@ $^
-	$(RM) $(OBJECTS)
+$(TARGET): $(TARGET).o $(OBJECTS)
+	$(CC) $(LDFLAGS) $^ -o $@
+	$(RM) depend $(TARGET).o $(OBJECTS)
+
+include depend