gistfile1.mak

# Some pre-defined variables of make
# 
#	  $? - updated  dependencies
#	  $@ - target value
#	  $< - first dependencie
#	  $^ - all dependencies, seperated with space
#	  $* - target name without extension
#	  
CC	= arm-linux-gnueabihf-gcc
AS	= arm-linux-gnueabihf-as
CFLAGS	= -O2 -ggdb -Wall
LDFLAGS = -fno-stack-protector

objects	= example2.o multiply.o

# 1. The final target, and let make search for example2
default: example2

.PHONY: default clean clobber

# 2. Find example2, and it depends on example2.o and multiply.o.
# 6. All dependencies make, compile - assemble - link -> executable.    
#	  - Until the link moment, extern function multiply(), multiplyadd(), multiplysub() 's address
#	    be bound.
example2: $(objects)
	$(CC) -o $@ $^

# 3. Find the dependency to make example2.o, but does't know the rule.
example2.o: example2.c

# 4. Find the rules to make all .o file, example2.o, so
#    - example2.o compiled
%.o: %.c
	$(CC) -c $(CFLAGS) $(LDFLAGS) -o $@ $<

# 5. Find the rule to make multiply.o
%.o: %.s
	$(AS) -o $@ $<
clean:
	rm -f $(objects) example2

qemu: example2
	qemu-arm -L /usr/arm-linux-gnueabihf ./example2