[Makefile][rule explain] Makefile rule explain

[Makefile][rule explain] Makefile rule explain



%.o : %.c

         $(CC) -c $(CFLAGS) $(CPPFLAGS) $< -o $@

%.o

% like *



$< : substitute all file to match document

ex : %.c

abc.c       bcd.c    xxx.c

$@ : substitute all file to match target

ex : %.o

abc.o      bcd.o     xxx.o