How to write makefile

http://wiki.ubuntu.org.cn/%E8%B7%9F%E6%88%91%E4%B8%80%E8%B5%B7%E5%86%99Makefile:%E4%B9%A6%E5%86%99%E8%A7%84%E5%88%99#.E8.87.AA.E5.8A.A8.E7.94.9F.E6.88.90.E4.BE.9D.E8.B5.96.E6.80.A7

http://blog.youkuaiyun.com/liang13664759/article/details/1771246

 #*********************************************************
 # This makefile is used to create libjia.a library
 #*********************************************************
 #http://blog.youkuaiyun.com/ziliangxiao/article/details/10309927 for understanding the grammar                               
 CC  = gcc                                                                                                              
 CCC = gcc                                                                                                              
 FC = f77                                                                                                               
                                                                                                                        
 SRC = ../../src                                                                                                        
 CFLAGS  = -I./${SRC} $(ARCH_FLAGS)  -DDOSTAT -g                                                                        
 OBJS    = comm.o init.o mem.o syn.o tools.o exit.o  get.o finit.o msg.o load.o                                         
                                                                                                                        
 VPATH   = ./$(SRC) #importantly, tell make where to search the file                                                    
                                                                                                                        
 TARGET  = libjia.a                                                                                                     
                                                                                                                        
 %.d: %.c                                                                                                               
     @echo "Creating $@..."                                                                                             
      $(SHELL) -ec "$(CC) -MM $(CPPFLAGS) $< | sed 's/$*\.o/& $@/g' > $@"                                               
     @echo "\n"                                                                                                         
                                                                                                                        
 %.d: %.f                                                                                                               
     echo "Creating $@..."                                                                                              
     $(SHELL) -ec "$(FC) -c $< | sed ' s/$*\.o/& $@/g' > $@"                                                            
                                                                                                                        
 $(TARGET):$(OBJS)                                                                                                      
     ar rv $(TARGET) $?                                                                                                 
                                                                                                                        
 all:$(TARGET)                                                                                                          
                                                                                                                        
 clean:                                                                                                                 
     rm -f *.[od] $(TARGET)                                                                                             
                                                                                                                        
 include $(OBJS:.o=.d)