Makefile example

For example, consider a makefile to maintain the make command itself. The code for make is spread over a number of C language source files and has a yacc grammar. An example of the makefile follows:

   # makefile for the make command
   

   FILES = Makefile defs.h main.c doname.c misc.c files.c dosys.c gram.y
   OBJECTS = main.o doname.o misc.o files.o dosys.o gram.o
   LIBES= -lld
   LINT = lint -p
   CFLAGS = -O
   LP = /usr/bin/lp
   

   make:  $(OBJECTS)
           $(CC) $(CFLAGS) $(OBJECTS) $(LIBES) -o make
           @size make
   

   $(OBJECTS):  defs.h
   

   clean:
           -rm *.o gram.c
   

   install:
           @size make /usr/bin/make
           cp make /usr/bin/make && rm make
   

   lint :  dosys.c doname.c files.c main.c misc.c gram.c
           $(LINT) dosys.c doname.c files.c main.c misc.c \
           gram.c

The following output results from typing make in a directory containing only the source and makefiles:

   cc  -O -c main.c
   cc  -O -c doname.c
   cc  -O -c misc.c
   cc  -O -c files.c
   cc  -O -c dosys.c
   yacc  gram.y
   mv y.tab.c gram.c
   cc  -O -c gram.c
   cc  main.o doname.o misc.o files.o dosys.o gram.o -lld -o make
   13188 + 3348 + 3044 = 19580