rule1

3个头文件 8个C文件
———v1——
edit : main.o kbd.o command.o display.o \
insert.o search.o files.o utils.o
	cc -o edit main.o kbd.o command.o display.o \
insert.o search.o files.o utils.o
main.o : main.c defs.h
	cc -c main.c
kbd.o : kbd.c defs.h command.h
	cc -c kbd.c
command.o : command.c defs.h command.h
	cc -c command.c
display.o : display.c defs.h buffer.h
	cc -c display.c
insert.o : insert.c defs.h buffer.h
	cc -c insert.c
search.o : search.c defs.h buffer.h
	cc -c search.c
files.o : files.c defs.h buffer.h command.h
	cc -c files.c
utils.o : utils.c defs.h
	cc -c utils.c
clean :
rm edit main.o kbd.o command.o display.o \
insert.o search.o files.o utils.o
———v1——
“edit” is the final executable file. It rely on Intermediate object files which are
 main.o kbd.o command.o display.o insert.o search.o files.o utils.o.

Inorder to make this makefile maintainable. We could define a variable

objects = main.o kbd.o command.o display.o\
insert.o search.o files.o utils.o #We could this objects to replace these “.o” file.

———v2——
objects = main.o kbd.o command.o display.o \
insert.o search.o files.o utils.o
edit : $(objects)
	cc -o edit $(objects)
main.o : main.c defs.h
	cc -c main.c
kbd.o : kbd.c defs.h command.h
	cc -c kbd.c
command.o : command.c defs.h command.h
	cc -c command.c
display.o : display.c defs.h buffer.h
	cc -c display.c
insert.o : insert.c defs.h buffer.h
	cc -c insert.c
search.o : search.c defs.h buffer.h
	cc -c search.c
files.o : files.c defs.h buffer.h command.h
	cc -c files.c
utils.o : utils.c defs.h
	cc -c utils.c
clean :
rm edit $(objects)
—-—v2——

——v3—-
It is OK to reduce the number of repeatedly used .h or .o file. There is another version to put these repeated file into one place. But it makes the makefile unclear.
Currently, do not do that.

——v3—