Variables

• Variables

allow a text string to be defined once and substituted in multiple places later.
objects = main.o kbd.o command.o display.o \
insert.o search.o files.o utils.o
Then, we can substitute the variable's value by writing $(objects).

Here is how the complete simple makefile looks when you use a variable for the object files.

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)