AXISHK
asked on
Linux Makefile
Suppose the following files are in the current directory, (hellomake.c, hellofunc.c and hellomake.h)
Inside the makefile :
CC=gcc
CFLAGS=-I.
DEPS = hellomake.h
%.o: %.c $(DEPS)
$(CC) -c -o $@ $< $(CFLAGS)
hellomake: hellomake.o hellofunc.o
gcc -o hellomake hellomake.o hellofunc.o -I.
What will be replaced in the line "$(CC) -c -o $@ $< $(CFLAGS)" ?
Thanks
Inside the makefile :
CC=gcc
CFLAGS=-I.
DEPS = hellomake.h
%.o: %.c $(DEPS)
$(CC) -c -o $@ $< $(CFLAGS)
hellomake: hellomake.o hellofunc.o
gcc -o hellomake hellomake.o hellofunc.o -I.
What will be replaced in the line "$(CC) -c -o $@ $< $(CFLAGS)" ?
Thanks
gheist
Is it a exam question?
What do you mean with "replaced"? As in files, or what the variables mean?
Like $(CC)= gcc for example?
Like $(CC)= gcc for example?
Is it a exam question?
Would think so wouldn't you :)
Just that what is written reflects what gnu make already knows - make .o from .c file
ASKER
No, this is just seen in an article about makefile..
$(CC) -c -o $@ $< $(CFLAGS)
will be translated as
gcc -c -o hellomake.o -I
gcc -c -o hellofunc.o -I
ie, gcc will find xxx.c and complie it to the corresponding object file, xxx.o ... correct ?
$(CC) -c -o $@ $< $(CFLAGS)
will be translated as
gcc -c -o hellomake.o -I
gcc -c -o hellofunc.o -I
ie, gcc will find xxx.c and complie it to the corresponding object file, xxx.o ... correct ?
gmake knows that line without makefile
if you say
make x.o
it will run gcc x.c -o x.o
see http://c.learncodethehardway.org/book
if you say
make x.o
it will run gcc x.c -o x.o
see http://c.learncodethehardway.org/book
ASKER
Tks, but I want to clarify what does the line do in makefile,
$(CC) -c -o $@ $< $(CFLAGS)
Tks again.
$(CC) -c -o $@ $< $(CFLAGS)
Tks again.
Read first 3 pages of book I sent to you in a link... It answers your question.
ASKER
Thanks, but i still can't sure whether my understanding is correct or not..
Will the command line
$(CC) -c -o $@ $< $(CFLAGS)
be translated as
gcc -c -o hellomake.o -I
gcc -c -o hellofunc.o -I
and gcc will automatically look for the source code hellomake.c and hellofunc.c respectively ? Tks
Will the command line
$(CC) -c -o $@ $< $(CFLAGS)
be translated as
gcc -c -o hellomake.o -I
gcc -c -o hellofunc.o -I
and gcc will automatically look for the source code hellomake.c and hellofunc.c respectively ? Tks
ASKER CERTIFIED SOLUTION
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