[ECOS] Re: about makefile

[=?gb2312?B?1cUgwcE=?= <johnsonest at hotmail dot com>]

Dear nickg,
 now i have modify my makefile as following:
(1)
HEAD_DIR = include
VPATH = src include

test:  test.o cs.o
	gcc -o test  test.o cs.o
	
cs.o:   cs.c cs.h
	gcc -c  src/cs.c -I$(HEAD_DIR)  
test.o: test.c cs.c cs.h
	gcc -c test.c src/cs.c  -I$(HEAD_DIR)
clean:
	-rm *.o

it work well!
(2)
but :
HEAD_DIR = include
VPATH = src:include

test:  test.o cs.o
	gcc -o test  test.o cs.o
	
cs.o:   cs.c cs.h
	gcc -c  cs.c -I$(HEAD_DIR)  
test.o: test.c cs.c cs.h
	gcc -c test.c cs.c  -I$(HEAD_DIR)
clean:
	-rm *.o

> make
make: *** No rule to make target `cs.c', needed by `cs.o'.  Stop.
	
make  can not find file 'cs.c' yet,unless i replace cs.c with src/cs.c.
it seem that VPATH does not work.
(3)
but:
HEAD_DIR = include
#VPATH = src include

test.exe:  test.o cs.o
	gcc -o test  test.o cs.o
	
cs.o:   cs.c cs.h
	gcc -c  src/cs.c -I$(HEAD_DIR)  
test.o: test.c cs.c cs.h
	gcc -c test.c src/cs.c  -I$(HEAD_DIR)
clean:
	-rm *.o
> make
make: *** No rule to make target `cs.c', needed by `cs.o'.  Stop.
it seem that the lack of VPATH,makefile does not work
(4)

#HEAD_DIR = include
VPATH = src include

test.exe:  test.o cs.o
	gcc -o test  test.o cs.o
	
cs.o:   cs.c cs.h
	gcc -c  src/cs.c 
#-I$(HEAD_DIR)  
test.o: test.c cs.c cs.h
	gcc -c test.c src/cs.c  
#-I$(HEAD_DIR)
clean:
	-rm *.o
> make
make*** cs.h:no such file or directory.stoped

I am confused! help me!


> From: Nick Garnett <nickg@ecoscentric.com>
> To: ÕÅ ÁÁ <johnsonest@hotmail.com>
> CC: ecos-discuss@sources.redhat.com
> Subject: Re: about makefile
> Date: 26 Sep 2002 18:00:28 +0100
>
> ÕÅ ÁÁ <johnsonest@hotmail.com> writes:
>
> > Dear nickg,
> >    i have difficulty in orgnizing my header file and source file with
> > makefile:
> > I create two folder ,named after "include" and "src" in current 
directory:
> > >ls
> > include src test.c
> >
> > in test.c, i want to call codes in "include" and "src" folder:
> >
> > #include <stdio.h>
> > #include "cs.h" //in include folder
> >
> > int main()  {
> > ....
> > ...
> > call fucntions in  file "cs.c" in folder "src"
> > ...
> >  }
> >
> > to compile this
> > my makefile is:
> >
> > HEADER_DIR = include
> > test:  test.o cs.o 	gcc -o test  test.o cs.o
> > test.o: test.c cs.h 	gcc -c test.c  cs.o : cs.c cs.h
> >          gcc -c cs.c -I$(SOURCE_DIR)  clean:
> > 	-rm *.o
> >
> > but:
> > >make
> > make: *** No rule to make target `cs.c', needed by `cs.o'.  Stop.
> > in fact,my cs.c is a set of functions called each other,no entry 
function.
> >
> > i am a newcomer about makefile,could you check my makefile ,tell me
> > where error occur?
> >
>
> This is not really relevant to eCos, and it is not my job to teach you
> how to use make, but I'll give you a few pointers:
>
> Make does not know that you want it to look into the src subdirectory
> for cs.c. You need to tell it, either by referring to src/cs.c
> explicily in the makefile, or by using the VPATH mechanism. Find and
> read the GNU make documentation for details.
>
>
> --
> Nick Garnett - eCos Kernel Architect
> http://www.eCosCentric.com/



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