Re: Makefile Help

["Kayvan A. Sylvan" <kayvan at sylvan dot com>]

On Fri, Mar 15, 2002 at 10:17:28AM -0500, Rich wrote:
> I'm new to gcc and am running Mandrake Linux 8.1 with gcc 2.96-0.62mdk.
> 
> I've been experimenting with writing my own makefiles and have run into
> a problem.  The makefiles work OK as long as all of the source code is
> in the same subdirectory, however, if the source is in another
> subdirectory, the makefile can't find it.  Here's a simple code sample:
> 
> -------------------------------------------------
> CC = gcc
> 
> all: simple
> 
> vpath %.h ~/Projects/test/src
> 
> simple.o: simple.c 
> 	$(CC) -c simple.c
> 
> simple: simple.o
> 	$(CC) -o simple simple.o
> -------------------------------------------------------
> 
> The source code is in the /Projects/test subdirectory but simple.c has a
> header file called foo.h that's in the /Projects/test/src subdirectory. 
> The error message is "No such file or directory called foo.h".  Why
> isn't it being found?  VPATH= ~/Projects/test/src doesn't work either.
> 
> What's missing?

You don't use vpath for the c compiler/pre-processor.

Instead, use the -I flag:

CC = gcc
CFLAGS = -I /some/other/directory

%.o: %.c
	$(CC) $(CFLAGS) -c $<

all: simple

simple: simple.o
	$(CC) -o simple simple.o 

-- 
Kayvan A. Sylvan          | Proud husband of       | Father to my kids:
Sylvan Associates, Inc.   | Laura Isabella Sylvan  | Katherine Yelena (8/8/89)
http://sylvan.com/~kayvan | "crown of her husband" | Robin Gregory (2/28/92)

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