From owner-freebsd-questions  Tue Jun  8  9:46:35 1999
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Date:	Tue, 8 Jun 1999 09:46:10 -0700
From: "Dylan A. Loomis" <dylan@aero.org>
To: Zhihui Zhang <zzhang@cs.binghamton.edu>
Cc: freebsd-questions@freebsd.org
Subject: Re: How to include my head file?
Message-ID: <19990608094610.A1219@rush.aero.org>
References: <Pine.GSO.3.96.990608103449.15332A-100000@sol.cs.binghamton.edu>
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On Tue, Jun 08, 1999 at 07:43:40AM -0700, Zhihui Zhang wrote:
>=20
> I modify the kernel a little bit.  I add a file "test.h" under the
> directory /usr/src/sys/ufs/ufs.  But when I declare
>=20
> #include <ufs/ufs/test.h>

The compiler is actually looking in its default search path which is
is actually /usr/include.

>=20
> The compiler says it can not find the file test.h.  But it does not
> complain about an existing head file, like:=20
>=20
> #include <ufs/ufs/dir.h>

If you look in /usr/include/ufs/ufs/ you'll see dir.h resides there as well.

>=20
> I have to declare the following (with complete pathname):
>=20
> #include </usr/src/sys/ufs/ufs/test.h>
>=20
> Why there is a difference between dir.h and test.h?  How to let the
> compiler start searching for head files from /usr/src?

The difference is that dir.h exists in two places, and the one being found
is the one in /usr/include/ufs/ufs so if you put your test.h there it will
be found with the:

#include <ufs/ufs/test.h>

Line otherwise, you need to specify the full path:

#include </usr/src/sys/ufs/ufs/test.h>

as you did above, or tell the compiler that it needs to include the
/usr/src/sys in its search path, done with the -I flag e.g.

gcc -I/usr/src/sys foo.c

Then it will find test.h in /usr/src/sys/ufs/ufs with the line

#include <ufs/ufs/test.h>

>=20
> Thanks for any help.
>=20
> --------------------------------------------------
> Zhihui Zhang.  Please visit http://www.freebsd.org
> --------------------------------------------------
>=20
>=20
>=20
> To Unsubscribe: send mail to majordomo@FreeBSD.org
> with "unsubscribe freebsd-questions" in the body of the message

				Hope that helps -DAL-

--=20
Dylan A. Loomis
Computer Systems Research Department     The Aerospace Corporation
e-mail: dylan@aero.org                   phone: (310) 336-2449

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