Subject: Re: makeing a loadable module
From: Eric Gaumer <gaumerel@ecs.fullerton.edu>
To: gene.heskett@verizon.net
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <200411072328.48785.gene.heskett@verizon.net>
References: <200411072328.48785.gene.heskett@verizon.net>
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Date: Sun, 07 Nov 2004 22:08:55 -0800
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On Sun, 2004-11-07 at 23:28 -0500, Gene Heskett wrote:
> Greetings;
>=20
> I found some code I can play with/hack/etc, in the form of a loadable=20
> module and some testing driver programs, in 'dpci8255.tar.gz'.
>=20
> Unforch its for a slightly different card than the one I have, and=20
> once I've hacked the code to suit, I need to rebuild it.
>=20
> So whats the gcc command line to make just a bare, loadable module for=20
> say a 2.4.25 kernel?   Obviously I'm missing something when it=20
> complains and quits, claiming there is no 'main' defined, which I=20
> don't think modules actually have one of those?
>=20
> What I'm trying to do (hey, no big dummy jokes please :)
>=20
> [root@coyote dist]# cc -o dpci8255.o dpci8255lib.c
> /usr/lib/gcc-lib/i386-redhat-linux/3.3.3/../../../crt1.o(.text+0x18):=20
> In function `_start':
> : undefined reference to `main'
> collect2: ld returned 1 exit status
>=20
> The gcc manpage isn't that helpfull and I've now read thru it twice.

This should work for a single source file=20

]$ gcc -O2 -D__KERNEL__ -DMODULE -DHAVE_CONFIG_H -I/usr/src/linux/include -=
c dcpi8255.c

If your using SMP then you'll need to define that as well.

--=20
Eric Gaumer <gaumerel@ecs.fullerton.edu>

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