From owner-freebsd-amd64@FreeBSD.ORG  Fri Mar 25 03:15:03 2005
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From: Sean McNeil <sean@mcneil.com>
To: Vinod Kashyap <vkashyap@amcc.com>
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Date: Thu, 24 Mar 2005 19:15:02 -0800
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cc: Peter Jeremy <PeterJeremy@optushome.com.au>
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Subject: RE: undefined reference to `memset'
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Vinod,

On Thu, 2005-03-24 at 19:01 -0800, Vinod Kashyap wrote:
> Just like the problem is not seen when I build only the module, it's
> not seen if I simply write a foo.c (with the example code) and compile it.
> That's the reason I posted the patch to /sys/dev/twa/twa.c, which would
> cause the problem if applied, and then followed with a kernel build.
> I can send the result of running nm on twa.o tomorrow.

Please take a look at other messages in this thread, like some of the
ones I have posted.  They clearly show your problem in a small example
and how it is happening in the -O2 case as memset is being optimized
away.  -O would appear to do the right thing and adding
-minline-all-stringops (at either optimization level) would produce even
better code.

Cheers,
Sean