From owner-freebsd-current  Wed May 10 10: 8:23 2000
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Date: Thu, 11 May 2000 03:08:02 +1000 (EST)
From: Bruce Evans <bde@zeta.org.au>
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To: Doug Rabson <dfr@nlsystems.com>
Cc: Mike Smith <msmith@FreeBSD.ORG>, obrien@FreeBSD.ORG,
	freebsd-current@FreeBSD.ORG
Subject: Re: One more question (different now) 
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On Wed, 10 May 2000, Doug Rabson wrote:

> You can suppress the warning if you cast to uintptr_t first. Pretty ugly
> though.

For (almost) full uglyness and correctness, you have to cast to
"volatile void *" first, then back via "void *":

#define	unvolstructfoop(sfp) \
    ((struct foo *)(void *)(uintptr_t)(volatile void *)(sfp))

For full uglyness, add an ifdef to test if uintptr_t exists (see the C99
standard), and backup methods for when it doesn't exist.

Bruce



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