netdev - Re: depending on IPv6 symbols

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Date:	Tue, 06 Feb 2007 14:49:39 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	rdreier@...co.com
Cc:	kazunori@...azawa.org, miika@....fi, Diego.Beltrami@...t.fi,
	herbert@...dor.apana.org.au, netdev@...r.kernel.org,
	usagi-core@...ux-ipv6.org, mst@...lanox.co.il
Subject: Re: depending on IPv6 symbols

From: Roland Dreier <rdreier@...co.com>
Date: Tue, 06 Feb 2007 14:43:15 -0800

> So I hope we can come up with a short-range plan to deal with the
> possibility of built-in code calling icmpv6_send() at least...  As you
> said, should we just convert IPV6 to a bool instead of a tristate?

Netfilter handles this by using the Kconfig dependency construct:

config FOO
	depends on (IPV6 || IPV6=n)

which essentially means:

if IPV6 is disabled:

	Allow FOO to build modular or static, but will get no ipv6
	support.

if IPV6 is "y"

	Allow FOO to be a static or modular build

if IPV6 is "m"

	Allow FOO to be a modular build only

This is the only way to make it all work out currently.
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