From: Roland Dreier <redacted>
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.