Re: optional ipv6 support

["Rick \"Zero_Chaos\" Farina" <zerochaos () gentoo org>]

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On 01/30/2013 01:06 AM, David Fifield wrote:
> On Tue, Jan 29, 2013 at 10:24:12PM -0500, Rick "Zero_Chaos" Farina wrote:
> > Currently the only ipv6 related things happening in configure.ac is this:
> >
> > dnl Check IPv6 raw sending flavor.
> > CHECK_IPV6_IPPROTO_RAW
> >
> > This means that when configure runs it checks libpcap for ipv6 support
> > and enables if it finds support.
> >
> > For many reasons, this is not a great thing.  So call "automagic
> > dependencies" [1] cause a great deal of heartache when things are
> > rebuilt or binaries are transfered to other systems.  Would it be
> > possible to add --enable-ipv6 --disable-ipv6 flags like in nbase?
> >
> > # Check for IPv6 support -- modified from Apache 2.0.40:
> >
> > AC_ARG_ENABLE(ipv6,
> >   [  --disable-ipv6          Disable IPv6 support ],
> >   [ if test "$enableval" = "no"; then
> >         user_disabled_ipv6=1
> >     fi ],
> >   [ user_disabled_ipv6=0 ] )
> >
> > Thanks for your consideration,
>
> Nmap gets its value for HAVE_IPV6 from nbase, so it should already work
> as you wish. It's possible that there is code referring to IPv6 that is
> not protected by HAVE_IPV6 guards, but that would be a separate bug.
>
> I just tried configuring Nmap with
>       ./configure --disable-ipv6
> and HAVE_IPV6 is disabled in nbase_config.h, as expected.

You are most correct.  Reading the files was not as clear as to how they
interact, actually testing works great. Thanks for your sanity :-)

- -Zero

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