[Bugs] [Bug 1553926] New: configure --without-ipv6-default has odd behaviour

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1553926

            Bug ID: 1553926
           Summary: configure --without-ipv6-default has odd behaviour
           Product: GlusterFS
           Version: mainline
         Component: build
          Assignee: bugs at gluster.org
          Reporter: chewi at aura-online.co.uk
                CC: bugs at gluster.org



Description of problem:
configure.ac currently has these lines for the ipv6-default switch.

> AC_ARG_WITH([ipv6-default],
>     AC_HELP_STRING([--with-ipv6-default], [Set IPv6 as default.]),
>     [with_ipv6_default=$with_libtirpc], [with_ipv6_default=no])

This disables ipv6-default when no switch is given at all but otherwise checks
if libtirpc was requested, regardless of whether you have given
--with-ipv6-default or --without-ipv6-default.

You could also specify --without-libtirpc --with-ipv6-default and it would
silently disable both, although this combination is not possible in any case.

Version-Release number of selected component (if applicable):
4.0.0, master (940f870f).

How reproducible:
Always.

Steps to Reproduce:
./configure --without-ipv6-default

Actual results:
IPV6 default         : yes
Use TIRPC            : yes

Expected results:
IPV6 default         : no
Use TIRPC            : yes

Additional info:
This is important because ipv6-default breaks Gluster for systems that have
IPv6 disabled.

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