Help wanted: Linking to libbind9 on Ubuntu Linux

[Rick Dicaire]

For libbind9, https://packages.ubuntu.com/trusty/libbind9-90

On Tue, Mar 20, 2018 at 4:02 PM, Ronald F. Guilmette <rfg at tristatelogic.com>
wrote:

>
> In message <20180320193041.d2bwvgkgyvqemyff at mycre.ws>,
> Robert Edmonds <edmonds at mycre.ws> wrote:
>
> >> I am porting some code of mine from FreeBSD to this Ubuntu system
> >> and I'm getting the following unresolved symbols at link time:
> >>
> >>     __res_query
> >>     __res_mkquery
> >>     __res_send
> >>
> >> It seems apparent that this is caused by the fact that FreeBSD has
> >> the resolver routines integrated into libc, whereas Linux systems
> >> don't.
> >
> >For glibc versions that are less than about ten years old, these should
> >be available in libresolv, which is part of glibc.
>
> Thanks Robert!  I added -lresolv to the link and now the link step is
> succeding.
>
> >See the resolver(3) manpage, which is probably in the manpages-dev
> >package on Ubuntu 14.
>
> For the record, I *did* look over that man page, and several others,
> before I posted my question.  But neither that man page nor any of the
> several others I looked at ever said a word about the necessary extra
> -l option needed in order to drag in the needed resolver routines.
>
> >This is unrelated to libbind9, which is a different API.
>
> Well, see, and -that- may perhaps be a problem.  I dunno yet.  My hope,
> of course, is that I have not relied on any of the finer subtleties or
> more obscure aspects of libbind in any of my coding, but it may come to
> light that I have, and I may in fact end up needing to link to the
> real libbind9.  I would still like to know how to do that, just in case,
> and I am still utterly perplexed and mystified about why the linker
> couldn't seem to find libbind9, even when I gave it the explicit path
> to the thing via an appropriate -L option.
>
> I hope somebody will explain to that to me still, because whatever the
> answer is to that mystery, it is sure to be highly educational, for me
> anyway.
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