I have created patch to prefix those calls. More in bind-workers list at
https://lists.isc.org/pipermail/bind-workers/2017-February/003402.html

On Tue Jan 03 19:31:39 2017, pemensik@redhat.com wrote:
> Hello ISC,
> 
> we have trouble with exported getaddrinfo function (also getnameinfo,
> freeaddrinfo, gai_strerror) from libirs. It is unclear to me why it
> does export symbols without irs_ prefix and without its own header
> file. I found some testing in configure script regarding salen
> attribute. But it does not even test supported flags of system call.
> 
> What is reason to reimplement library call provided usually by libc
> library? I think there might be some testing in configure script
> whether getaddrinfo implementation is sufficient. If not, it might add
> its own symbols. But I would prefer something like lwresd_getaddrinfo:
> irs_getaddrinfo, maybe with possibility to define getaddrinfo define
> from header. I miss at least manual configure option to disable it. I
> suspect there is some reason for it. Is there functionality missing
> from system libraries? Would it make sense to export irs_ prefixed
> variants where own implementation is needed and use system functions in
> the other case?
> 
> I have found libirs is usually used only by delv from bind package,
> maybe to provide also verification. It is used also by DHCP server
> however. But it prevents linking together with openldap library, which
> is using flags that bind implementation does not support.
> 
> See https://bugzilla.redhat.com/show_bug.cgi?id=1205168
> 
> What is a reason to export system calls?
> 
> Best Regards,
> 
> --
> Petr Menšík
> Software Engineer
> Red Hat, http://www.redhat.com/
> email: pemensik@redhat.com  PGP: 65C6C973