[libvirt] [PATCH] nss: use more strict check for automatic enabling

[Roman Bogorodskiy]

  Roman Bogorodskiy wrote:

>   Michal Privoznik wrote:
> 
> > On 21.03.2016 06:21, Roman Bogorodskiy wrote:
> > While this would fix the build, it would disable the whole feature on
> > freebsd. The problem is with the structure that is needed just for
> > _nss_libvirt_gethostbyname4_r(). Should we change the code in that way
> > that the function is built conditionally when the structure is present?
> > That way we still could have _gethostbyname3_r() on systems providing
> > the header file but not having the structure.
> 
> To tell the truth, I didn't look close at the nss implementation and
> wasn't sure if interfaces are compatible on Linux and FreeBSD for such
> type of things.
> 
> I'll take a look if I can use this plugin on FreeBSD if I just disable
> _nss_libvirt_gethostbyname4_r() related stuff. 

Quick follow up on this:

I tried the patch you posted on IRC
(http://fpaste.org/343763/58660075/). As ALIGN is defined by system
headers on FreeBSD, I just renamed it to LIBVIRT_ALIGN and got it
compiled.

However, trying to use it spawned an error like this:

NSSWITCH(nss_load_module): libvirt, Undefined symbol "nss_module_register"

Apparently, FreeBSD's nss layout requires some additional steps:
defining an array of the methods provided and registering it with
nss_module_register (at least that's what I understood after playing
with that briefly). I hope I can bring this together before the next
release.

Roman Bogorodskiy