libufs limitation trying to make newfs work on plain files

[Luigi Rizzo]

On Sun, Nov 30, 2008 at 12:58:59PM +0200, Kostik Belousov wrote:
> On Sun, Nov 30, 2008 at 05:31:10AM +0100, Luigi Rizzo wrote:
> > libufs limitation trying to make newfs work on plain files
...
> You proposal would introduce incompatibility in the ABI exposed by
> one of the system library. The solution adopted by Linux and (recently)
> by FreeBSD, is to use ELF symbol versioning. It seems that this case
> can be handled by symver. As additional benefit, after your work
> we would got one more symver-ed system library.

could you point me to an example in freebsd that shows how to
use this feature ?

thanks
luigi