Re: autoconf check for AF_UNIX sockets

On Sun, 20 Aug 2000, Peter Eisentraut wrote:

> I wrote:
>
> > > can our autoconf guru create a test for checking the availability of AF_UNIX
> > > sockets? It could be defined in config.h as HAVE_UNIX_SOCKET or similar. It
> > > will enable to use them in the newest cygwin where are this sockets
> > > implemented.
> >
> > I'll check into it.
>
> A classical Autoconf test is impractical. First of all there's no reliable
> compile-time evidence regarding these Unix sockets so we'd have to run a
> program from configure. That's already a semi-no-no because it will break
> cross-compilation and it also sounds a bit like a security concern.
> Moreover, it's still doubtful whether you could learn a lot this way,
> perhaps the user that runs configure cannot create these sockets or not
> where configure is trying to create it, etc.

can't you just do a link test that checks that AF_UNIX is defined?