getaddrinfo() AI_IDN feature test

[Mike Frysinger]

On 09 Mar 2015 09:58, Martin Lambers wrote:
> On Sun, 8 Mar 2015 09:29:14 -0400, Mike Frysinger wrote:
> > On 01 Jan 2015 08:03, Martin Lambers wrote:
> > > I recently changed two programs to use the AI_IDN flag for
> > > getaddrinfo() instead of using libidn.
> > > 
> > > Users reported runtime failure (EAI_BADFLAGS) on systems where glibc
> > > was build without libidn support.
> > > 
> > > On these systems, AI_IDN was defined nevertheless -- is this
> > > intended behaviour? If so, then #ifdef AI_IDN is not enough; what
> > > is the recommended way to check if AI_IDN actually works?
> > 
> > what version of glibc exactly ?  my reading of the git history is
> > that since AI_IDN was added to the header for 2.4, glibc has
> > unconditionally supported it. -mike
> 
> The glibc as shipped with AstLinux <http://www.astlinux.org>. I do not
> have more information. Yes, AI_IDN is added unconditionally, but it
> is only actually accepted when glibc is compiled with libidn. See
> glibc-2.21/sysdeps/posix/getaddrinfo.c lines 2344-2347.

yes, but if you trace back the code, you'll see that:
(1) libidn is always bundled with glibc
(2) the libidn configure scripts always define HAVE_LIBIDN
-mike
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