Re: Collation tests in fns-tests.el

[Ken Brown]

On 10/30/2015 5:35 PM, Eli Zaretskii wrote:
> > Cc: address@hidden, address@hidden
> > From: Ken Brown <address@hidden>
> > Date: Fri, 30 Oct 2015 17:10:48 -0400
> >
> > On 10/30/2015 4:28 PM, Eli Zaretskii wrote:
> > > You already said in that discussion what I'd suggest ;-)
> > >
> > > Since Cygwin tries to be compatible to GNU/Linux (i.e. glibc), it
> > > should indeed use some non-zero flags in its implementation of string
> > > collation-dependent comparison.  IMO, it makes no sense not to do
> > > that, since users expect that to happen.
> >
> > Yes, I agree completely.  The issue is implementation.  Simply using the
> > NORM_IGNORESYMBOLS flag yields comparison functions that can return 0 on
> > unequal strings.  Eric pointed out the problem with that; moreover, it
> > seriously violates users' expectations and compatibility with glibc.  I
> > thought I had a way around that, but Corinna pointed out in
> > https://www.cygwin.com/ml/cygwin/2015-10/msg00559.html why my suggestion
> > doesn't work.  At this point I'm out of ideas.
>
> I don't see why that conclusion is the only reasonable one (the
> "seriously violates users' expectation" part surprises me), but I
> don't really consider myself an expert on this, certainly not in
> Cygwin.
>
> If Cygwin's implementation of strcoll cannot be fixed, then we should
> treat this test on Cygwin as expected failure.

I'll probably do that, but I'll wait to see if Michael has anything to add.

Ken