bug#19909: [PATCH] Error out if with-file-notification=w32 is specified on cygwin

[Ken Brown]

On 2/20/2015 10:10 AM, Eli Zaretskii wrote:
> > From: Robert Pluim <rpluim@gmail.com>
> > Date: Fri, 20 Feb 2015 15:16:49 +0100
> >
> > > According to the comment in w32notify.c, w32.h is included only for
> > > w32_strerror.  Could you try commenting out the w32.h inclusion, and
> > > instead copy the w32_strerror prototype into w32notify.c?  Does Emacs
> > > compile then as part of the Cygwin-w32 build, and do file
> > > notifications work?  (I don't have Cygwin installed to try that,
> > > sorry.)
> >
> > No, that doesn't compile. w32notify.c needs (at least)
> > w32_unicode_filenames, filename_to_utf16(), filename_to_ansi() and
> > w32_valid_pointer_p() from w32.c.
>
> Right.  But those problems are quite simple to solve.
>
> Ken, would you like to try to solve them?  I could suggest a patch,
> but it would be 100% untested.

I'm busy with other things at the moment and can't get to it right away. 
 If it's easy for you to suggest a patch, why don't you go ahead, and 
Robert can test it.  Or you can wait a couple weeks until I can look at it.

BTW, file-notification=gfile works fine in the Cygwin-w32 build, so I'm 
not sure there's any need to put a lot of effort into this.

Ken