bug#15094: Fix for posix_memalign on Cygwin

[Ken Brown]

On 8/14/2013 10:46 PM, Eli Zaretskii wrote:
> > Date: Wed, 14 Aug 2013 15:52:53 -0400
> > From: Ken Brown <kbrown@cornell.edu>
> > CC: 15094@debbugs.gnu.org
> >
> > /* Cygwin allows applications to provide their own malloc.  As of
> > cygwin-1.7.24, applications that provide their own malloc are also
> > allowed to provide their own posix_memalign (but not memalign).  Calls
> > to memalign are handled by Cygwin's memalign, which always returns
> > ENOSYS if the application has defined its own malloc.  So we have to
> > rename memalign in order to make sure that posix_memalign calls
> > Emacs's memalign rather than Cygwin's.  */
>
> How does Cygwin memalign come into play, when Emacs provides its own?

As I said in the comment, Cygwin does not let applications define their 
own memalign.  During linking, calls to memalign become calls to 
Cygwin's memalign.

Ken