bug#15094: Fix for posix_memalign on Cygwin

[Ken Brown <kbrown@cornell.edu>]

On 8/15/2013 7:51 AM, Ken Brown wrote:
> 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.

Hold on...I think I'm missing something obvious.  I have to recheck this.

Ken