Broken autoconf mmap test

[Ken Brown]

On 3/22/2011 4:59 PM, Eric Blake wrote:
> On 03/20/2011 02:51 PM, Ken Brown wrote:
>> What's the status of the broken autoconf mmap test, which always fails
>> on Cygwin even though Cygwin has a working mmap?
>
> Autoconf 2.65 and newer do not have the bug.  But packages still exist
> where configure was generated with<  2.65, so these packages still have
> the bug unless you either rerun newer autoconf, or pre-seed the cache.
>
>> Was this ever resolved?  I see that cygport is still using the workaround
>>
>>    export ac_cv_func_mmap_fixed_mapped=yes
>
> This workaround is still necessary, as long as there are still packages
> that don't run autoreconf and where configure was generated with a
> too-old autoconf.

I'm still seeing failures when building both emacs and texlive, even 
after autoreconf with the current (2.68) version installed.  Attached is 
the relevant portion of config.log from an emacs build.  This is a build 
of the current emacs trunk, after running 'autoreconf -I m4'.  The same 
thing happens if I build emacs-23.3.  If you want to try to reproduce 
it, here's the source:

   wget http://ftp.gnu.org/pub/gnu/emacs/emacs-23.3.tar.gz

In case it's relevant, my system is 64-bit Windows 7, with the most 
recent cygwin snapshot:

$ uname -a
CYGWIN_NT-6.1-WOW64 moufang 1.7.9s(0.236/5/3) 20110318 10:29:21 i686 Cygwin

Ken
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