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Date:	Tue, 22 Mar 2011 22:40:01 -0400
From:	Ken Brown <kbrown AT cornell DOT edu>
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Subject:	Re: Cygwin fails autoconf mmap test under Win 7 (was: Broken autoconf mmap test)
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On 3/22/2011 5:53 PM, Ken Brown wrote:
> 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

I've just checked that the mmap test succeeds (again when configuring 
emacs-23.3) on an XP SP3 system with the same snapshot installed:

$ uname -a
CYGWIN_NT-5.1 Desktop 1.7.9s(0.236/5/3) 20110318 10:29:21 i686 Cygwin

So maybe this is really a problem with Cygwin's mmap (under Win 7) and 
not an autoconf problem after all.

Ken


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