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Re: Broken autoconf mmap test

From: Eric Blake
Subject: Re: Broken autoconf mmap test
Date: Tue, 22 Mar 2011 14:57:43 -0600
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On 03/22/2011 02:53 PM, Ken Brown wrote:
> For a long time, the autoconf mmap test has failed on Cygwin even though
> Cygwin has a working mmap.  This was reported to bug-autoconf in
> November 2009, and a patch that fixed it for Cygwin was submitted by
> Eric Blake:

And that patch was applied in autoconf 2.65.  Per the NEWS:
* Major changes in Autoconf 2.65 (2009-11-21) [stable]
** The AC_FUNC_MMAP macro has been fixed to be portable to systems like
   Cygwin (bug present since macro was introduced in 2.0).

> Is there any chance of getting this bug fixed?

At this point, the only places where the bug still exists in the wild
are packages that use autoconf < 2.65 to generate their configure file.

>  Currently, the cygport
> tool (which many Cygwin package maintainers use to build packages) works
> around it by exporting
>   ac_cv_func_mmap_fixed_mapped=yes

And this is the correct way to work around such packages if you want to
avoid rerunning autoconf with a newer version.

Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library

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