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Date: Mon, 8 Apr 2002 09:29:24 +0200
From: Corinna Vinschen <cygwin AT cygwin DOT com>
To: "'cygwin'" <cygwin AT cygwin DOT com>
Subject: Re: Autoconf 2.53 check for working mmap fails
Message-ID: <20020408092924.A24639@cygbert.vinschen.de>
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References: <000001c1dcc0$9cd0b680$0200a8c0 AT sknet01>
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On Fri, Apr 05, 2002 at 05:40:36PM +0100, (1pH3r_IVI4IV14( wrote:
> When configuring a package using autoconf-2.53, the built-in check for
> mmap (AC_FUNC_MMAP I believe) fails:
> 
> [...]
> checking for working mmap... no
> [...]

That's expected unfortunately.  The mmap test in autoconf (I know
this failing test since at least version 2.13) checks the memory
mapping using a UNIXism.  It tries to mmap() a file to an already
area already allocated using malloc().  This is plainly impossible
on Win32 where the memory used for mmap must be unallocated
and which has to reside in a special memory arae used for mappings.
Therefore the autoconf mmap test must fail on Win32.

Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin AT cygwin DOT com
Red Hat, Inc.

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