Autoconf 2.53 check for working mmap fails

Corinna Vinschen
Mon Apr 8 00:29:00 GMT 2002

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 Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                      
Red Hat, Inc.

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