Broken autoconf mmap test

[Ken Brown]

On 3/25/2011 5:34 AM, Corinna Vinschen wrote:
> If you guys think that cheating for autoconf on 64 bit systems is a good
> idea, I'm willing to implement it.

It seems to me that the best long-term solution is for the autoconf test 
to be split into two tests as Eric suggested.  That way programs that 
really need full POSIX compliance (if there are any such programs) can 
test for it.

Until that happens and becomes widely known, however, I think cheating 
is better than the status quo.  As it stands, Cygwin packages that are 
built with cygport will cheat anyway, and other packages will have 
different behavior depending on whether or not the build was done on a 
64-bit machine.  Maintainers who upgrade from a 32-bit machine to a 
64-bit machine might not even notice that their packages have stopped 
using mmap.

Ken