Re: mmap test failing on cygwin

[Noah Misch]

On Sun, Mar 20, 2005 at 10:59:13PM +0100, a.rburgers wrote:
> the autoconf test for mmap is failing for cygwin,
> although there is a functional mmap available
> on that platform..
> 
> This message gives a patch:
> 
> http://lists.gnu.org/archive/html/autoconf-patches/2000-10/msg00241.html

Summary: AC_FUNC_MMAP rejects the Cygwin mmap because MAP_FIXED on a malloc'ed
region fails; rejecting it is bad because many programs that use mmap do not
need that to work.  Nonetheless, changing AC_FUNC_MMAP to help that majority,
perhaps marginally, breaks programs relying on the check as it stands.

Reader survey: Do you know of a program other than GNU grep that depends on
AC_FUNC_MMAP to reject the mmap of some system as unsuitable?  Put another way,
do you know of a program that would stop working on at least one system were you
to replace `AC_FUNC_MMAP' with `AC_CHECK_FUNC([mmap])'?