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Broken autoconf mmap test


From: Ken Brown
Subject: Broken autoconf mmap test
Date: Tue, 22 Mar 2011 16:53:03 -0400
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.15) Gecko/20110303 Thunderbird/3.1.9

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:

  http://lists.gnu.org/archive/html/bug-autoconf/2009-11/msg00015.html

It was reported in

  http://lists.gnu.org/archive/html/autoconf-patches/2009-11/msg00017.html

that the patch didn't help on HP/UX 11, which is another platform where the test was failing. I can't find any follow-up to this in the archives of the autoconf mailing lists.

Is there any chance of getting this bug fixed? 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

in the build script. But it would be better to get a solution in autoconf itself.

Ken



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