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[Octave-bug-tracker] [bug #42176] Octave built without OpenMP crashes wh

From: Rik
Subject: [Octave-bug-tracker] [bug #42176] Octave built without OpenMP crashes when unloading OpenMP-enabled oct-files
Date: Sun, 22 Feb 2015 14:48:49 +0000
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0

Follow-up Comment #5, bug #42176 (project octave):

One wrinkle is that the ax_openmp.m4 file requires Autoconf > 2.69.  I can no
longer build on Ubuntu 12.04 LTS (admittedly 3 years old this April).  It
seems like users on really long term stable platforms like Red Hat Enterprise
Linux will have the same issue.

Maybe we should still enable OpenMP but continue to use our own compile test?

Alternatively, there's hacking the ax_openmp.m4 file.  They have an
AC_PREREQ([2.69]) because they are using the _AC_LANG_PREFIX macro.  Perhaps
there is a way to simulate that macro through a longer sequence of commands in
earlier versions.

If we do just decide to go with it then we should raise the required minimum
version of Autoconf in Octave's own configure.ac file and make a note that the
version required for building has changed. 


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