I've overhauled the optimisation tests. This improves the optimisation tests and makes them a little more lenient to allow for machine precision and round-off error artifacts on different architectures, operating systems, etc. This has been applied to the 1.2 line and also ported to the 1.3 line. Many of the changes suggested in this thread have been incorporated. The full details of the changes can be seen in the commit message located at https://mail.gna.org/public/relax-commits/2006-10/msg00106.html (Message-id: <E1Gd1Cx-0007rj-4Z@xxxxxxxxxxxxxxxxxx>).
If the test suite still fails on certain architectures, please report the results and the tests will then be loosened.
Edward