[eigen] cwiseop_1 test failure

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I had a quick look at the cwiseop_1 test, which according to the dash board fails on both Gael's and my computer but only with GCC 4.3.

I did not get very far and I have other commitments at the moment (and I've also run out of ideas), but perhaps somebody can continue from here.

The offending line is

   VERIFY_IS_APPROX(m4.setConstant(s1), m3);

Here, m3 and m4 are of type MatrixType = Matrix<1,1,float>, s1 is a random float, and m3 is set to MatrixType::Constant(1,1,s1).

I did not manage to get an self-contained test case, though given more time this should be possible.

valgrind reports:
Use of uninitialised value of size 4
    at 0x804A35F: bool Eigen::test_ei_isApprox<Eigen::Matrix<float, 1, 1, 0, 1, 1>, Eigen::Matrix<float, 1, 1, 0, 1, 1> >(Eigen::Matrix<float, 1, 1, 0, 1, 1> const&, Eigen::Matrix<float, 1, 1, 0, 1, 1> const&) (in .../cwiseop_1)
    by 0x804AE1E: void cwiseops<Eigen::Matrix<float, 1, 1, 0, 1, 1> >(Eigen::Matrix<float, 1, 1, 0, 1, 1> const&) (in .../cwiseop_1)
    by 0x8049DB9: test_cwiseop() (in .../cwiseop_1)
    by 0x804A0EA: main (in .../cwiseop_1)

The error persists if I replace

   VERIFY_IS_APPROX(m4.setConstant(s1), m3);


   VERIFY(test_ei_isApprox(m4.setConstant(s1), m3));

However, the error goes away if I replace it by

   VERIFY(m4.setConstant(s1).isApprox(m3, test_precision<typename MatrixType::Scalar>()));

As far as I see, this is just inlining the definition of test_ei_isApprox, so I don't see why this makes a difference.


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