No template named Eigen::Vector

[hugtalbot]

Recompiling from scratch on Ubuntu 20.04 (SOFA master, further to #4603) I face the following error :

/data/Softwares/sofa/src/master/Sofa/Component/SolidMechanics/FEM/HyperElastic/tests/Material_test.cpp:57:18: error: no template named 'Vector' in namespace 'Eigen'
    const Eigen::Vector<Real, 3>& eigenvalues = eigensolver.eigenvalues();

I see that #include <Eigen/Core> is commented in HyperelasticMaterial.h so I wondered if this is somehow linked.
Any idea, @alxbilger maybe ?

[alxbilger]

That's weird that the CI succeeds to compile. What happens if you uncomment the include?

[hugtalbot]

It does not help unfortunately.

[hugtalbot]

My guess was a change between old versions of eigen and newer ones (mine is 3.3.7-2)

[alxbilger]

That is a wise guess 😝

[hugtalbot]

Clearly this is an issue of Eigen version. Updating to 3.4.0 solved my problem