Hi,

I am on Clang/OS X Yosemite and my project was using Eigen fine. Then I introduced an external library that also uses Eigen and I now have this compilation error:

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/usr/local/include/Eigen3/Eigen/src/Geometry/Quaternion.h:516:13: Implicit instantiation of undefined template 'Eigen::internal::quaternionbase_assign_impl<Eigen::Matrix<double, 3, 1, 0, 3, 1>, 3, 1>'

This is seems to come from a declaration in the library:

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#include <Eigen/Eigen>

And this is the code where I use the Quaternion:

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Eigen::Quaternion<double> q, q_wv, q_ic, q_cv;
q_cv = _poseHandler->GetAttitudeMeasurement();  // problem here

First of all, since that include takes into account Core and Geometry, I do not think it's a header missing. Then I do not understand the "undefined template" error, because the internal template is declared in the same header if you go look into it. So I am left with a question: what is wrong?

please, include respective links when cross-posting: http://stackoverflow.com/questions/2709 ... y-or-clang