[eigen] Possible Bug ?

[Andreas Barth <andreas-barth@xxxxxx>]

See this:

http://stackoverflow.com/questions/24730981/undefined-reference-error-from-gcc-using-a-template-with-a-stdvector-and-an-ei

The problem is an 'undefined reference' linker error when defining a 
template function specialization including a
std::vector<Eigen::Matrix>> as parameter.
The described behavior has been reproduced by different users and with 
different versions of GCC using eigen_3.2.1