ec2fd0f7ed99c65d45164bbaa54cfa4aedcfcacc
EIGEN_HAS_CXX14 and some other feature test macros
Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
For more information go to http://eigen.tuxfamily.org/.
For pull request, bug reports, and feature requests, go to https://gitlab.com/libeigen/eigen.