The documentation page http://eigen.tuxfamily.org/dox/TopicPreprocessorDirectives.html should document the two macros EIGEN_MAX_STATIC_ALIGN_BYTES, EIGEN_MAX_ALIGN_BYTES. I hear these let the user set an upper limit for the alignment of certain data (fixed-size matrix objects and heap-allocated dynamic sized matrixes).
Good catch, https://bitbucket.org/eigen/eigen/commits/243d240007fc/ Summary: Bug 1348: Document EIGEN_MAX_ALIGN_BYTES and EIGEN_MAX_STATIC_ALIGN_BYTES, and reflect in the doc that EIGEN_DONT_ALIGN* are deprecated.
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