Recently (https://bitbucket.org/eigen/eigen/commits/85794b09e) a number of EIGEN_DEPRECATED annotations were added which causes lots of warnings in the test-suite (which hides more valid warnings).
* Not test deprecated functions?
* Disable deprecation warnings when testing deprecated functions?
* Do not deprecate functions when building the test-suite?
I would probably go with "Disable deprecation warnings when testing deprecated functions?" + putting tests of deprecated features into separate unit tests so that deprecation warnings are disabled only for them. Otherwise there is a risk to miss warnings about non-deprecated code calling deprecated functions.
There already was a compile-flag for that: EIGEN_NO_DEPRECATED_WARNING
I'm not 100% sure why Geometry/Transform.h used lazyAssign instead of simple assignments (I guess the only time this really makes a difference would be for dynamic-sized transformations).
Maybe a the assignments should be marked as not aliasing, though (feel free to modify that).
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