C++11 has been supported by every main-stream compiler for some years. We could enable C++11 mode testing by default.
Also, we should make it possible to run unit tests in C++14/17/... mode. This could reveal usage of deprecated constructs.
To make that future proof, EIGEN_TEST_CXX11 should be deprecated and replaced by something like EIGEN_TEST_CXX_STANDARD (which can be 03/11/14/17/20/...)
Yes, we should replace EIGEN_TEST_CXX11 by EIGEN_TEST_CXX_STANDARD. On my side I use -DEIGEN_TEST_CUSTOM_CXX_FLAGS="-std=cxx.." as a workaround.
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