Hi,
Thanks for putting this together. I am curious about the results, as a user of Eigen.
I tested without a Google account, and I can view it.
I'm using Eigen with several compilers using half-implemented versions of C++ standards. I think you should specify if you want the previous or next version in those situations, to get consistent answers. For example, should GCC 6.3.0's "-std=gnu++1y" be c++11 or c++14?
https://gcc.gnu.org/onlinedocs/gcc-6.3.0/gcc/Standards.html#Standards has docs for what those mean, for reference.
When you ask about architecture features you're "using" Eigen with, do you want what features the hardware supports or which ones are enabled at compile time?