Build Issue with VS2017 due to change in VS handling of std:aligned_storage

[KAL-AL]

When I attempt to build off the latest commit on the master branch, I get the following error when using a Windows 10 box with VS2017 (v15.9.66) in 64-bit mode.
Error C2338 You've instantiated std::aligned_storage<Len, Align> with an extended alignment (in other words, Align > alignof(max_align_t)). Before VS 2017 15.8, the member type would non-conformingly have an alignment of only alignof(max_align_t). VS 2017 15.8 was fixed to handle this correctly, but the fix inherently changes layout and breaks binary compatibility (only for uses of aligned_storage with extended alignments). Please define either (1) _ENABLE_EXTENDED_ALIGNED_STORAGE to acknowledge that you understand this message and that you actually want a type with an extended alignment, or (2) _DISABLE_EXTENDED_ALIGNED_STORAGE to silence this message and get the old non-conformant behavior. bundle_adjuster C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\VC\Tools\MSVC\14.16.27023\include\type_traits 1271

When I use #define _ENABLE_EXTENDED_ALIGNED_STORAGE or #define _DISABLE_EXTENDED_ALIGNED_STORAG smal_gcip It will become very slow。
I hope you can help handle this issue Thank you

[koide3]

I suppose the error stems from improper handling of vectorization in Eigen. Can you try disabling vectorization by adding EIGEN_DONT_ALIGN? It may slightly decrease the processing speed, but the degradation should be small.
http://eigen.tuxfamily.org/index.php?title=FAQ