Commits on Aug 29, 2022

1. Add option to compile Eigen with alignment enabled …

   Eigen is most optimal when using SIMD instructions which require
   overaligned buffers. In C++14 this is a problem because there's no
   built-in support for correctly aligned allocations, so this Eigen
   feature is currently disabled in AliceVision. C++17 solves Eigen
   alignment issues completely because there now exist additional overloads
   of operator new() which support correct allocation alignment. We can't
   upgrade to C++17 yet, but certain compilers added support for this
   feature earlier, such as -faligned-new in GCC 7.1. Therefore it makes
   sense to add a configuration option to allow enabling alignment support
   in Eigen in cases when the compiler is good enough.

   

   p12tic committed Aug 29, 2022
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