changed the definition of EIGEN_HAS_CONSTEXPR such that it is only set for C++14 compilers. This is needlessly strict and breaks the IndexLists mechanism used to infer tensor shapes and sizes at compile time in TensorFlow.
It also breaks certain legacy builds internal to Google that rely on IndexList.
I meant to say that it "disables the IndexLists mechanism", i.e.
Friendly ping. Can we revert this particular part of the change?
hm, I don't see how this commit change anything regarding EIGEN_HAS_CONSTEXPR. AFAIK we always required c++14 to enable EIGEN_HAS_CONSTEXPR.
I added Benoit Steiner in CC as I think its him who first introduced EIGEN_HAS_CONSTEXPR.
Maybe we should define two variants to handle cases for which relaxed constexpr is not required?
Yes, having two levels of support would be my preference too.
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