As found on this SO post:
Eigen fails to work with MPFR if compiled with `-DEIGEN_MAX_ALIGN_BYTES=0`.
The reason appears to be that the specific type used in the example requires 16 byte alignment, which however is ignored by `ei_declare_aligned_stack_constructed_variable`.
Similar issues likely arise for custom types which require more than the standard alignment.
Do we re
Do we really want to fix that one? I mean compiling with `-DEIGEN_MAX_ALIGN_BYTES=0` while using a scalar type requiring over-alignment at the same time does not looks right to me. I'm not against a fix, but I see it as low priority.
Ok, good point. We could statically assert, if someone tries to use an over-aligned type. But that requires some code to make sure that PODs don't break (e.g., alignof(double)==8 on many platforms).
--> Changed to blocking 3.x
Also, we don't really have a good mechanism to individually set the alignment of types (and I don't see good solutions without breaking the API ...)
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