Eigen fails to compile with GCC 4.6; missing #include <cstddef> for ptrdiff_t

Submitted by Christoph

Assigned to Nobody

Eigen uses the "ptrdiff_t" datatype, but does not #include <cstddef>

This causes a compilation error on standard includes shipped with GCC 4.6.

Edited Dec 05, 2019 by Eigen Bugzilla