In one of my projects, I recently upgraded Eigen to v. 3.2.8, and when building in XCode 7.3.1, I now get several errors like these: ...../Eigen/eigen/Eigen/src/Core/DenseStorage.h:277:21: No member named 'move' in namespace 'std'; did you mean 'modf'?

Do I need a specific compiler version to build in XCode?
I also noticed there is a preprocessor definition EIGEN_HAVE_RVALUE_REFERENCES that is #ifdef'd upon. A C++ 11 move semantics thing I guess?
Does Eigen build without C++ 11 support? Should I undefine that macro somewhere?
And does this have relevant speed implications?

Koen

I've xcode 7.3.0 but cannot reproduce. Could you paste your compiler flags? In particular does it includes -std=c++11? Finally, what if you add:

#include <utility>

before including any Eigen's header?

Thanks for the fast follow-up!

Under the Apple LLVM 7.1 - Language - C++ settings, the C++ Language Dialect was set to C++11 [-std=c++11] .
However, C++ Standard Library was set to Compiler Default, which appears to be libstdc++ (GNU C++ standard library).
When I changed this to libc++ (LLVM C++ standard library with C++ 11 support), the errors went away and the Eigen code built just fine.

Also, if I changed C++ Language Dialect to -std=gnu++98, and C++ standard library to libstdc++, the errors also disappear.

So it was just a configuration issue in my Xcode project and all is fine with Eigen!

Koen

Indeed, libstdc++ does not support c++11