Sophus, control reaches end of non void function. [closed]

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I am using Eigen 3.0.5 and gcc 4.9. Whenever I try to compile the sophus library, I get the following error. I am trying to compile it in association with tum visions dvo_slam : https://github.com/tum-vision/dvo_slam

`/home/devel/dvo_test/sandbox/dvo_slam/sophus/sophus_src/sophus/rxso3.hpp:362:3: error: control reaches end of non-void function [-Werror=return-type] } ^ /home/devel/dvo_test/sandbox/dvo_slam/sophus/sophus_src/sophus/rxso3.hpp: In member function ‘Sophus::RxSO3Base<Derived>::Transformation Sophus::RxSO3Base<Derived>::rotationMatrix() const [with Derived = Sophus::RxSO3<float>; Sophus::RxSO3Base<Derived>::Transformation = Eigen::Matrix<float, 3, 3>; typename Eigen::internal::traits<T>::Scalar = float]’: /home/devel/dvo_test/sandbox/dvo_slam/sophus/sophus_src/sophus/rxso3.hpp:254:3: error: control reaches end of non-void function [-Werror=return-type] } ^ /home/devel/dvo_test/sandbox/dvo_slam/sophus/sophus_src/sophus/rxso3.hpp: In member function ‘Sophus::RxSO3<typename Eigen::internal::traits<T>::Scalar> Sophus::RxSO3Base<Derived>::inverse() const [with Derived = Sophus::RxSO3<float>; typename Eigen::internal::traits<T>::Scalar = float]’: /home/devel/dvo_test/sandbox/dvo_slam/sophus/sophus_src/sophus/rxso3.hpp:124:3: error: control reaches end of non-void function [-Werror=return-type] } ^ /home/devel/dvo_test/sandbox/dvo_slam/sophus/sophus_src/sophus/rxso3.hpp: In member function ‘const Eigen::Quaternion<Scalar_>& Sophus::RxSO3<Scalar_, Options>::quaternion() const [with Scalar_ = float; int Options = 0]’: /home/devel/dvo_test/sandbox/dvo_slam/sophus/sophus_src/sophus/rxso3.hpp:576:3: error: control reaches end of non-void function [-Werror=return-type] } ^ In file included from /home/devel/dvo_test/sandbox/dvo_slam/sophus/sophus_src/sophus/rxso3.hpp:4:0, from /home/devel/dvo_test/sandbox/dvo_slam/sophus/sophus_src/test/core/test_rxso3.cpp:3: /home/devel/dvo_test/sandbox/dvo_slam/sophus/sophus_src/sophus/so3.hpp: In static member function ‘static Sophus::SO3Base<Derived>::Tangent Sophus::SO3Base<Derived>::logAndTheta(const Sophus::SO3<typename Eigen::internal::traits<T>::Scalar>&, Sophus::SO3Base<Derived>::Scalar*) [with Derived = Sophus::SO3<float>; Sophus::SO3Base<Derived>::Tangent = Eigen::Matrix<float, 3, 1>; typename Eigen::internal::traits<T>::Scalar = float; Sophus::SO3Base<Derived>::Scalar = float]’: /home/devel/dvo_test/sandbox/dvo_slam/sophus/sophus_src/sophus/so3.hpp:455:3: error: control reaches end of non-void function [-Werror=return-type] } ^ In file included from /home/devel/dvo_test/sandbox/dvo_slam/sophus/sophus_src/test/core/test_rxso3.cpp:3:0: /home/devel/dvo_test/sandbox/dvo_slam/sophus/sophus_src/sophus/rxso3.hpp: In member function ‘Sophus::RxSO3Base<Derived>::Point Sophus::RxSO3Base<Derived>::operator*(const Point&) const [with Derived = Sophus::RxSO3<float>; Sophus::RxSO3Base<Derived>::Point = Eigen::Matrix<float, 3, 1>; typename Eigen::internal::traits<T>::Scalar = float]’: /home/devel/dvo_test/sandbox/dvo_slam/sophus/sophus_src/sophus/rxso3.hpp:211:3: error: control reaches end of non-void function [-Werror=return-type] } ^ In file included from /home/devel/dvo_test/sandbox/dvo_slam/sophus/sophus_src/test/core/tests.hpp:9:0, from /home/devel/dvo_test/sandbox/dvo_slam/sophus/sophus_src/test/core/test_rxso3.cpp:4: /home/devel/dvo_test/sandbox/dvo_slam/sophus/sophus_src/sophus/average.hpp: In function ‘Sophus::enable_if_t<std::is_same<typename SequenceContainer::value_type, Sophus::RxSO3<Scalar> >::value, Sophus::optional<typename SequenceContainer::value_type> > Sophus::average(const SequenceContainer&) [with SequenceContainer = std::array<Sophus::RxSO3<float>, 2u ...