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Issue created by Martin Heistermann@mheistermannDeveloper

Eigen tests fail to compile on Linux with Eigen 3.3.7

With both clang 9.0.1-10 and g++ 9.3.0, and Eigen 3.3.7 on Debian Testing, the eigen related unit tests fail to compile. CI on Linux apparently currently has no Eigen, so this is not tested. Compile output:

Clang:

/usr/lib/ccache/clang++  -DENABLE_EIGEN3_TEST -DINCLUDE_TEMPLATES -DTEST_DOUBLE_TRAITS -I../src/Unittests/.. -I../src/Unittests -I/usr/include/eigen3 -I../src/OpenMesh/Core/../.. -I../src/OpenMesh/Tools/../.. -O3 -DNDEBUG -DINCLUDE_TEMPLATES  -W  -Wall  -Wextra  -Wno-non-virtual-dtor  -Wno-unused-parameter  -Wno-variadic-macros  -DNDEBUG  -DINCLUDE_TEMPLATES  -W  -Wall  -Wextra  -Wno-non-virtual-dtor  -Wno-unused-parameter  -Wno-variadic-macros  -DNDEBUG    -g -pedantic -Wno-long-long -std=gnu++11 -MD -MT src/Unittests/CMakeFiles/unittests_doublevec.dir/unittests_eigen3_type.cc.o -MF src/Unittests/CMakeFiles/unittests_doublevec.dir/unittests_eigen3_type.cc.o.d -o src/Unittests/CMakeFiles/unittests_doublevec.dir/unittests_eigen3_type.cc.o -c ../src/Unittests/unittests_eigen3_type.cc
../src/Unittests/unittests_eigen3_type.cc:98:3: error: temporary of type 'MatrixBase<Eigen::Matrix<double, 3, 1, 0, 3, 1> >' has protected destructor
  normalize(normal);
  ^
/usr/include/eigen3/Eigen/src/Core/MatrixBase.h:468:5: note: declared protected here
    EIGEN_DEFAULT_EMPTY_CONSTRUCTOR_AND_DESTRUCTOR(MatrixBase)
    ^
/usr/include/eigen3/Eigen/src/Core/util/Macros.h:870:23: note: expanded from macro 'EIGEN_DEFAULT_EMPTY_CONSTRUCTOR_AND_DESTRUCTOR'
    EIGEN_DEVICE_FUNC ~Derived() = default;
                      ^
../src/Unittests/unittests_eigen3_type.cc:104:3: error: temporary of type 'MatrixBase<Eigen::Matrix<double, 3, 1, 0, 3, 1> >' has protected destructor
  normalize(normal);
  ^
/usr/include/eigen3/Eigen/src/Core/MatrixBase.h:468:5: note: declared protected here
    EIGEN_DEFAULT_EMPTY_CONSTRUCTOR_AND_DESTRUCTOR(MatrixBase)
    ^
/usr/include/eigen3/Eigen/src/Core/util/Macros.h:870:23: note: expanded from macro 'EIGEN_DEFAULT_EMPTY_CONSTRUCTOR_AND_DESTRUCTOR'
    EIGEN_DEVICE_FUNC ~Derived() = default;
                      ^
In file included from ../src/Unittests/unittests_eigen3_type.cc:14:
../src/Unittests/../OpenMesh/Core/Geometry/EigenVectorT.hh:93:14: error: calling a protected constructor of class 'Eigen::MatrixBase<Eigen::Matrix<double, 3, 1, 0, 3, 1> >'
      return x;
             ^
../src/Unittests/unittests_eigen3_type.cc:98:3: note: in instantiation of function template specialization 'Eigen::normalize<Eigen::Matrix<double, 3, 1, 0, 3, 1> >' requested here
  normalize(normal);
  ^
/usr/include/eigen3/Eigen/src/Core/MatrixBase.h:467:36: note: declared protected here
    EIGEN_DEFAULT_COPY_CONSTRUCTOR(MatrixBase)
                                   ^
In file included from ../src/Unittests/unittests_eigen3_type.cc:5:
In file included from ../src/Unittests/../Unittests/unittests_common.hh:7:
In file included from ../src/Unittests/../OpenMesh/Core/Mesh/TriMesh_ArrayKernelT.hh:64:
In file included from ../src/Unittests/../OpenMesh/Core/Mesh/TriMeshT.hh:60:
In file included from ../src/Unittests/../OpenMesh/Core/Mesh/PolyMeshT.hh:663:
../src/Unittests/../OpenMesh/Core/Mesh/PolyMeshT_impl.hh:407:12: error: temporary of type 'MatrixBase<Eigen::Matrix<double, 3, 1, 0, 3, 1> >' has protected destructor
    return normalize(n);
           ^
../src/Unittests/unittests_eigen3_type.cc:28:7: note: in instantiation of member function 'OpenMesh::PolyMeshT<OpenMesh::AttribKernelT<OpenMesh::FinalMeshItemsT<EigenTraits, true>, OpenMesh::TriConnectivity> >::calc_halfedge_normal' requested here
class OpenMeshEigenTest : public testing::Test {
      ^
/usr/include/eigen3/Eigen/src/Core/MatrixBase.h:468:5: note: declared protected here
    EIGEN_DEFAULT_EMPTY_CONSTRUCTOR_AND_DESTRUCTOR(MatrixBase)
    ^
/usr/include/eigen3/Eigen/src/Core/util/Macros.h:870:23: note: expanded from macro 'EIGEN_DEFAULT_EMPTY_CONSTRUCTOR_AND_DESTRUCTOR'
    EIGEN_DEVICE_FUNC ~Derived() = default;
                      ^
4 errors generated.

GCC:

/usr/lib/ccache/c++  -DENABLE_EIGEN3_TEST -DINCLUDE_TEMPLATES -DTEST_DOUBLE_TRAITS -I../src/Unittests/.. -I../src/Unittests -I/usr/include/eigen3 -I../src/OpenMesh/Core/../.. -I../src/OpenMesh/Tools/../.. -O3 -DNDEBUG -DINCLUDE_TEMPLATES  -W  -Wall  -Wno-unused  -Wextra  -Wno-variadic-macros  -DNDEBUG  -DINCLUDE_TEMPLATES  -W  -Wall  -Wno-unused  -Wextra  -Wno-variadic-macros  -DNDEBUG    -g -pedantic -Wno-long-long -std=gnu++11 -MD -MT src/Unittests/CMakeFiles/unittests_doublevec.dir/unittests_eigen3_type.cc.o -MF src/Unittests/CMakeFiles/unittests_doublevec.dir/unittests_eigen3_type.cc.o.d -o src/Unittests/CMakeFiles/unittests_doublevec.dir/unittests_eigen3_type.cc.o -c ../src/Unittests/unittests_eigen3_type.cc
../src/Unittests/unittests_eigen3_type.cc: In member function ‘virtual void {anonymous}::OpenMeshEigenTest_Test_external_normalize_Test::TestBody()’:
../src/Unittests/unittests_eigen3_type.cc:98:19: error: ‘Eigen::MatrixBase<Derived>::~MatrixBase() [with Derived = Eigen::Matrix<double, 3, 1>]’ is protected within this context
   98 |   normalize(normal);
      |                   ^
In file included from /usr/include/eigen3/Eigen/Core:88,
                 from ../src/Unittests/../OpenMesh/Core/Geometry/EigenVectorT.hh:47,
                 from ../src/Unittests/unittests_eigen3_type.cc:14:
/usr/include/eigen3/Eigen/src/Core/util/Macros.h:870:23: note: declared protected here
  870 |     EIGEN_DEVICE_FUNC ~Derived() = default;
      |                       ^
/usr/include/eigen3/Eigen/src/Core/MatrixBase.h:468:5: note: in expansion of macro ‘EIGEN_DEFAULT_EMPTY_CONSTRUCTOR_AND_DESTRUCTOR’
  468 |     EIGEN_DEFAULT_EMPTY_CONSTRUCTOR_AND_DESTRUCTOR(MatrixBase)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../src/Unittests/unittests_eigen3_type.cc:104:19: error: ‘Eigen::MatrixBase<Derived>::~MatrixBase() [with Derived = Eigen::Matrix<double, 3, 1>]’ is protected within this context
  104 |   normalize(normal);
      |                   ^
In file included from /usr/include/eigen3/Eigen/Core:88,
                 from ../src/Unittests/../OpenMesh/Core/Geometry/EigenVectorT.hh:47,
                 from ../src/Unittests/unittests_eigen3_type.cc:14:
/usr/include/eigen3/Eigen/src/Core/util/Macros.h:870:23: note: declared protected here
  870 |     EIGEN_DEVICE_FUNC ~Derived() = default;
      |                       ^
/usr/include/eigen3/Eigen/src/Core/MatrixBase.h:468:5: note: in expansion of macro ‘EIGEN_DEFAULT_EMPTY_CONSTRUCTOR_AND_DESTRUCTOR’
  468 |     EIGEN_DEFAULT_EMPTY_CONSTRUCTOR_AND_DESTRUCTOR(MatrixBase)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../src/Unittests/unittests_eigen3_type.cc:14:
../src/Unittests/../OpenMesh/Core/Geometry/EigenVectorT.hh: In instantiation of ‘Eigen::MatrixBase<Derived> Eigen::normalize(Eigen::MatrixBase<Derived>&) [with Derived = Eigen::Matrix<double, 3, 1>]’:
../src/Unittests/unittests_eigen3_type.cc:98:19:   required from here
../src/Unittests/../OpenMesh/Core/Geometry/EigenVectorT.hh:93:14: error: ‘constexpr Eigen::MatrixBase<Derived>::MatrixBase(const Eigen::MatrixBase<Derived>&) [with Derived = Eigen::Matrix<double, 3, 1>]’ is protected within this context
   93 |       return x;
      |              ^
In file included from /usr/include/eigen3/Eigen/Core:88,
                 from ../src/Unittests/../OpenMesh/Core/Geometry/EigenVectorT.hh:47,
                 from ../src/Unittests/unittests_eigen3_type.cc:14:
/usr/include/eigen3/Eigen/src/Core/MatrixBase.h:467:36: note: declared protected here
  467 |     EIGEN_DEFAULT_COPY_CONSTRUCTOR(MatrixBase)
      |                                    ^~~~~~~~~~
/usr/include/eigen3/Eigen/src/Core/util/Macros.h:844:65: note: in definition of macro ‘EIGEN_DEFAULT_COPY_CONSTRUCTOR’
  844 | #define EIGEN_DEFAULT_COPY_CONSTRUCTOR(CLASS) EIGEN_DEVICE_FUNC CLASS(const CLASS&) = default;
      |                                                                 ^~~~~
In file included from ../src/Unittests/unittests_eigen3_type.cc:14:
../src/Unittests/../OpenMesh/Core/Geometry/EigenVectorT.hh:93:14: error: ‘Eigen::MatrixBase<Derived>::~MatrixBase() [with Derived = Eigen::Matrix<double, 3, 1>]’ is protected within this context
   93 |       return x;
      |              ^
In file included from /usr/include/eigen3/Eigen/Core:88,
                 from ../src/Unittests/../OpenMesh/Core/Geometry/EigenVectorT.hh:47,
                 from ../src/Unittests/unittests_eigen3_type.cc:14:
/usr/include/eigen3/Eigen/src/Core/util/Macros.h:870:23: note: declared protected here
  870 |     EIGEN_DEVICE_FUNC ~Derived() = default;
      |                       ^
/usr/include/eigen3/Eigen/src/Core/MatrixBase.h:468:5: note: in expansion of macro ‘EIGEN_DEFAULT_EMPTY_CONSTRUCTOR_AND_DESTRUCTOR’
  468 |     EIGEN_DEFAULT_EMPTY_CONSTRUCTOR_AND_DESTRUCTOR(MatrixBase)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../src/Unittests/../OpenMesh/Core/Mesh/PolyMeshT.hh:663,
                 from ../src/Unittests/../OpenMesh/Core/Mesh/TriMeshT.hh:60,
                 from ../src/Unittests/../OpenMesh/Core/Mesh/TriMesh_ArrayKernelT.hh:64,
                 from ../src/Unittests/../Unittests/unittests_common.hh:7,
                 from ../src/Unittests/unittests_eigen3_type.cc:5:
../src/Unittests/../OpenMesh/Core/Mesh/PolyMeshT_impl.hh: In instantiation of ‘OpenMesh::PolyMeshT<Kernel>::Normal OpenMesh::PolyMeshT<Kernel>::calc_halfedge_normal(OpenMesh::PolyMeshT<Kernel>::HalfedgeHandle, double) const [with Kernel = OpenMesh::AttribKernelT<OpenMesh::FinalMeshItemsT<EigenTraits, true>, OpenMesh::TriConnectivity>; OpenMesh::PolyMeshT<Kernel>::Normal = Eigen::Matrix<double, 3, 1>; OpenMesh::PolyMeshT<Kernel>::HalfedgeHandle = OpenMesh::HalfedgeHandle]’:
../src/Unittests/../OpenMesh/Core/Mesh/PolyMeshT_impl.hh:355:29:   required from ‘void OpenMesh::PolyMeshT<Kernel>::update_halfedge_normals(double) [with Kernel = OpenMesh::AttribKernelT<OpenMesh::FinalMeshItemsT<EigenTraits, true>, OpenMesh::TriConnectivity>]’
../src/Unittests/../OpenMesh/Core/Mesh/PolyMeshT_impl.hh:324:41:   required from ‘void OpenMesh::PolyMeshT<Kernel>::update_normals() [with Kernel = OpenMesh::AttribKernelT<OpenMesh::FinalMeshItemsT<EigenTraits, true>, OpenMesh::TriConnectivity>]’
../src/Unittests/unittests_eigen3_type.cc:235:25:   required from here
../src/Unittests/../OpenMesh/Core/Mesh/PolyMeshT_impl.hh:407:21: error: ‘Eigen::MatrixBase<Derived>::~MatrixBase() [with Derived = Eigen::Matrix<double, 3, 1>]’ is protected within this context
  407 |     return normalize(n);
      |            ~~~~~~~~~^~~
In file included from /usr/include/eigen3/Eigen/Core:88,
                 from ../src/Unittests/../OpenMesh/Core/Geometry/EigenVectorT.hh:47,
                 from ../src/Unittests/unittests_eigen3_type.cc:14:
/usr/include/eigen3/Eigen/src/Core/util/Macros.h:870:23: note: declared protected here
  870 |     EIGEN_DEVICE_FUNC ~Derived() = default;
      |                       ^
/usr/include/eigen3/Eigen/src/Core/MatrixBase.h:468:5: note: in expansion of macro ‘EIGEN_DEFAULT_EMPTY_CONSTRUCTOR_AND_DESTRUCTOR’
  468 |     EIGEN_DEFAULT_EMPTY_CONSTRUCTOR_AND_DESTRUCTOR(MatrixBase)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~