Simple mesh with mshr and c++, weird error ?

Question

Hello everyone,

I am new to Fenics and I want to create a polygonal mesh with a hole in it.

I have written

// Create mesh and function space
    //UnitSquareMesh mesh(32, 32);
    // Vector of points
    std::vector<Point> pts;
    pts.push_back(Point(  0.0,   0.0));
    pts.push_back(Point(  4.0,   0.0));
    pts.push_back(Point(  4.0,   8.0));
    pts.push_back(Point(  0.0,   8.0));
    pts.push_back(Point(  0.0,   8.0 / 2 + 0.5));
    pts.push_back(Point(  1.0,   8.0 / 2 + 0.5));
    pts.push_back(Point(  2.0,   8.0 / 4      ));
    pts.push_back(Point(  1.0,   8.0 / 2 - 0.5));
    pts.push_back(Point(  0.0,   8.0 / 2 - 0.5));

    // Polygone
    mshr::Polygon polyline(pts);

    // Hole
    mshr::Circle circle(Point(2.0, 7.0), 0.3);

    // Difference: IT IS A SHARED POINTER
    auto difference = polyline - circle;

    // Create a simple mesh
    Mesh mesh;

    mshr::CSGCGALMeshGenerator2D generator;

    // Mesh it!
    generator.generate(*difference, mesh);

But I keep getting following error :

Scanning dependencies of target demo_poisson [ 50%] Building CXX
object CMakeFiles/demo_poisson.dir/main.cpp.o [100%] Linking CXX
executable demo_poisson CMakeFiles/demo_poisson.dir/main.cpp.o: In
function mshr::CSGDifference::~CSGDifference()': /home/fenics/local/include/mshr/CSGOperators.h:67: undefined reference tovtable for mshr::CSGDifference'
CMakeFiles/demo_poisson.dir/main.cpp.o: In function
mshr::CSGOperator::~CSGOperator()': /home/fenics/local/include/mshr/CSGOperators.h:33: undefined reference tomshr::CSGGeometry::~CSGGeometry()'
CMakeFiles/demo_poisson.dir/main.cpp.o: In function
`mshr::CSGDifference::~CSGDifference()': ....

:_(

Anyone knows what is going on here ? Any help is appreciated, thanks in advance.

Simple mesh with mshr and c++, weird error ?

1 Answer