[linux] undefined reference to Eigen::Matrix<double, ....

What steps will reproduce the problem?
1. checkout revision r530
2. configure with BUILD_TOOLS, BTK_USE_VISSUPPORT, BTK_USE_VTK
3. run make

What is the expected output? What do you see instead?
Expected output:
Linking CXX executable ../../bin/Mokka
[100%] Built target Mokka

instead:
Linking CXX executable ../../bin/Mokka
../../bin/libBTKVTK.a(btkVTKForcePlatformsSource.cpp.o): In function 
`btk::VTKForcePlatformsSource::RequestData(vtkInformation*, 
vtkInformationVector**, vtkInformationVector*)':
btkVTKForcePlatformsSource.cpp:(.text+0xa4b): undefined reference to 
`Eigen::Matrix<double, 3, 1, 2, 3, 1> 
Eigen::MatrixBase<Eigen::Block<Eigen::Matrix<double, 3, 3, 2, 3, 3>, 3, 1, 1, 
32> >::cross<Eigen::CwiseBinaryOp<Eigen::ei_scalar_difference_op<double>, 
Eigen::Block<Eigen::Matrix<double, 3, 4, 2, 3, 4>, 3, 1, 1, 32>, 
Eigen::Block<Eigen::Matrix<double, 3, 4, 2, 3, 4>, 3, 1, 1, 32> > 
>(Eigen::MatrixBase<Eigen::CwiseBinaryOp<Eigen::ei_scalar_difference_op<double>,
 Eigen::Block<Eigen::Matrix<double, 3, 4, 2, 3, 4>, 3, 1, 1, 32>, 
Eigen::Block<Eigen::Matrix<double, 3, 4, 2, 3, 4>, 3, 1, 1, 32> > > const&) 
const'
btkVTKForcePlatformsSource.cpp:(.text+0xb0e): undefined reference to 
`Eigen::Matrix<double, 3, 1, 2, 3, 1> 
Eigen::MatrixBase<Eigen::Block<Eigen::Matrix<double, 3, 3, 2, 3, 3>, 3, 1, 1, 
32> >::cross<Eigen::Block<Eigen::Matrix<double, 3, 3, 2, 3, 3>, 3, 1, 1, 32> 
>(Eigen::MatrixBase<Eigen::Block<Eigen::Matrix<double, 3, 3, 2, 3, 3>, 3, 1, 1, 
32> > const&) const'
collect2: ld returned 1 exit status
make[2]: *** [bin/Mokka] Error 1
make[1]: *** [Tools/Mokka/CMakeFiles/Mokka.dir/all] Error 2

What version of the product are you using? On what operating system?
Ubuntu 10.10

Please provide any additional information below.
After adding '#include <Eigen/Eigen>' to the file 
Code/VisSupport/VTK/btkVTKForcePlatformsSource.cpp everything works fine

Original issue reported on code.google.com by martin.f...@gmail.com on 30 Nov 2010 at 10:19

damian-666 / b-tk

[linux] undefined reference to Eigen::Matrix<double, .... #6