cmake cannot locate Eigen root folder correctly

[ghost]

Following are the error messages when I ran cmake -G"Visual Studio 14 2015 Win64" ..:

-- No preference for use of exported Eigen CMake configuration set, and no hints for include directory provided. Defaulting to preferring an installed/exported Eigen CMake configuration if available. -- Failed to find installed Eigen CMake configuration, searching for Eigen build directories exported with CMake. -- Found exported Eigen build directory: D:/3rd-parties/eigen-3.3.7/build CMake Error at cmake/FindEigen.cmake:89 (message): Failed to find Eigen - Could not find file: D://include/eigen3/Eigen/src/Core/util/Macros.h containing version information in Eigen install located at: D://include/eigen3.

The cmake script has successfully found the exported Eigen build directory, but it seems that it then failed to assemble the correct path to Macros.h according to that. The root folder of Eigen is one level above the build directory, i.e., D:/3rd-parties/eigen-3.3.7. As a result, the correct filepath should be D:/3rd-parties/eigen-3.3.7/Eigen/src/Core/util/Macros.h, not D://include/eigen3/Eigen/.... So, could you please fix this issue in FindEigen.cmake? Thanks a lot.

My environment:

• Windows 10
• CMake 3.15.3
• Visual Studio 2015

[hjwdzh]

Can you check why it locates the path to "D://include/eigen3/Eigen"? I think the FindEigen.cmake is a standard file and should not be casually changed.

[mlikens]

I changed line 115 in FindEigen.cmake to set(EIGEN_PREFER_EXPORTED_EIGEN_CMAKE_CONFIGURATION FALSE) and it fixed this issue for me

I also added a custom path to the list at line 190, however I am not sure this is necessary