ROS dependency for build in Ubuntu ?

[Beuh]

Hi,

Trying to build the lib under ubuntu 12.04, I get errors. Everything is installed as it should, but when I run cmake I get the following error :

CMake Error at CMakeLists.txt:31 (find_package): Could not find module FindEigen.cmake or a configuration file for package Eigen.

Line 31 is actually "find_package(Eigen REQUIRED)". In Ubuntu (and maybe other distros) there is no provided FindEigen.cmake script system-wide, hence the error.

Now, I saw that there was a manifest.xml file and a Makefile.ros in the main folder, so I tried to build in a ros-aware shell (by sourcing the ros config files) and it builds flawlessly. Reason is that ROS (groovy for me) comes with a FindEigen.cmake file in its config. Both rosbuild and a simple cmake + make in a ros-aware shell work.

I don't have time now to make a patch and submit, but a simple solution could be to have a cmake subfolder containing a FindEigen.cmake script and add this line in the CMakeLists.txt :

list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)

On my config, using the FindEigen.cmake provided in ROS here works : https://code.ros.org/svn/ros-pkg/stacks/laser_pipeline/trunk/laser_geometry/cmake/FindEigen.cmake

Cheers,

Beuh

[jkua]

I ran into similar issues with Ubuntu 12.04. I also downloaded the FindEigen.cmake file above, stuck it in my build directory and ran cmake: cmake .. -DCMAKE_MODULE_PATH=<path to build dir>

However, make still failed with: /usr/include/eigen3/unsupported/Eigen/NonLinearOptimization:30:22: fatal error: Eigen/Core: No such file or directory

Running make VERBOSE=1 showed that eigen was not in the include path. This was because FindEigen.cmake was setting EIGEN_INCLUDE_PATH and CMakeLists.txt was looking for Eigen_INCLUDE_PATH. Modifying the latter solved the problem.

[laurentkneip]

Thanks for these comments guys. I have ROS so I didn't notice. I added the FindEigen.cmake file, it should work now.