Target link Eigen library on Clion fails - c++

Question

I am trying to link eigen to my project on clion, but the following error is printed:
This is my cmakelist file with all the attempts to link the library:
cmake_minimum_required(VERSION 2.8.3)
project(planner_standalone_grasp)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O0")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-diagnostics-color")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
# find all cpp files in currect directory (where CMakeLists.txt is)
file(GLOB SOURCE_FILES FILES_MATCHING PATTERN "./src/*.cpp")
include_directories(src)
add_executable(${PROJECT_NAME} main.cpp ${SOURCE_FILES})
set(EXE_LIBS
ctop_common
ctop_log
ctop_util
eigen
crl
crl-algorithm
crl-loader
crl-tsplib
yaml-cpp
)
target_link_directories(${PROJECT_NAME} PUBLIC lib/comrob/lib/)
target_link_directories(${PROJECT_NAME} PUBLIC ctop/common/cmake-build-debug/)
target_link_directories(${PROJECT_NAME} PUBLIC ctop/log/cmake-build-debug/)
target_link_directories(${PROJECT_NAME} PUBLIC ctop/util/cmake-build-debug/)
set(EIGEN_DIR "/usr/local/include/Eigen/")
include_directories(${EIGEN_DIR})
find_package (Eigen3 3.3 REQUIRED NO_MODULE)
target_link_libraries (${PROJECT_NAME} Eigen3::Eigen)
target_link_directories(${PROJECT_NAME} PUBLIC lib/eigen/Eigen/)
target_link_directories(${PROJECT_NAME} PUBLIC /usr/local/include/Eigen/)
target_link_directories(${PROJECT_NAME} PUBLIC /usr/local/include/eigen3/Eigen/)
target_link_libraries(${PROJECT_NAME} ${EXE_LIBS})
All other libraries in the project are successfully linked except Eigen - This is the error message:
[6/6] Linking CXX executable planner_standalone_grasp
FAILED: planner_standalone_grasp
: && /usr/bin/c++ -O0 -fno-diagnostics-color -std=c++17 -g -rdynamic CMakeFiles/planner_standalone_grasp.dir/main.cpp.o CMakeFiles/planner_standalone_grasp.dir/src/Grasp.cpp.o CMakeFiles/planner_standalone_grasp.dir/src/WallEdge.cpp.o CMakeFiles/planner_standalone_grasp.dir/src/WallGraph.cpp.o CMakeFiles/planner_standalone_grasp.dir/src/pt2eigen.cpp.o -o planner_standalone_grasp -L/home/sim/CLionProjects/Test/lib/comrob/lib -L/home/sim/CLionProjects/Test/ctop/common/cmake-build-debug -L/home/sim/CLionProjects/Test/ctop/log/cmake-build-debug -L/home/sim/CLionProjects/Test/ctop/util/cmake-build-debug -L/home/sim/CLionProjects/Test/lib/eigen/Eigen -L/usr/local/include/Eigen -L/usr/local/include/eigen3/Eigen -Wl,-rpath,/home/sim/CLionProjects/Test/lib/comrob/lib:/home/sim/CLionProjects/Test/ctop/common/cmake-build-debug:/home/sim/CLionProjects/Test/ctop/log/cmake-build-debug:/home/sim/CLionProjects/Test/ctop/util/cmake-build-debug:/home/sim/CLionProjects/Test/lib/eigen/Eigen:/usr/local/include/Eigen:/usr/local/include/eigen3/Eigen -lctop_common -lctop_log -lctop_util -leigen -lcrl -lcrl-algorithm -lcrl-loader -lcrl-tsplib -lyaml-cpp && :
/usr/bin/ld: cannot find -leigen
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.
Any help would be highly appreciated!

Answer 1

In my experience there is two possible causes for this issue:
there is no library named libeigen. in the provided directories (the ones in target_link_directories). Perhaps the path is wrong?
You should know that usually library files are not located in the include directories of a repository...
there is a library named as such, though it was compiled for the wrong platform... i.e. a library compiled for linux cannot be linked if you are making an executable for windows. Usually you can find the source code and compile it yourself.
Hope this helps.