Compile Problem : Can't find Eigen "Eigen/Core: No such file or directory"

[illusionaireal]

The package can't locate my Eigen in my computer.

after
$ catkin_make -DCATKIN_WHITELIST_PACKAGES="numpy_eigen"

My system is Ubuntu 18.04 ,and the ros version is melodic.

The error I get :

####
#### Running command: "make cmake_check_build_system" in "/home/***/catkin_test/build"
####
CMake Warning (dev) in CMakeLists.txt:
  No project() command is present.  The top-level CMakeLists.txt file must
  contain a literal, direct call to the project() command.  Add a line of
  code such as

    project(ProjectName)

  near the top of the file, but after cmake_minimum_required().

  CMake is pretending there is a "project(Project)" command on the first
  line.
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Deprecation Warning at CMakeLists.txt:4 (cmake_minimum_required):
  Compatibility with CMake < 2.8.12 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.


-- Using CATKIN_DEVEL_PREFIX: /home/***/catkin_test/devel
-- Using CMAKE_PREFIX_PATH: /home/***/catkin_test/devel;/opt/ros/melodic
-- This workspace overlays: /home/***/catkin_test/devel;/opt/ros/melodic
-- Found PythonInterp: /usr/bin/python3 (found suitable version "3.6.9", minimum required is "2") 
-- Using PYTHON_EXECUTABLE: /usr/bin/python3
-- Using Debian Python package layout
-- Using empy: /usr/bin/empy
-- Using CATKIN_ENABLE_TESTING: ON
-- Call enable_testing()
-- Using CATKIN_TEST_RESULTS_DIR: /home/***/catkin_test/build/test_results
-- Found gtest sources under '/usr/src/googletest': gtests will be built
-- Found gmock sources under '/usr/src/googletest': gmock will be built
CMake Deprecation Warning at /usr/src/googletest/CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 2.8.12 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.


CMake Deprecation Warning at /usr/src/googletest/googlemock/CMakeLists.txt:41 (cmake_minimum_required):
  Compatibility with CMake < 2.8.12 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.


CMake Deprecation Warning at /usr/src/googletest/googletest/CMakeLists.txt:48 (cmake_minimum_required):
  Compatibility with CMake < 2.8.12 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.


-- Found PythonInterp: /usr/bin/python3 (found version "3.6.9") 
-- Using Python nosetests: /usr/bin/nosetests
-- catkin 0.7.29
-- BUILD_SHARED_LIBS is on
-- BUILD_SHARED_LIBS is on
-- Using CATKIN_WHITELIST_PACKAGES: numpy_eigen
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- ~~  traversing 1 packages in topological order:
-- ~~  - numpy_eigen
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- +++ processing catkin package: 'numpy_eigen'
-- ==> add_subdirectory(numpy_eigen)
CMake Deprecation Warning at numpy_eigen/CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 2.8.12 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.


-- Found Boost: /usr/include (found version "1.65.1") found components: system 
-- Found PythonInterp: /usr/bin/python3 (found suitable version "3.6.9", minimum required is "3") 
-- Found numpy include path: '/home/***/.local/lib/python3.6/site-packages/numpy/core/include'
-- Found numpy/arrayobject.h in /home/***/.local/lib/python3.6/site-packages/numpy/core/include. Keeping it as NUMPY_INCLUDE_DIR.
-- Found Boost: /usr/include (found version "1.65.1") found components: python 
-- Found numpy include path: '/home/***/.local/lib/python3.6/site-packages/numpy/core/include'
-- Found numpy/arrayobject.h in /home/***/.local/lib/python3.6/site-packages/numpy/core/include. Keeping it as NUMPY_INCLUDE_DIR.
-- Marking HEADER FILES in "include" folder of package "numpy_eigen" for installation
-- Configuring done
-- Generating done
-- Build files have been written to: /home/***/catkin_test/build

......
[ 21%] Building CXX object numpy_eigen/CMakeFiles/numpy_eigen_test.dir/src/autogen_test_module/numpy_eigen_test_module.cpp.o
[ 21%] Building CXX object numpy_eigen/CMakeFiles/numpy_eigen_test.dir/src/autogen_test_module/test_float.cpp.o
[ 21%] Building CXX object numpy_eigen/CMakeFiles/numpy_eigen_test.dir/src/autogen_test_module/test_int.cpp.o
[ 28%] Building CXX object numpy_eigen/CMakeFiles/numpy_eigen_test.dir/src/autogen_test_module/test_double.cpp.o
[ 35%] Building CXX object numpy_eigen/CMakeFiles/numpy_eigen_test.dir/src/autogen_test_module/test_uchar.cpp.o
[ 42%] Building CXX object numpy_eigen/CMakeFiles/numpy_eigen_test.dir/src/autogen_test_module/test_long.cpp.o
/home/***/catkin_test/src/numpy_eigen/src/autogen_test_module/test_int.cpp:1:10: fatal error: Eigen/Core: No such file or directory
 #include <Eigen/Core>
          ^~~~~~~~~~~~
In file included from /home/***/catkin_test/src/numpy_eigen/src/autogen_test_module/numpy_eigen_test_module.cpp:2:0:
/home/***/catkin_test/src/numpy_eigen/include/numpy_eigen/boost_python_headers.hpp:23:10: fatal error: Eigen/Core: No such file or directory
 #include <Eigen/Core>
          ^~~~~~~~~~~~
compilation terminated.
numpy_eigen/CMakeFiles/numpy_eigen.dir/build.make:131: recipe for target 'numpy_eigen/CMakeFiles/numpy_eigen.dir/src/autogen_module/import_uchar.cpp.o' failed
make[2]: *** [numpy_eigen/CMakeFiles/numpy_eigen.dir/src/autogen_module/import_uchar.cpp.o] Error 1
CMakeFiles/Makefile2:476: recipe for target 'numpy_eigen/CMakeFiles/numpy_eigen.dir/all' failed
make[1]: *** [numpy_eigen/CMakeFiles/numpy_eigen.dir/all] Error 2
Makefile:145: recipe for target 'all' failed
make: *** [all] Error 2
Invoking "make -j32 -l32" failed

[HannesSommer]

I'm assuming you have eigen_catkin in your workspace (as required here https://github.com/ethz-asl/numpy_eigen/blob/master/package.xml#L13 ), because without it catkin_simple should fail earlier.

Is that assumption correct? It confuses me that catkin_make doesn't seem to "traverse" eigen_catkin as well. That may be normal but could also be a bad side effect of the CATKIN_WHITELIST_PACKAGES. What happens if you whitelist eigen_catkin as well?

If that doesn't fix it, your problem seems to actually indicate a bug in eigen_catkin because it should make this one find the Eigen headers.