CMake发现本征不正确的结果 [英] CMake find eigen incorrect results

问题描述

我正在尝试使用CMake使用 Eigen 编译代码段，但是CMake似乎很难找到正确的路径，即使源代码在那里.

I am trying to compile a code snippet with Eigen using CMake, but CMake seems to have trouble finding the correct path, even if the source code is there.

这是我的 CMakeLists.txt 文件.

cmake_minimum_required(VERSION 3.14.2)
project(test)

# set default build type
if(NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE Release)
endif()


find_package(OpenCV 3 REQUIRED)
find_package (Eigen3 3.3 REQUIRED NO_MODULE)

include_directories(
        include
        ${OpenCV_INCLUDE_DIRS}
        ${EIGEN3_INCLUDE_DIR}
)


add_executable(playground playground.cpp)
target_link_libraries(playground ${OpenCV_LIBS} Eigen3::Eigen)

这是我在 playground.cpp 中导入标头的方式:

This is how I import headers in playground.cpp:

#include <iostream>
#include <vector>
#include <map>
#include <math.h>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <string>
#include <Eigen>

我的 Eigen 安装在/usr/include/eigen3 下，这是目录结构:

My Eigen is installed under /usr/include/eigen3, here is the directory structure:

yuqiong@yuqiong-G7-7588:/usr/include/eigen3$ ls
Eigen  signature_of_eigen3_matrix_library  unsupported

因此，本征库的正确路径是/usr/include/eigen3/Eigen .

So the correct path to Eigen library is /usr/include/eigen3/Eigen.

但是，当我运行上述 CMakeLists.txt 文件的 cmake .. 然后 make 时，使用 -LH标志，CMake抱怨找不到 igen .这是它认为 Eigen 所在位置的路径:

However, when I run cmake .. and then make for the aforementioned CMakeLists.txt file, with the -LH flag, CMake complains it can't find Eigen. This is the path it thinks where Eigen is:

yuqiong@yuqiong-G7-7588:/media/yuqiong/DATA/vignetting/catkin_ws/src/vig2/src/build$ cmake -LH ..
-- Configuring done
-- Generating done
-- Build files have been written to: /media/yuqiong/DATA/vignetting/catkin_ws/src/vig2/src/build
-- Cache values
// Choose the type of build, options are: None Debug Release RelWithDebInfo MinSizeRel ...
CMAKE_BUILD_TYPE:STRING=

// Install path prefix, prepended onto install directories.
CMAKE_INSTALL_PREFIX:PATH=/usr/local

// The directory containing a CMake configuration file for Eigen3.
Eigen3_DIR:PATH=/usr/local/share/eigen3/cmake

// The directory containing a CMake configuration file for OpenCV.
OpenCV_DIR:PATH=/opt/ros/kinetic/share/OpenCV-3.3.1-dev

这是它认为Eigen所在的文件夹的结构:

This is the structure of the folder where it think Eigen is:

yuqiong@yuqiong-G7-7588:/usr/local/share/eigen3$ tree
.
└── cmake
    ├── Eigen3Config.cmake
    ├── Eigen3ConfigVersion.cmake
    ├── Eigen3Targets.cmake
    └── UseEigen3.cmake

我很困惑，为什么CMake会有这种行为?在这种情况下，我如何让它找到 Eigen 的正确路径?

I am confused why CMake has such behavior? How can I let it find the correct path of Eigen in this case?

所有这些环境设置都很难使它正确...

All this environment set-ups are so tricky to get it right...

推荐答案

感谢上面的评论.我认为问题可能出在 Eigen 团队在不同版本之间以某种方式更改了目录结构，而旧的include路径不再起作用.

Thanks for the comments above. I think the issue might be the Eigen team changed their directory structure somehow between different versions, and the old include path does not work anymore.

对我来说，解决方案是将 #include< Eigen/Dense> 更改为 #include< eigen3/Eigen/Dense> .之后， g ++ 和 CMake 可以找到路径.

The solution for me was to change #include <Eigen/Dense> to #include <eigen3/Eigen/Dense>. After that g++ and CMake can find the path.

我确实按照此官方文档安装了 Eigen .，这就是为什么令我惊讶的是安装仍然存在问题的原因.

I did install Eigen following this official doc, which was why I was surprised the installation is still problematic.

此答案解决了我的问题.

This answer solved my problem.

此答案也解决了该问题.

This answer also solves the problem.

另一方面，我的CMake文件有些混乱，包含了 include_directories 和 target_link_libraries .

On another note, my CMake file was a bit messed up, with both include_directories and target_link_libraries.

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