找不到具有CMake的Eigen3

Question

我有点绝望:为了我的学习，我需要和Eigen和CMake一起工作。如果我将整个库复制到编译器默认查找的目录中，那么我就可以使用Eigen

find_package(Eigen3 REQUIRED)

我得到以下错误：

CMake Error at /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:148 (message):
  Could NOT find Eigen3 (missing: EIGEN3_INCLUDE_DIR EIGEN3_VERSION_OK)
  (Required is at least version "2.91.0")
Call Stack (most recent call first):
  /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:388 (_FPHSA_FAILURE_MESSAGE)
  FindEigen3.cmake:76 (find_package_handle_standard_args)
  CMakeLists.txt:8 (find_package)

-- Configuring incomplete, errors occurred!



Now I searched for solutions but all I those I tried (also those available on stackoverflow: 

Find package Eigen3 for CMake 
or 
CMake Can't find Eigen3 )
did not work.
My Eigen Version (according to the Macros in Core/util/Macros.h) is 3.2.5.
I keep the Eigen directory in /usr/local/include, I use the FindEigen3.cmake which comes with the Eigen library and my CMakeLists.txt looks as follows: 



cmake_minimum_required(VERSION 2.8)
project(Test)

set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR})
find_package(Eigen3 REQUIRED)
include_directories(${EIGEN3_INCLUDE_DIR})
message("Found Eigen3 in: ${EIGEN3_INCLUDE_DIR}")

add_executable(main test.cpp)


Has anyone an idea what's going wrong?

Kind regards,
Julien

Answer 1

将我的评论转化为答案

查找包脚本通常使用find_path()命令来检测包的包含目录(有关完整的详细信息，请参见it's documentation )。

FindEigen3.cmake使用以下代码片段：

find_path(EIGEN3_INCLUDE_DIR命名signature_of_eigen3_matrix_library路径${CMAKE_INSTALL_PREFIX}/include ${KDE4_INCLUDE_DIR} PATH_SUFFIXES eigen3特征)

因此，它在Unix/Linux主机上缺省为/usr/local的CMAKE_INSTALL_PREFIX中查找。

下面的方法对我很有效：

• 转到Eigen源目录，然后运行CMake和安装步骤mkdir build > cd build > cmake ..> make install

然后，

• 将FindEigen3.cmake复制到项目源目录。
• 现在您的代码可以找到Eigen (只是更改为list(APPEND ...))

list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}") find_package(需要Eigen3)

参考

• Eigen & CMake
• CMake: Of what use is find_package() if you need to specify CMAKE_MODULE_PATH anyway?
• Cmake doesn't find Boost

Answer 2

在find_package(Eigen3 REQUIRED)前添加FindEigen3.cmake的路径，如下所示：

LIST(APPEND CMAKE_MODULE_PATH "/usr/share/cmake-2.8/Modules/")
find_package(Eigen3)