无法通过CMake找到Eigen3

Question

我有点绝望:对于我的学习,我需要与Eigen和CMake合作.我能够使用Eigen,如果我将整个库复制到我的编译器默认查找的目录中,但是一旦我尝试通过它找到它
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!

现在我搜索了解决方案,但我尝试过的所有(也是stackoverflow上的那些:
查找包Eigen3 for CMake 或 CMake找不到Eigen3)都不起作用.我的Eigen版本(根据Macros Core/util/Macros.h)是3.2.5.我保留了Eigen目录/usr/local/include,我使用FindEigen3.cmake了Eigen库附带的内容,我的CMakeLists.txt外观如下:

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)

有谁知道出了什么问题？

亲切的问候,朱利安

Answer 1

将我的评论转化为答案

find包脚本 - FindEigen3.cmake通常使用该find_path()命令来检测包的include目录(有关完整详细信息,请参阅其文档).

FindEigen3.cmake 使用以下代码段:

find_path(EIGEN3_INCLUDE_DIR NAMES signature_of_eigen3_matrix_library
    PATHS
    ${CMAKE_INSTALL_PREFIX}/include
    ${KDE4_INCLUDE_DIR}
    PATH_SUFFIXES eigen3 eigen
)

所以它默认CMAKE_INSTALL_PREFIX在Unix/Linux主机上查找/usr/local.

以下对我有用:

• 转到Eigen源目录并运行CMake和安装步骤

  > mkdir build
  > cd build
  > cmake ..
  > make install
  

• 然后将 - 如您所做的那样 - 复制FindEigen3.cmake到项目源目录中.

• 现在你的代码确实找到了Eigen(只是改为list(APPEND ...))

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

参考

• Eigen&CMake
• CMake:如果你需要指定CMAKE_MODULE_PATH,find_package()的用途是什么？
• Cmake找不到Boost