在我的Cmake项目中使用Eigen Lib？ [英] Using Eigen Lib in my Cmake project?

问题描述

我在CMake项目中使用仅标头库（Eigen）时遇到困难。当我摘下所有与Eigen库相关的部分时，它将进行编译，但不确定如何使用（Eigen）进行构建。请注意，Eigen在Eigen文件夹中有一个CmakeLists.txt，并且它的/ src文件夹中有（* .h和* .cpp）与Matrix操作等有关。

I am having difficulty using a header-only library (Eigen) in my CMake project. When i take off all the portion related to Eigen library it compiles, but not sure how to build with (Eigen). Note that Eigen has a CmakeLists.txt in Eigen folder, and it has /src folder having (*.h and *.cpp) related to Matrix operation etc...

我的程序结构如下

Myproject（文件夹）由以下组成：

Myproject (folder) is composed of :

• CmakeLists.txt


• / Build


• / Source

源文件夹中有一堆我的文件（* .h和* .cpp）和/ Eigen（文件夹）。

The Source folder has bunch of my files (*.h and *.cpp) and the /Eigen (folder).

我所做的是：

FIND_PACKAGE(PkgConfig REQUIRED)
PKG_CHECK_MODULES(GTK3 REQUIRED gtk+-3.0)
LIST(APPEND CMAKE_CXX_FLAGS 
    "-std=c++0x
     -pthread 
     ${CMAKE_CXX_FLAGS} 
     -g 
    -Wall -Wextra ")

ADD_LIBRARY(Eigen ${CMAKE_SOURCE_DIR}/Eigen)
TARGET_INCLUDE_DIRECTORIES(Eigen INTERFACE
 $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>
 $<INSTALL_INTERFACE:include/Eigen>
)

INCLUDE_DIRECTORIES(${GTK3_INCLUDE_DIRS})
ADD_DEFINITIONS(${GTK3_CFLAGS_OTHERS})
INCLUDE_DIRECTORIES(include)
ADD_LIBRARY(RTT 
        Def.cpp 
        Def.h       
        krnel.cpp 
        krnel.h 
        Mesh.cpp 
        Mesh.h 
        Mcom.cpp 
        Mcom.h 
        timer.h 
        Identifier.h)       

ADD_EXECUTABLE(Rdrtst main.cpp)
TARGET_LINK_LIBRARIES(Rdrtst RTT ${GTK3_LIBRARIES} Eigen)

当我cd到/ Build并键入（Cmake ../Source）

When i cd to /Build and type (Cmake ../Source )

我得到以下信息：

[/../Build]$ cmake ../Source
-- Configuring done
CMake Error: Cannot determine link language for target "Eigen".
CMake Error: CMake can not determine linker language for target:Eigen
-- Generating done
-- Build files have been written to: /../../MyProject/Build

本征文件夹包含CMakeLists.txt，其内容如下：

The eigen folder has the CMakeLists.txt with the following content :

include(RegexUtils)
test_escape_string_as_regex()

file(GLOB Eigen_directory_files "*")

escape_string_as_regex(ESCAPED_CMAKE_CURRENT_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}")

foreach(f ${Eigen_directory_files})
  if(NOT f MATCHES "\\.txt" AND NOT f MATCHES "${ESCAPED_CMAKE_CURRENT_SOURCE_DIR}/[.].+" AND NOT f MATCHES "${ESCAPED_CMAKE_CURRENT_SOURCE_DIR}/src")
    list(APPEND Eigen_directory_files_to_install ${f})
  endif()
endforeach(f ${Eigen_directory_files})

install(FILES
  ${Eigen_directory_files_to_install}
  DESTINATION ${INCLUDE_INSTALL_DIR}/Eigen COMPONENT Devel
  )

add_subdirectory(src)

推荐答案

您只需要INCLUDE_DIRECTORIES中正确的路径即可（还请确保包含正确的路径文件夹或子文件夹，具体取决于您的c ++文件中使用的是#include Eigen / something.h还是#include something.h）
因此，请删除ADD_LIBRARY（Eigen ...和TARGET_LINK_LIBRARIES Eigen）行。

You just need the correct path in INCLUDE_DIRECTORIES (also make sure to include the correct folder or subfolder, depending if in your c++ file you are using #include Eigen/something.h or #include something.h ) So, remove the lines ADD_LIBRARY(Eigen ... and TARGET_LINK_LIBRARIES Eigen.

要进行故障排除，您还可以包含Eigen文件夹的绝对路径，然后在其正常工作时，将其转换为相对路径

For troubleshooting, you can also include the absolute path of the Eigen folder , and then when you get it working, transform it in a relative path

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