在我的 Cmake 项目中使用 Eigen Lib?

问题描述

我在我的 CMake 项目中使用仅标头库 (Eigen) 时遇到困难.当我删除与 Eigen 库相关的所有部分时，它会编译，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，它有/src 文件夹，其中包含与矩阵运算等相关的(*.h 和 *.cpp)...

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:

Myproject (folder) is composed of :

• CmakeLists.txt
• /构建
• /来源

Source 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 并输入 (Cmake ../Source )

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

我得到以下内容:

[/../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

eigen 文件夹中有 CMakeLists.txt ，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 中的正确路径(还要确保包含正确的文件夹或子文件夹，具体取决于您在 C++ 文件中是否使用 #include Eigen/something.h 或 #include something.h )因此，删除行 ADD_LIBRARY(Eigen ... 和 TARGET_LINK_LIBRARIES Eigen.

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.

为了排除故障，您还可以包含 Eigen 文件夹的绝对路径，然后当您运行时，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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