CMake 链接器错误：对类的未定义引用-解网

问：

我正在尝试使用以下结构构建一个项目：

└── main/
    ├── CMakeLists.txt/
    │   └── src/
    │       └── main.cpp
    └── models/
        └── modelA/
            ├── src/
            │   └── h
            ├── lib
            └── CMakeLists.txt

main/CMakeLists.txt看起来像这样：

cmake_minimum_required(VERSION 3.17.0)
project(fiducial_marker_test)

IF(NOT CMAKE_BUILD_TYPE)
  SET(CMAKE_BUILD_TYPE Release)
ENDIF()

MESSAGE("Build type: " ${CMAKE_BUILD_TYPE})

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}  -Wall -w  ")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -w ")

# Check C++11 or C++0x support
include(CheckCXXCompilerFlag)
CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")

add_subdirectory(${CMAKE_SOURCE_DIR}/models/modelA)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}/app)

add_executable(main ${CMAKE_SOURCE_DIR}/src/main.cpp)

target_include_directories(main PRIVATE ${CMAKE_SOURCE_DIR}/modules/modelA/src/)

target_link_libraries(main PRIVATE modelA)

像这样：main/models/modelA/CMakeLists.txt

cmake_minimum_required(VERSION 3.17.0)
project(libmodelA)

find_package(OpenCV REQUIRED)

set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_SOURCE_DIR}/lib)
file(GLOB SRC_FILE1 "./src*.c*")
file(GLOB SRC_FILE2 "./src/ED/*.c*")

include_directories(
    ${OpenCV_INCLUDE_DIRS}
    ${CMAKE_CURRENT_SOURCE_DIR}/src/
    ${CMAKE_CURRENT_SOURCE_DIR}/src/ED/
)
add_library(
    modelA SHARED
    ${SRC_FILE1}
    ${SRC_FILE2}
)
target_include_directories(modelA INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/src ${CMAKE_CURRENT_SOURCE_DIR}/src/ED)

target_link_libraries(
    modelA
    ${OpenCV_LIBS}
)

当我尝试运行 cmake --build 时。从 main/build 中，它给出以下错误：

[ 92%] Building CXX object CMakeFiles/main.dir/src/main.cpp.o
[100%] Linking CXX executable ../app/main
/usr/bin/ld: CMakeFiles/main.dir/src/main.cpp.o: in function `main':
main.cpp:(.text.startup+0xb9): undefined reference to `ModelA::ModelA(int, int, bool)'
collect2: error: ld returned 1 exit status
gmake[2]: *** [CMakeFiles/main.dir/build.make:113: ../app/main] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:100: CMakeFiles/main.dir/all] Error 2
gmake: *** [Makefile:91: all] Error 2

我已经尝试了不同的方法来解决这个问题，但到目前为止还没有运气。我相信是链接问题吗？我是 cmake 的新手，所以任何提示或见解将不胜感激。

CMake 链接器错误

最后，你可以使你的CMake配置更简洁、更简洁。使用时，大多数情况下，可以与这些包的目标链接。这些目标包含库和标头，因此无需手动仅包含和链接必要的库。如果您与 INTERFACE 或 PUBLIC 一起使用，这同样适用于您自己的库。您可以在使用 OpenCV 的 CMake 模块目标中查看 OpenCV 目标，而不是直接包含所有库？或在 Conan 中心查看其他 libs 目标。这样做，会像这样：find_packagetarget_include_directoriesmain/models/modelA/CMakeLists.txt

cmake_minimum_required(VERSION 3.17.0)
project(libmodelA)

find_package(OpenCV REQUIRED)

set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_SOURCE_DIR}/lib)
file(GLOB SRC_FILE1 "./src*.c*")
file(GLOB SRC_FILE2 "./src/ED/*.c*")

add_library(
    modelA SHARED
    ${SRC_FILE1}
    ${SRC_FILE2}
)
target_include_directories(modelA INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/src ${CMAKE_CURRENT_SOURCE_DIR}/src/ED)

target_link_libraries( modelA PRIVATE opencv_core)

CMake 链接器错误：对类的未定义引用

CMake Linker error : undefined reference to class

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