（Cmake）对〜的未定义引用（Cmake无法链接我的项目）

Question

我正在使用Google测试进行C ++项目。但是，在对其他.cpp文件进行了一些处理之后，cmake将无法再链接我的项目。 它似乎适用于test.cpp和test.h，但不适用于我添加的新cpp文件（位于Backend / util下），即使它们位于子目录中（我也将它们添加到add_library中）

我已经解决这个问题好几天了，但是无法解决。 我很高兴收到您的评论。

-我的项目目录结构-

-包含文件夹-

-来源文件夹-

-测试文件夹-

-CMake / CompileOptions.cmake

# Install script for directory: /home/jwkim/projects/CubbyDNN

# Set the install prefix
if(NOT DEFINED CMAKE_INSTALL_PREFIX)
  set(CMAKE_INSTALL_PREFIX "/usr/local")
endif()
string(REGEX REPLACE "/$" "" CMAKE_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")

# Set the install configuration name.
if(NOT DEFINED CMAKE_INSTALL_CONFIG_NAME)
  if(BUILD_TYPE)
    string(REGEX REPLACE "^[^A-Za-z0-9_]+" ""
           CMAKE_INSTALL_CONFIG_NAME "${BUILD_TYPE}")
  else()
    set(CMAKE_INSTALL_CONFIG_NAME "Debug")
  endif()
  message(STATUS "Install configuration: \"${CMAKE_INSTALL_CONFIG_NAME}\"")
endif()

# Set the component getting installed.
if(NOT CMAKE_INSTALL_COMPONENT)
  if(COMPONENT)
    message(STATUS "Install component: \"${COMPONENT}\"")
    set(CMAKE_INSTALL_COMPONENT "${COMPONENT}")
  else()
    set(CMAKE_INSTALL_COMPONENT)
  endif()
endif()

# Install shared libraries without execute permission?
if(NOT DEFINED CMAKE_INSTALL_SO_NO_EXE)
  set(CMAKE_INSTALL_SO_NO_EXE "1")
endif()

# Is this installation the result of a crosscompile?
if(NOT DEFINED CMAKE_CROSSCOMPILING)
  set(CMAKE_CROSSCOMPILING "FALSE")
endif()

if(NOT CMAKE_INSTALL_LOCAL_ONLY)
  # Include the install script for each subdirectory.
  include("/home/jwkim/projects/CubbyDNN/cmake-build-debug/Libraries/googlebenchmark/cmake_install.cmake")
  include("/home/jwkim/projects/CubbyDNN/cmake-build-debug/Sources/cubbydnn/cmake_install.cmake")
  include("/home/jwkim/projects/CubbyDNN/cmake-build-debug/Tests/UnitTests/cmake_install.cmake")

endif()

if(CMAKE_INSTALL_COMPONENT)
  set(CMAKE_INSTALL_MANIFEST "install_manifest_${CMAKE_INSTALL_COMPONENT}.txt")
else()
  set(CMAKE_INSTALL_MANIFEST "install_manifest.txt")
endif()

string(REPLACE ";" "\n" CMAKE_INSTALL_MANIFEST_CONTENT
       "${CMAKE_INSTALL_MANIFEST_FILES}")
file(WRITE "/home/jwkim/projects/CubbyDNN/cmake-build-debug/${CMAKE_INSTALL_MANIFEST}"
     "${CMAKE_INSTALL_MANIFEST_CONTENT}")

Tests / UnitTests.cmakeLists.txt

# Target name
set(target UnitTests)

# Includes
include_directories(${CMAKE_CURRENT_SOURCE_DIR})

# Sources
file(GLOB sources
    ${CMAKE_CURRENT_SOURCE_DIR}/*.cpp)

# Build executable
add_executable(${target}
    ${sources})

# Project options{
set_target_properties(${target}
    PROPERTIES
    ${DEFAULT_PROJECT_OPTIONS}
)

# Compile options
# GCC and Clang compiler options
if(CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
    set(DEFAULT_COMPILE_OPTIONS ${DEFAULT_COMPILE_OPTIONS}
        # /wd4996       # -> disable warning: non-Standard std::tr1 namespace and TR1-only machinery (because of gtest)     
        -Wno-unused-variable
        )
endif()
target_compile_options(${target}
    PRIVATE
    ${DEFAULT_COMPILE_OPTIONS}
)
target_compile_definitions(${target}
    PRIVATE
)

# Link libraries
target_link_libraries(${target}
    PRIVATE
    ${DEFAULT_LINKER_OPTIONS}
    CubbyDNN
    gtest)

-Sources / cubbydnn / cmakeLists.txt

# Target name
set(target CubbyDNN)

# Define
set(root_dir ${CMAKE_CURRENT_SOURCE_DIR}/../..)

# Includes
include_directories(
        ${CMAKE_CURRENT_SOURCE_DIR}
        ${CMAKE_CURRENT_SOURCE_DIR}/../../Libraries
)

#Added by Justin
include_directories(
        ${CMAKE_CURRENT_SOURCE_DIR}/../../Includes
)

# Sources
file(GLOB header_dir
        ${root_dir}/Includes)

file(GLOB_RECURSE headers
        ${header_dir}/*.h)

file(GLOB_RECURSE sources
        ${CMAKE_CURRENT_SOURCE_DIR}/*.cpp Backend/storage/Tensor_object.cpp Backend/storage/baseOp.cpp Backend/storage/storage.cpp)

# Build library
add_library(${target}
        ${sources} Backend/util/management.cpp Backend/util/baseOp.cpp Backend/util/Tensor_container.cpp)

# Project options
set_target_properties(${target}
        PROPERTIES
        ${DEFAULT_PROJECT_OPTIONS}
        )

# Compile options
target_compile_options(${target}
        PRIVATE

        PUBLIC
        ${DEFAULT_COMPILE_OPTIONS}

        INTERFACE
        )

target_link_libraries(${target}
        PRIVATE

        PUBLIC
        ${DEFAULT_LINKER_OPTIONS}
        ${DEFAULT_LIBRARIES}

        INTERFACE
        )

# Install
install(TARGETS ${target} DESTINATION lib)
install(DIRECTORY ${header_dir} DESTINATION include)

最后，这是我的simpleTest.cpp文件，它执行Google测试

#include <gtest/gtest.h>
#include "../../../../Includes/cubbydnn/Backend/util/management.hpp"
#include "../../../../Includes/cubbydnn/Backend/util/exceptions.hpp"
#include "../../../../Includes/cubbydnn/Backend/util/baseOp.hpp"
#include "../../../../Includes/cubbydnn/Backend/util/Tensor_container.hpp"

#include <Test.h>

using namespace cubby_dnn;
TEST(SimpleTest, Add) {
    EXPECT_EQ(5, Add(2, 3));
    std::cout<<"called Test"<<std::endl;
    emptyOp<int> empty = emptyOp<int>();
    empty.print();
}

我在Includes / cubbydnn / Backend / util / baseOp.hpp中声明了emptyOp 并在Sources / cubbydnn / Backend / util / baseOp.cpp

中定义了其方法

编译器抱怨（实际上是链接器）

/home/jwkim/clion-2018.2.5/bin/cmake/linux/bin/cmake --build /home/jwkim/projects/CubbyDNN/cmake-build-debug --target gtest -- -j 4
[100%] Built target gtest

Build finished

/home/jwkim/clion-2018.2.5/bin/cmake/linux/bin/cmake --build     /home/jwkim/clion-2018.2.5/bin/cmake/linux/bin/cmake --build /home/jwkim/projects/CubbyDNN/cmake-build-debug --target gtest -- -j 4
[100%] Built target gtest

Build finished

/home/jwkim/clion-2018.2.5/bin/cmake/linux/bin/cmake --build /home/jwkim/projects/CubbyDNN/cmake-build-debug --target UnitTests -- -j 4
[ 20%] Built target gtest
[ 70%] Built target CubbyDNN
[ 80%] Linking CXX executable ../../bin/UnitTests
CMakeFiles/UnitTests.dir/SimpleTest.cpp.o: In function `SimpleTest_Add_Test::TestBody()':
/home/jwkim/projects/CubbyDNN/Tests/UnitTests/SimpleTest.cpp:13: undefined reference to `cubby_dnn::emptyOp<int>::emptyOp()'
/home/jwkim/projects/CubbyDNN/Tests/UnitTests/SimpleTest.cpp:14: undefined reference to `cubby_dnn::emptyOp<int>::print()'
collect2: error: ld returned 1 exit status
Tests/UnitTests/CMakeFiles/UnitTests.dir/build.make:100: recipe for target 'bin/UnitTests' failed
make[3]: *** [bin/UnitTests] Error 1
CMakeFiles/Makefile2:360: recipe for target 'Tests/UnitTests/CMakeFiles/UnitTests.dir/all' failed
make[2]: *** [Tests/UnitTests/CMakeFiles/UnitTests.dir/all] Error 2
CMakeFiles/Makefile2:372: recipe for target 'Tests/UnitTests/CMakeFiles/UnitTests.dir/rule' failed
make[1]: *** [Tests/UnitTests/CMakeFiles/UnitTests.dir/rule] Error 2
Makefile:229: recipe for target 'UnitTests' failed
make: *** [UnitTests] Error 2/home/jwkim/projects/CubbyDNN/cmake-build-debug --target UnitTests -- -j 4
[ 20%] Built target gtest
[ 70%] Built target CubbyDNN
[ 80%] Linking CXX executable ../../bin/UnitTests
CMakeFiles/UnitTests.dir/SimpleTest.cpp.o: In function `SimpleTest_Add_Test::TestBody()':
/home/jwkim/projects/CubbyDNN/Tests/UnitTests/SimpleTest.cpp:13: undefined reference to `cubby_dnn::emptyOp<int>::emptyOp()'
/home/jwkim/projects/CubbyDNN/Tests/UnitTests/SimpleTest.cpp:14: undefined reference to `cubby_dnn::emptyOp<int>::print()'
collect2: error: ld returned 1 exit status
Tests/UnitTests/CMakeFiles/UnitTests.dir/build.make:100: recipe for target 'bin/UnitTests' failed
make[3]: *** [bin/UnitTests] Error 1
CMakeFiles/Makefile2:360: recipe for target 'Tests/UnitTests/CMakeFiles/UnitTests.dir/all' failed
make[2]: *** [Tests/UnitTests/CMakeFiles/UnitTests.dir/all] Error 2
CMakeFiles/Makefile2:372: recipe for target 'Tests/UnitTests/CMakeFiles/UnitTests.dir/rule' failed
make[1]: *** [Tests/UnitTests/CMakeFiles/UnitTests.dir/rule] Error 2
Makefile:229: recipe for target 'UnitTests' failed
make: *** [UnitTests] Error 2

这是一篇很长的文章..但是我很高兴听到您的任何帮助..并随时询问我任何进一步的信息