CLion - cmake 未定义的引用答案

【问题标题】：CLion - cmake undefined referenceCLion - cmake 未定义的引用
【发布时间】：2016-08-21 09:47:13
【问题描述】：

我想用 CLion 执行一个工作项目。
所以我试图通过 cmake 来模拟 Makefile 但我不是很擅长。我确信错误在 cmake 内部，因为该项目正在使用常规 Makefile。不幸的是，我无法展示有关该项目的大量信息。我希望我将展示的内容足以得到您的帮助。

项目目录结构（不显示文件）如下所示：

.
├── CMakeLists.txt
├── makefile
├── include
│   ├── data
│   ├── io
│   ├── learning
│   ├── metric
│   ├── scoring
│   └── io
└── src
    ├── data
    ├── io
    ├── learning
    ├── metric
    ├── scoring
    ├── utils
    └── main.cc

./CMakeLists.txt

cmake_minimum_required(VERSION 3.3)
project(Project)
set(DCMAKE_CXX_COMPILER "g++-5")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
find_package(Boost 1.57.0 COMPONENTS program_options system filesystem REQUIRED)
find_package(OpenMP)
if (OPENMP_FOUND)
    set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
endif()
include_directories(${Boost_INCLUDE_DIRS})
include_directories("include")
include_directories("src")
add_executable(Project src/main.cc)
target_link_libraries(Project ${Boost_LIBRARIES})

项目编译没有错误，但在链接过程中失败。
部分错误报告如下：

[ 50%] Linking CXX executable Project
CMakeFiles/Project.dir/src/main.cc.o: in function "metric::ir::ir_metric_factory(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, unsigned int)":
./include/metric/metricfactory.h:47: undefined reference to "metric::ir::Dcg::NAME_[abi:cxx11]"
./include/metric/metricfactory.h:49: undefined reference to "metric::ir::Ndcg::NAME_[abi:cxx11]"
./include/metric/metricfactory.h:51: undefined reference to "metric::ir::Tndcg::NAME_[abi:cxx11]"
./include/metric/metricfactory.h:53: undefined reference to "metric::ir::Map::NAME_[abi:cxx11]"
CMakeFiles/Project.dir/src/main.cc.o: in function "main":
./src/main.cc:130: undefined reference to "learning::forests::LambdaMart::NAME_[abi:cxx11]"
./src/main.cc:170: undefined reference to "learning::forests::Mart::NAME_[abi:cxx11]"
./src/main.cc:171: undefined reference to "learning::forests::LambdaMart::NAME_[abi:cxx11]"
./src/main.cc:172: undefined reference to "learning::forests::ObliviousMart::NAME_[abi:cxx11]"
./src/main.cc:173: undefined reference to "learning::forests::ObliviousLambdaMart::NAME_[abi:cxx11]"
./src/main.cc:174: undefined reference to "learning::linear::CoordinateAscent::NAME_[abi:cxx11]"
./src/main.cc:175: undefined reference to "learning::forests::Project::NAME_[abi:cxx11]"
./src/main.cc:176: undefined reference to "learning::CustomLTR::NAME_[abi:cxx11]"
./src/main.cc:181: undefined reference to "metric::ir::Dcg::NAME_[abi:cxx11]"
./src/main.cc:182: undefined reference to "metric::ir::Ndcg::NAME_[abi:cxx11]"
./src/main.cc:183: undefined reference to "metric::ir::Tndcg::NAME_[abi:cxx11]"
./src/main.cc:184: undefined reference to "metric::ir::Map::NAME_[abi:cxx11]"
./src/main.cc:247: undefined reference to "metric::ir::Dcg::NAME_[abi:cxx11]"
./src/main.cc:248: undefined reference to "metric::ir::Ndcg::NAME_[abi:cxx11]"
./src/main.cc:249: undefined reference to "metric::ir::Tndcg::NAME_[abi:cxx11]"
./src/main.cc:250: undefined reference to "metric::ir::Map::NAME_[abi:cxx11]"
./src/main.cc:319: undefined reference to "learning::forests::LambdaMart::NAME_[abi:cxx11]"
./src/main.cc:324: undefined reference to "learning::forests::Mart::NAME_[abi:cxx11]"
./src/main.cc:329: undefined reference to "learning::forests::ObliviousMart::NAME_[abi:cxx11]"
./src/main.cc:334: undefined reference to "learning::forests::ObliviousLambdaMart::NAME_[abi:cxx11]"
./src/main.cc:339: undefined reference to "learning::linear::CoordinateAscent::NAME_[abi:cxx11]"
./src/main.cc:346: undefined reference to "learning::linear::CoordinateAscent::CoordinateAscent(unsigned int, double, double, unsigned int, unsigned int)"
./src/main.cc:347: undefined reference to "learning::forests::Project::NAME_[abi:cxx11]"
./src/main.cc:351: undefined reference to "learning::CustomLTR::NAME_[abi:cxx11]"
./src/main.cc:352: undefined reference to "learning::CustomLTR::CustomLTR()"
( other errors lines )
collect2: error: ld returned 1 exit status
make[2]: *** [Project] Error 1
make[1]: *** [CMakeFiles/Project.dir/all] Error 2
make: *** [all] Error 2

【问题讨论】：

看起来函数 learning:: 命名空间是在 src/learning 下的某个地方实现的，因此您也需要编译这些源代码。其他命名空间类似（例如metric::）。
对不起，我该如何编译它们？可以举个例子吗？
在add_executable() 命令中枚举所有源，在src/main.cc 之后。
但我做了include_directories(src)，这不是一回事吗？是否存在更短的方法来做到这一点？而不是在add_executable() 中插入我所有将近一百个源文件。
你肯定需要一些关于 CMake 的教程。命令include_directories() 不会添加编译源，它会添加搜索头 的目录。命令file(GLOB)可用于收集目录中的源文件。

标签： c++ cmake ld undefined-reference clion

【解决方案1】：

好的，感谢Tsyvarev的帮助，我解决了。
./CMakeLists.txt

cmake_minimum_required(VERSION 3.3)
project(Project)
set(DCMAKE_CXX_COMPILER "g++-5")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
find_package(Boost 1.57.0 COMPONENTS program_options system filesystem REQUIRED)
find_package(OpenMP)
if (OPENMP_FOUND)
    set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
endif()
include_directories(${Boost_INCLUDE_DIRS})
include_directories("include")
file(GLOB_RECURSE SOURCES src/*.cc) #*/
add_executable(Project ${SOURCES})
target_link_libraries(Project ${Boost_LIBRARIES})

我使用file(GLOB_RECURSE SOURCES src/*.cc) 添加源而不是include_directories("src")。

【讨论】：