未定义对功能CMake的引用 [英] Undefined reference to function CMake

问题描述

我正在尝试学习CMake，但是未获得对...链接器错误的引用 我有一个带有子目录的目录. 他们每个人都有自己的CMakeLists.txt

I am trying to learn CMake, but I get a undefined reference to ... linker error I have a directory with a subdirectory. each of them has its own CMakeLists.txt

test
|----main.cpp
|----CMakeLists.txt
|----test2
     |----foo.hpp
     |----foo.cpp
     |----CMakeLists.txt

用于测试的CMakeLists.txt是:

the CMakeLists.txt for test is:

cmake_minimum_required(VERSION 3.5)
project(tests)

add_subdirectory(test2)
set(SOURCE_FILES main.cpp)
add_executable(tests ${SOURCE_FILES})

test2的CMakeLists.txt是:

the CMakeLists.txt for test2 is:

set(test2_files
        foo.cpp
        foo.hpp
        )
add_library(test2 ${test2_files})

foo.cpp实现在foo.hpp中定义的功能 对于此功能，我收到未定义的参考错误. 我究竟做错了什么?如何摆脱链接器错误

foo.cpp implements a function which is defined in foo.hpp for this function I am getting the undefined reference error. What am I doing wrong? How can I get rid of this linker error

我的CMakeLists.txt现在看起来像这样，但是我仍然收到链接器错误:

My CMakeLists.txt now looks like this, but I still get the linker error:

project(tests)

cmake_minimum_required(VERSION 2.8)

set(SOURCE_FILES main.cpp)

include_directories(test2)
link_directories(test2)

add_subdirectory(test)

add_executable( ${PROJECT_NAME} ${SOURCE_FILES} )

target_link_libraries(${PROJECT_NAME} test2)

我也尝试使用绝对路径而不是test2

I also tried it with the absolute path instead of test2

解决了它只是test2的CMakeLists.txt中的一个错字.

solved it it was only a typo in the CMakeLists.txt of test2.

推荐答案

请确保您的测试CMakeLists.txt链接到已创建的库.

Make sure that your test CMakeLists.txt links to the created library.

project(test)

cmake_minimum_required(VERSION 2.8)

set(SOURCE_FILES main.cpp)

include_directories( test2 )

#here
link_directories(test2)

add_subdirectory(test2)

add_executable( ${PROJECT_NAME} ${SOURCE_FILES} )

#and here
target_link_libraries( ${PROJECT_NAME} test2 )

这篇关于未定义对功能CMake的引用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！