如何将.so文件与CMake链接 [英] how to link .so files with CMake

问题描述

我想基于.cpp，.h和多个.so文件重建一个简单的应用程序.从我所看到的，我的CMakeLists.txt应该是这样的:

I want to rebuild a simple application based on a .cpp, a .h and multiple .so files. From what i've seen, my CMakeLists.txt should be like this :

cmake_minimum_required(VERSION 3.5)    
set(CMAKE_CXX_STANDARD 11)      
project(test C CXX)

add_executable(${PROJECT_NAME} main.cpp)

target_include_directories(${PROJECT_NAME} PUBLIC ${CMAKE_SOURCE_DIR}/lib)     
target_link_libraries(test ${CMAKE_SOURCE_DIR}/libA.so ${CMAKE_SOURCE_DIR}/libB.so) 

所有文件都在同一文件夹中.之前，我已将.cpp与.h文件正确链接. cmake.没有给我任何错误，但是使用 make 后，我得到了:

All files are in the same folder. I previously linked my .cpp with my .h file correctly. cmake . is giving me no error, but after using make i get :

main.cpp:(.text+0xf2d) : undefined reference to « pthread_create »

哪个函数不属于我的.h文件，因此它应该位于.so文件中.我不知道问题是否来自链接或文件.so本身.

Which is a function that doesn't belong to my .h file so it should be in the .so file. I don't know if the issue comes from the link or the file .so itself.

我也有同名的文件，例如libA.so，libA.so.0或libA.so.0.2，我应该在可执行文件中包含所有这些文件吗?

I also have file with the same name like libA.so, libA.so.0 or libA.so.0.2, should i include all of these files in my executable ?

推荐答案

该错误消息表示您必须将 pthread 添加到链接库的列表中.在 target_link_libraries 中，您仅列出没有路径， lib 前缀和文件扩展名的库名称:

The error message means that you have to add pthread to the list of linked libraries. In target_link_libraries you only list the library names without path, lib prefix and file extension:

cmake_minimum_required(VERSION 3.5)    
set(CMAKE_CXX_STANDARD 11)      
project(test C CXX)

find_package(Threads REQUIRED)

add_executable(${PROJECT_NAME} main.cpp)

target_include_directories(${PROJECT_NAME} PUBLIC ${CMAKE_SOURCE_DIR}/lib)     
target_link_libraries(test A B Threads::Threads)

您可以使用 target_link_directories 添加路径a>:

You can add paths with target_link_directories:

cmake_minimum_required(VERSION 3.5)    
set(CMAKE_CXX_STANDARD 11)      
project(test C CXX)

find_package(ThreadsREQUIRED)

add_executable(${PROJECT_NAME} main.cpp)

target_include_directories(${PROJECT_NAME} PUBLIC ${CMAKE_SOURCE_DIR}/lib)     
target_link_directories(test PRIVATE ${CMAKE_SOURCE_DIR})
target_link_libraries(test PRIVATE A B Threads::Threads)

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