c++ - how to link .so files with CMake

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65886495/how-to-link-so-files-with-cmake

Answer 1

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)

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)