Configuration tips for building Linux multi-threaded applications using CMake

Configuration tips for building Linux multi-threaded applications using CMake

Developing multi-threaded applications on the Linux platform is a common task. CMake is a powerful build tool that simplifies the project building process. This article will introduce how to configure and build multi-threaded applications using CMake, and give some code examples.

First, make sure CMake is installed. Enter the following command in the terminal to check whether CMake is installed:

cmake --version

If CMake is already installed, its version information will be displayed. If it is not installed, install CMake according to your Linux distribution.

Next, we will create a simple multi-threaded application to illustrate how to use CMake for configuration.

First, create a file named "main.cpp" and write the following code in it:

#include <iostream>
#include <thread>

void threadFunction()
{
    std::cout << "This is a thread." << std::endl;
}

int main()
{
    std::thread t(threadFunction);
    t.join();

    std::cout << "This is the main thread." << std::endl;

    return 0;
}

In this example, we define a file named threadFunction function and output a message in it. In the main function, we create a new thread and then use the join function to wait for the thread to complete. Finally, we output a message to represent the main thread.

Next, we create a file called "CMakeLists.txt" and write the following content in it:

cmake_minimum_required(VERSION 3.12)
project(Threads)
set(CMAKE_CXX_STANDARD 14)

find_package(Threads REQUIRED)

add_executable(Threads main.cpp)
target_link_libraries(Threads PRIVATE Threads::Threads)

In this example's CMakeLists.txt file, we first specify Minimum version requirements for CMake. Then, we set the version of the C standard to C 14.

Next, we use the find_package command to find the Threads library. This library is part of the C standard library and contains multi-threading related functions. We tell CMake that this is required via the REQUIRED keyword.

Then, we use the add_executable command to specify the name and source file of the executable file to be generated. In this example, we will generate an executable file named "Threads" and use "main.cpp" as the source file.

Finally, we use the target_link_libraries command to link the Threads library to our executable file.

Now we can build our application using the following commands:

mkdir build
cd build
cmake ..
make

These commands will generate the project files in the "build" directory and build the executable file.

Once completed, we can run our application:

./Threads

You will see output similar to the following:

This is a thread.
This is the main thread.

At this point, we successfully configured and built using CMake Created a simple multi-threaded application.

To summarize, using CMake to configure and build Linux multi-threaded applications is relatively simple and convenient. You can specify dependencies and link libraries by writing a CMakeLists.txt file, and use the corresponding commands to generate an executable file. The powerful CMake tool can greatly simplify the project building process.

I hope the sample code and instructions in this article can help you better understand how to use CMake to build multi-threaded applications. I wish you success in Linux development!

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