The CMakeLists.txt file has a very long list of possibilities, but there are a few things that every CMakeLists.txt file needs to have. Here, you’ll define the name of your application, what files are included, if any libraries are needed, and more. This file defines everything related to your use of CMake. To begin, you need to create the file CMakeLists.txt in the root directory of your application. Now that you’ve created the sample application, it’s time to add CMake to the project. If you do run into any issues, please check that your compiler is the latest version and that you’ve correctly copied the code. The previous command should be able to run without any issues. For the rest of this tutorial, your OS should be irrelevant. Note: It’s assumed that you’re using Linux and, by extension, GCC (the GNU Compiler Collection) for this part however, please compile for your specific OS. In here, you want to create a folder called src, in which you create two files: main.cpp and add.cpp. Start off by creating an empty directory and then enter it. For this tutorial, you’re going to build a very simple two-file application that can add two numbers together. Since CMake is a tool that’s meant to aid you in building your applications, you need to have an application to begin with.
If you want to clone the project and follow along in your own editor, here is the link to the GitHub repo. Once the basic use case has been covered, you’ll also be introduced to how you can take CMake implementations to the next level.
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In this tutorial, you’ll be giving an overview of how to use CMake in general, using a simple C++ application as an example. Instead, CMake provides a way for developers to configure a build pipeline easily, as well as make sure it works cross-platform. It’s very important to note that CMake does not build any applications that’s a job for the compiler. There are other options to use for building applications, including autoconf and BJam however, as mentioned before, CMake helps build applications- help being the keyword. Especially in the C++ community, the standard is to use CMake when building your applications. However, with languages that have been around as long as C and C++, the community has converged around some de facto standards. When it comes to packaging an application, there are many ways to do it.
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