Each target represents an executable, library, or some other output of the build pipeline. This script is responsible for defining targets. The CMakeLists.txt script is executed during the configure step. No matter how you run it, it performs two steps: the configure step and the generate step. The Configure and Generate StepsĪs you’ll see in the following sections, there are several ways to run CMake. Instead, simply re-run CMake each time you clone the project to a new folder. You aren’t meant to submit the generated build pipeline to source control, as it usually contains paths that are hardcoded to the local filesystem. (You can, and will, re-run CMake several times on the same binary folder.) Cache variables include user-configurable options defined by the project such as CMakeDemo’s DEMO_ENABLE_MULTISAMPLE option (explained later), and precomputed information to help speed up CMake runs. This is where cache variables are stored. It’s a single text file in the binary folder named CMakeCache.txt. You can even create several binary folders, side-by-side, that use different build systems or configuration options. A common practice is to create a subdirectory build beneath CMakeLists.txt.īy keeping the binary folder separate from the source, you can delete the binary folder at any time to get back to a clean slate. You can create the binary folder anywhere you want. The binary folder is where CMake generates the build pipeline. The source folder is the one containing CMakeLists.txt. To generate a build pipeline, CMake needs to know the source and binary folders. A build pipeline might be a Visual Studio. The Source and Binary FoldersĬMake generates build pipelines. You can also install it through MacPorts, Homebrew, Cygwin or MSYS2. In Unix-like environments, including Linux, it’s usually available through the system package manager. If you don’t have CMake yet, there are installers and binary distributions on the CMake website. However, I recommend reading the first two sections first. Executables and windows dll files go into bin directory, libraries go into lib directory, and public headers go into include directory at the destination.The information here applies to any CMake-based project, so feel free to skip ahead to any section. Install(TARGETS): to install compiled libraries and their headers in the assigned install directory you set when running cmake -install blah blah. So first compile geo then link it to app executable. Target_link_libraries(): to tell CMake that app is dependent on geo library. Target_include_directories(): is for making source files aware of the location of private headers relative to the project directory. SHARED means a shared library, you can also make a static library with STATIC keyword, or an object file with OBJECT keyword. dll.Īdd_library(): to define a library target, geo. If (MSVC): checking CMake is employing MS Visual C++.ĬMAKE_WINDOWS_EXPORT_ALL_SYMBOLS: This is necessary for MSVC to create a symbol file. To build an example, go to its directory in a terminal and runĬmake_minimum_required ( VERSION 3.23 ) project ( geometry LANGUAGES CXX ) if ( MSVC ) set ( CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON ) endif () add_library ( geo SHARED ) target_include_directories ( geo PRIVATE "$" ) add_subdirectory ( "shape" ) add_subdirectory ( "square" ) add_executable ( app ) target_sources ( app PRIVATE "example/app.cpp" ) target_link_libraries ( app PRIVATE geo ) install ( TARGETS geo FILE_SET HEADERS ) you have a compiler like GCC, Clang, Intel, or MS Visual C++ installed on your operating system.Įxamples are on GitHub here and their links are mentioned in each section as well.you had a look at my post on CMake programming,.In this post, instead of throwing instructions for some random commands, I aim to explain how to employ modern CMake step by step to build executables (applications) and static/shared/header-only libraries from C++ projects. It has comprehensive but daunting manual instruction. It compiles projects with compilers like GCC, Clang, Intel, MS Visual C++.ĬMake is frequently used in compiling open-source and commercial projects. CMake utilizes build-systems such as Ninja, Linux make, Visual Studio, and Xcode. CMake is a cross-platform software for building projects written in C, C++, Fortran, CUDA and so on.
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