![]() ![]() ![]() This structure offers you the ability to turn on/off whole sections of the build tree easily, but more importantly it gives each subdirectory its own variable scope. answer gives a good example of how this can be useful, so I won't repeat most of those details here. Once a project becomes non-trivial in size, most choose to add a CMakeLists.txt file in each subdirectory and use add_subdirectory() to bring them all together. This is especially true if you both add/remove a file, thereby both change the top level CMakeLists.txt file and have the possibility of a conflict. That may not seem like a big deal, but if multiple people are working on a project and you want to easily see what part of a project someone else's changes affect (e.g. It also has the disadvantage that a change for a file addition or removal isn't restricted to a particular directory. Once the project grows, keeping everything in the top level can become too much and make the resultant CMakeLists.txt file harder to follow. Having just one top level CMakeLists.txt file would only be recommended if there were very few files and subdirectories. Not the recommended approach in general though.Įach has its pros and cons. This method is less common, but can have advantages over the other two in some circumstances. The top level CMakeLists.txt file brings in the subdirectory files with include(). One CMakeLists.txt file at the top level, each subdirectory having its own file that lists its own source files and targets.This approach is very common and is usually the recommended one. One CMakeLists.txt file in each directory, each one brought in by its parent using add_subdirectory().You typically only see this for very simple projects. One CMakeLists.txt file at the top level which lists all the source files out in all the different subdirectories.The source code of this sample project canbe found at CMakeLists.txt and test.I'll refer you to this article for an in-depth discussion of the two main approaches, but there's a few ways you could structure a project such as this. The first command will creates CMake configuration files inside folder build and the second one will generate the output program hello in bin folder. To build your project hello, just do $ cmake -H. At this point, you will have the folder with the following files: $ ls Now, let build the source code with CMake. # Set the output folder where your program will be created test.cpp # include using namespace std Īnd you saved it as test.cpp, then to compile it in CMake you should create a txt file named CMakeLists.txt # Specify the minimum version for CMake CMake will do the job of Makefile from now. So I assume that you know C++ and what the Makefile is. To install CMake in Linux, just simply do on your terminal # For Ubuntu If you have some troubles with gcc and Makefile, just move out to CMake. In a short conclusion, CMake help you to manage and build your source codes effectively. This information is gathered into the cache, which may be changed by the user prior to the generation of the native build files. For example, when CMake runs, it locates include files, libraries, and executables, and may encounter optional build directives. Another nice feature of CMake is that it generates a cache file that is designed to be used with a graphical editor. CMake also supports static and dynamic library builds. CMake supports in-place and out-of-place builds, and can therefore support multiple builds from a single source tree. CMake can generate a native build environment that will compile source code, create libraries, generate wrappers and build executables in arbitrary combinations. Simple configuration files placed in each source directory (called CMakeLists.txt files) are used to generate standard build files (e.g., makefiles on Unix and projects/workspaces in Windows MSVC) which are used in the usual way. Unlike many cross-platform systems, CMake is designed to be used in conjunction with the native build environment. What is CMake?ĬMake is an extensible, open-source system that manages the build process in an operating system and in a compiler-independent manner. ![]()
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