Second, you may want to install documentation or other Must run CMake on the subdirectory of the project, instead of the mainĭirectory. First, it can be confusing to some people that they Even ifĪll of the source code is in a subdirectory, we highly recommendĬreating a CMakeLists file for the top level directory. Level directory or in a directory named src or source. You can even run make in your src tree, but since there is no Makefile in your source tree, only CMakeLists.txt files, nothing will happen.Most small projects will have their source code in either the top In either of these cases, follow the steps above and run cmake in the top level build directory.ĬMake will create makefiles inside many of the folders inside a build directory and you can run make or make -j8 in any of these directories and it will do the right thing. Once you have run cmake, you do not need to run it again unless a) you create another build directory or b) your current build directory is destroyed or horribly broken. examples as we have to go back one directory (into ~/cs40) and then down into the examples folder to find the CMakeLists.txt folder. Note that the cmake command in this case is. QtCreator prefers this style by default, though you can configure these preferences. In the second case, we made a build-examples-Desktop-Default directory at the same depth as the examples folder. In the first case, we made the build directory inside the examples folder. In this case, it would be the CMakeLists.txt file in the examples directory. Next run cmake followed by the path to top-level CMakeLists.txt. To avoid this problem, first create an empty build directory and cd into that directory. gitignore file to ignore these auto-generated files and directories, it may be difficult to discern what changes were made by you and which were made by cmake. It may work, but it will create a bunch of auto-generated files in your source tree that may be hard to remove manually. in a top level build directoryĭon't run cmake directly in your src tree. The figure above should help reduce confusion. Additionally it can be confusing to know where to run make or cmake. The primary disadvantage of using a separate build directory is that it can sometimes get confusing if we are in the build tree or the source tree. We can safely remove the entire build directory to save space and return to a clean source tree.If needed, we can have multiple builds in separate build directories, e.g., a build with debug symbols or a build optimized for release.By not committing auto-generated files to git, we reduce git repo bloat and reduce the chance of merge conflicts.By not polluting the source tree, we avoid accidentally committing auto-generated files to git.Automatically built files are separated from the source tree. gitignore file in the source tree is usually set to ignore the entire build directory. Since these files can be automatically generated from the green source tree, there is no need to include them in git. The contents of these subfolders are generated automatically by cmake, make and the compiler, using the CMakeLists.txt files in the green source tree as instructions. Let's focus on the one on the right labeled cmake build. Separate from the green folders are the build directories. Each folder in this green subtree will usually have an accompanying CMakeLists.txt file which describes what files to compile and what executables to build. ui files, and all the files managed by git in this folder. It is the contents of your creative efforts. The green subdirectory above contains all source code you write. Having a separate build directory might be new to some, so here is a short explanation using the figure below for a project in the examples folder
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