Just to clarify, you can point CMake at either the source directory from the build directory, or at an existing build directory from anywhere. Note that working from the build directory is historically much more common, and some tools and commands (including CTest <3.20) still require running from the build directory. You should try to get used to using -build, as that will free you from using only make to build. So which set of methods should you use? As long as you do not forget to type the build directory as the argument, staying out of the build directory is shorter, and making source changes is easier from the source directory. # CMake 3.15+ only # From the source directory (pick one) ~/package $ make -C build install ~/package $ cmake -build build -target install ~/package $ cmake -install build # CMake 3.15+ only target install ~/package/build $ cmake -install. # From the build directory (pick one) ~/package/build $ make install ~/package/build $ cmake -build. If you are using a newer version of CMake (which you usually should be, except for checking compatibility with older CMake), you can instead do this: if you'd like, and it will call make or whatever build tool you are using. You can replace the make line with cmake -build. ~/package $ mkdir build ~/package $ cd build ~/package/build $ cmake. Here's the Classic CMake Build Procedure (TM): You can technically do an in-source build, but you'll have to be careful not to overwrite files or add them to git, so just don't. Unless otherwise noted, you should always make a build directory and build from there. This is true for almost all CMake projects, which is almost everything. JSON IntelliSense helps you edit the CMakeSettings.json file:įor more information about each of the properties in the file, see CMakeSettings.json schema reference.Before writing CMake, let's make sure you know how to run it to make things. This name appears in the C++ configuration dropdown. The following settings are available under the General heading: Configuration nameĬorresponds to the name setting. Visual Studio never modifies CMakeLists.txt automatically by using CMakeSettings.json you can customize the build through Visual Studio while leaving the CMake project files untouched so that others on your team can consume them with whatever tools they're using. This file provides command-line arguments and environment variables that are passed to CMake when you build the projects. The options that you choose in the editor are written to a file called CMakeSettings.json. The settings that you see in the editor might vary depending on which configuration is selected. You can add more configurations by choosing the green plus sign. Visual Studio provides one 圆4-Debug configuration by default. Now you see the Settings Editor with the installed configurations on the left. To open the CMake settings editor, select the Configuration drop-down in the main toolbar and choose Manage Configurations. However, if you prefer to edit the file directly, you can select the Edit JSON link in the upper right of the editor. It's intended to be a simpler alternative to manually editing the CMakeSettings.json file. The editor lets you add CMake configurations and customize their settings easily. If you maintain projects that use a CMakeSettings.json file for CMake build configuration, Visual Studio 2019 and later versions provide a CMake settings editor. For more information on CMakePresets.json, see Configure and build with CMake Presets. CMakePresets.json is supported directly by CMake and can be used to drive CMake generation and build from Visual Studio, from VS Code, in a Continuous Integration pipeline, and from the command line on Windows, Linux, and Mac. CMakePresets.json is supported by Visual Studio 2019 version 16.10 or later and is the recommended CMake configuration file. Visual Studio uses a CMake configuration file to drive CMake generation and build.
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