![]() ![]() # Setting a variable that is already set. # This will cause CMake to generate an error when it tries to use the PATH_VAR variable. set(PATH_VAR "/this/path/does/not/exist") # The GLOBAL_VAR variable will now have the value "This is the new value of the GLOBAL_VAR variable." # Setting a variable to an invalid value. ![]() set(GLOBAL_VAR "This is the new value of the GLOBAL_VAR variable.") # This will overwrite the GLOBAL_VAR variable. Set(LOCAL_VAR "This variable is in the local scope.") set(GLOBAL_VAR "This variable is in the global scope.") Here are some examples of common problems in CMake set: # Setting a variable in the wrong scope. Make sure that all variables are set before they are used You can use the cmake_variable_get() function to check whether or not a variable has been set.Avoid setting variables that are already set If you are unsure whether or not a variable has been set, you can use the cmake_find_file() or cmake_find_program() functions to check.Make sure that the values you are setting variables to are of the correct type This can be done by using the cmake_check_type_name() function.Use the CACHE keyword to set variables in the local scope This will help to prevent you from accidentally overwriting global variables.Here are some tips for avoiding these problems: It is important to make sure that all variables are set before they are used. This can be a common problem if you are using a CMakeLists.txt file that was written by someone else. Using a variable that has not been set If you try to use a variable that has not been set, CMake will generate an error.It is generally best to avoid setting variables that are already set. This can be problematic if you are not careful. Setting a variable that is already set If you try to set a variable that is already set, CMake will overwrite the existing value.For example, if you are setting a variable to a path, make sure that the path is valid and exists. It is important to make sure that the value you are setting the variable to is of the correct type. Setting a variable to an invalid value CMake variables can be set to a variety of different types, including strings, numbers, and paths.To set a variable in the local scope, use the CACHE keyword. The local scope is specific to the function or macro in which the variable is set. The global scope is the default, and variables set in the global scope can be accessed from anywhere in the CMakeLists.txt file. Not setting the correct variable scope CMake variables can be set in either the global scope or the local scope.JSON IntelliSense helps you edit the CMakeSettings. The settings include the configuration name, configuration type (set to Debug), toolset (set to msvc_x86), CMake toolchain file (empty), build root (contains $", The right pane shows the settings for the selected configuration. The left pane shows the installed configurations (x86-Debug). 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.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |