![]() ![]() If extra arguments are found, then an author warning is issued. To set an environment variable, use the following syntax: set(ENV or if is an empty string, then this command will clear any existing value of the environment variable.Īrguments after are ignored. The keyword tells CMake to overwrite the existing value of the variable, if any. This documentation string will be displayed in the CMake GUI. The argument is used to provide a documentation string for the variable. Valid types include STRING, BOOL, INT, PATH, and FILEPATH. The argument is used to specify the type of the variable. This means that the variable will be remembered between CMake invocations. The CACHE keyword tells CMake to store the variable in the CMakeCache.txt file. To set a cache variable, use the following syntax: set(variable value CACHE ) To set a normal variable, use the following syntax: set(variable value)įor example, to set the variable MY_VARIABLE to the value hello, you would use the following command: set(MY_VARIABLE hello) It can be used to set normal variables, cache variables, and environment variables. The set() command in CMake is used to set the value of a variable. # This will cause CMake to generate an error. # The EXISTING_VAR variable will now have the value "This is the new value of the EXISTING_VAR variable." # Using a variable that has not been set. Set(EXISTING_VAR "This is the new value of the EXISTING_VAR variable.") ![]() set(EXISTING_VAR "This variable has already been set.") # 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.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |