To set a variable from a parent scope, add the PARENT_SCOPE specifier.Ī variable can be removed with the unset command. Variables are defined in a specific scope.Ī variable is set with the set command. Variables can be manipulated in scripts using commands as well. The -D options must be placed before the -P option. Variables can be set in the command-line with the -D options immediately followed by the variable name, an equal sign and the value. Lists are also strings with items separated with the character.Ī variable reference has the form $.") message("Hello World.") #prints a message Variables To print a message to the standard output, call message().
Flow control and operations on variables are also based on commands.
Multi-line comments are supported and can be nested.A comment can be appended after a command.Commands are written on separate lines.Commands can have input parameters (some are optional).Commands are written with a command name (case insensitive) and parenthesis.The cmake language is based on commands and every statement is a command. Some commands are not available when running cmake in script mode.įor example, if you write a script file called script.cmake, you can run it with the command: cmake -P script.cmake Language Commands ScriptsĬmake can execute commands without generating project files using the -P option with a script file name. They are located using the CMAKE_MODULE_PATH variable. Modules files can be added to the build system by calling the include() command. Subdirectories that also contain a CMakeLists.txt file can be added to the build by calling the add_subdirectory() command. Organization Directoriesĭirectory that contains a CMakeLists.txt file are entry points for the build system. BuildĬmake can also build the generated project.
Cmake include subdirectories generator#
Generate the project files in the build folder using a specific generator and the CMakeCache.txt from the configure step. The generated file can be inspected to see the exact configuration that cmake uses to setup the project. Parse the CMakeLists.txt files in the current folder to generate a CMakeCache.txt in the build folder.Ĭmake automatically detect platform and compiler features. They contain a list of commands in the cmake language to control the build system.Ĭmake has two main steps: configure and generate. The principle of cmake is to generate the project files for a specific platform using a custom language in order to create a target.Ī target is either an executable or a library and the cmake commands describe the requirements to build and use targets and setup their dependencies.ĬMakeLists.txt files are added in a directory hierarchy to control the build process. Since CMake 3.0, CMake is also known as Modern CMake and has been completely redesigned with a focus on targets and dependencies. CMake is not a build system but a tool for managing the build process.ĬMake can generate project files for different platforms and toolchains.ĬMake can run platform-specific commands to build targets (executables and libraries).
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