To run a basic add_custom_command in CMake, you can specify this command in your CMakeLists.txt file. This command allows you to add custom commands to be executed at build time.
To use add_custom_command, you typically provide various arguments such as OUTPUT, COMMAND, and DEPENDS. The OUTPUT argument specifies the output file name of the command, the COMMAND argument specifies the actual command to be run, and the DEPENDS argument specifies the dependencies of the command.
You can add a custom command by writing the following syntax in your CMakeLists.txt file:
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add_custom_command( OUTPUT output_file.txt COMMAND your_command DEPENDS dependency_file.txt ) |
After adding the custom command, you can use the generated output file in your build process. This is particularly useful for tasks that are not handled by default build commands in CMake.
Keep in mind that add_custom_command is a powerful feature in CMake that allows you to extend the build process with custom commands. It can be useful for various tasks such as generating files, running scripts, or executing custom commands at build time.
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How to run a command on specific platforms with add_custom_command in cmake?
To run a command on specific platforms with add_custom_command in CMake, you can use the following syntax:
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if(APPLE) add_custom_command(TARGET target_name POST_BUILD COMMAND command_to_run WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} COMMENT "Running command on macOS" ) elseif(UNIX) add_custom_command(TARGET target_name POST_BUILD COMMAND command_to_run WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} COMMENT "Running command on Unix" ) elseif(WIN32) add_custom_command(TARGET target_name POST_BUILD COMMAND command_to_run WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} COMMENT "Running command on Windows" ) endif() |
In this example, the add_custom_command is used to run a specific command on different platforms based on the if-else conditions. You can replace "target_name" with the name of your target, "command_to_run" with the actual command you want to execute, and update the comments accordingly. This way, the command will only be executed on the specified platforms.
How to specify outputs for add_custom_command in cmake?
To specify outputs for an add_custom_command in CMake, you can use the OUTPUT option. Here is an example:
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add_custom_command( OUTPUT output_file.txt COMMAND <command to generate output_file.txt> DEPENDS input_file.txt ) |
In this example, output_file.txt is specified as the output of the custom command. The command specified in the COMMAND option will generate output_file.txt, and CMake will track the dependencies specified in the DEPENDS option to determine when the custom command needs to be re-run.
How to specify a target using add_custom_command?
To specify a target using add_custom_command in CMake, you need to provide the target name as the first argument of the add_custom_command function. This can be done by setting the TARGET option to the desired target name.
Here is an example of how to specify a target using add_custom_command in CMake:
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add_custom_command(TARGET my_target POST_BUILD COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_CURRENT_SOURCE_DIR}/input_directory ${CMAKE_CURRENT_BINARY_DIR}/output_directory COMMENT "Copying input directory to output directory") |
In this example, my_target is the target name specified in the add_custom_command function. The POST_BUILD option indicates that this command should be executed after the target has been built. The COMMAND option specifies the actual command to be executed, which in this case is copying a directory using ${CMAKE_COMMAND} and -E copy_directory. The COMMENT option provides a description of the command that will be displayed during the build process.
By providing the target name as the first argument of the add_custom_command function, you can specify which target the custom command should be associated with in your CMake project.
