CMake call add_subdirectory within custom command

Question

I'm working with a code generator that produces C++ and a CMakeLists.txt file, unfortunately I cannot use this in my main CMakeLists.txt file for testing purposes. For example you have the following CMakeLists.txt file: project(SomeProject CXX C) add_custom_command(OUTPUT ${SRCS} COMMAND ${CODEGEN_CLI_PATH} -i "${INPUT}" -o "${OUT}" COMMENT "Generating sources" WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} VERBATIM ) add_custom_target(CODEGEN DEPENDS ${SRCS} ) # Needs to be executed after the custom command add_subdirectory(${GENERATED_CMAKE_LISTS_LOCATION}) Is it possible to use functions such as add_subdirectory only after you execute custom commands for a particular target, such as CODEGEN? I've already tried to execute it by adding an extra line to the existing custom command: COMMAND ${CMAKE_COMMAND} -D DIR=${GENERATED_CMAKE_LISTS_LOCATION} -P add_subdirectories.cmake Unfortuantly this doesn't work because it isn't allowed to execute functions like add_subdirectory in script mode. Neither I can manage to call custom made functions (that are executing add_subdirectory) from add_custom_command that are located in the same file. JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

Nope, it is not possible. The add_subdirectory command is run during configuration step, while CODEGEN is a target that runs during build. You seem to be doing something wrong, so the only advice I can give you is to use execute_process command to run commands you need. The execute_process command is executed during configuration stage, so it will be able to generate files you need before add_subdirectory. But again, please describe your problem, why do you want CMake to do that.