include_guard() # Disable cmkr if no cmake.toml file is found if(NOT EXISTS ${CMAKE_CURRENT_LIST_DIR}/cmake.toml) message(STATUS "[cmkr] Not found: ${CMAKE_CURRENT_LIST_DIR}/cmake.toml") macro(cmkr) endmacro() return() endif() # Add a build-time dependency on the contents of cmake.toml to regenerate the CMakeLists.txt when modified configure_file(${CMAKE_CURRENT_LIST_DIR}/cmake.toml ${CMAKE_CURRENT_BINARY_DIR}/cmake.toml COPYONLY) # Helper macro to execute a process (COMMAND_ERROR_IS_FATAL ANY is 3.19 and higher) macro(cmkr_exec) execute_process(COMMAND ${ARGV} RESULT_VARIABLE CMKR_EXEC_RESULT) if(NOT CMKR_EXEC_RESULT EQUAL 0) message(FATAL_ERROR "cmkr_exec(${ARGV}) failed (exit code ${CMKR_EXEC_RESULT})") endif() endmacro() # Windows-specific hack (CMAKE_EXECUTABLE_PREFIX is not set at the moment) if(WIN32) set(CMKR_EXECUTABLE_NAME "cmkr.exe") else() set(CMKR_EXECUTABLE_NAME "cmkr") endif() # Use cached cmkr if found if(DEFINED CACHE{CMKR_EXECUTABLE} AND EXISTS ${CMKR_EXECUTABLE}) message(VERBOSE "[cmkr] Found cmkr: '${CMKR_EXECUTABLE}'") else() if(DEFINED CACHE{CMKR_EXECUTABLE}) message(VERBOSE "[cmkr] '${CMKR_EXECUTABLE}' not found") endif() set(CMKR_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/_cmkr) set(CMKR_EXECUTABLE ${CMAKE_CURRENT_BINARY_DIR}/_cmkr/bin/${CMKR_EXECUTABLE_NAME} CACHE INTERNAL "Full path to cmkr executable") if(NOT EXISTS ${CMKR_EXECUTABLE}) message(VERBOSE "[cmkr] Bootstrapping '${CMKR_EXECUTABLE}'") message(STATUS "[cmkr] Fetching cmkr...") if(EXISTS ${CMKR_DIRECTORY}) cmkr_exec(${CMAKE_COMMAND} -E rm -rf ${CMKR_DIRECTORY}) endif() find_package(Git QUIET REQUIRED) set(CMKR_REPO "https://github.com/mrexodia/cmkr") cmkr_exec(${GIT_EXECUTABLE} clone ${CMKR_REPO} ${CMKR_DIRECTORY}) cmkr_exec(${CMAKE_COMMAND} ${CMKR_DIRECTORY} -B${CMKR_DIRECTORY}/build -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=${CMKR_DIRECTORY}) cmkr_exec(${CMAKE_COMMAND} --build ${CMKR_DIRECTORY}/build --parallel --config Release) cmkr_exec(${CMAKE_COMMAND} --install ${CMKR_DIRECTORY}/build --config Release --prefix ${CMKR_DIRECTORY} --component cmkr) if(NOT EXISTS ${CMKR_EXECUTABLE}) message(FATAL_ERROR "[cmkr] Failed to bootstrap '${CMKR_EXECUTABLE}'") endif() cmkr_exec(${CMKR_EXECUTABLE} version OUTPUT_VARIABLE CMKR_VERSION) string(STRIP ${CMKR_VERSION} CMKR_VERSION) message(STATUS "[cmkr] Bootstrapped ${CMKR_EXECUTABLE}") else() message(VERBOSE "[cmkr] Found cmkr: '${CMKR_EXECUTABLE}'") endif() endif() execute_process(COMMAND ${CMKR_EXECUTABLE} version OUTPUT_VARIABLE CMKR_VERSION RESULT_VARIABLE CMKR_EXEC_RESULT ) if(NOT CMKR_EXEC_RESULT EQUAL 0) unset(CMKR_EXECUTABLE CACHE) message(FATAL_ERROR "[cmkr] Failed to get version, try clearing the cache and rebuilding") endif() string(STRIP ${CMKR_VERSION} CMKR_VERSION) message(STATUS "[cmkr] Using ${CMKR_VERSION}") # This is the macro that contains black magic macro(cmkr) # When this macro is called from the generated file, fake some internal CMake variables get_source_file_property(CMKR_CURRENT_LIST_FILE ${CMAKE_CURRENT_LIST_FILE} CMKR_CURRENT_LIST_FILE) if(CMKR_CURRENT_LIST_FILE) set(CMAKE_CURRENT_LIST_FILE ${CMKR_CURRENT_LIST_FILE}) get_filename_component(CMAKE_CURRENT_LIST_DIR ${CMAKE_CURRENT_LIST_FILE} DIRECTORY) endif() # File-based include guard (include_guard is not documented to work) get_source_file_property(CMKR_INCLUDE_GUARD ${CMAKE_CURRENT_LIST_FILE} CMKR_INCLUDE_GUARD) if(NOT CMKR_INCLUDE_GUARD) set_source_files_properties(${CMAKE_CURRENT_LIST_FILE} PROPERTIES CMKR_INCLUDE_GUARD TRUE) # Generate CMakeLists.txt cmkr_exec(${CMKR_EXECUTABLE} gen -y WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR} OUTPUT_VARIABLE CMKR_GEN_OUTPUT ) string(STRIP ${CMKR_GEN_OUTPUT} CMKR_GEN_OUTPUT) message(STATUS "[cmkr] ${CMKR_GEN_OUTPUT}") # Copy the now-generated CMakeLists.txt to CMakerLists.txt # This is done because you cannot include() a file you are currently in set(CMKR_TEMP_FILE ${CMAKE_CURRENT_LIST_DIR}/CMakerLists.txt) configure_file(CMakeLists.txt ${CMKR_TEMP_FILE} COPYONLY) # Add the macro required for the hack at the start of the cmkr macro set_source_files_properties(${CMKR_TEMP_FILE} PROPERTIES CMKR_CURRENT_LIST_FILE ${CMAKE_CURRENT_LIST_FILE} ) # 'Execute' the newly-generated CMakeLists.txt include(${CMKR_TEMP_FILE}) # Delete the generated file file(REMOVE ${CMKR_TEMP_FILE}) # Do not execute the rest of the original CMakeLists.txt return() endif() endmacro()