1cb5712463
Components should set the COMPONENT_REQUIRES & COMPONENT_PRIVATE_REQUIRES variables to define their requirements.
217 lines
8.7 KiB
CMake
217 lines
8.7 KiB
CMake
# expand_requires.cmake is a utility cmake script to expand component requirements early in the build,
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# before the components are ready to be included.
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#
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# Parameters:
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# - COMPONENTS = Space-separated list of initial components to include in the build.
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# Can be empty, in which case all components are in the build.
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# - DEPENDENCIES_FILE = Path of generated cmake file which will contain the expanded dependencies for these
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# components.
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# - COMPONENT_DIRS = List of paths to search for all components.
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# - DEBUG = Set -DDEBUG=1 to debug component lists in the build.
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#
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# If successful, DEPENDENCIES_FILE can be expanded to set BUILD_COMPONENTS & BUILD_COMPONENT_PATHS with all
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# components required for the build, and the get_component_requirements() function to return each component's
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# recursively expanded requirements.
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#
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# TODO: Error out if a component requirement is missing
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cmake_minimum_required(VERSION 3.5)
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include("utilities.cmake")
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if(NOT DEPENDENCIES_FILE)
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message(FATAL_ERROR "DEPENDENCIES_FILE must be set.")
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endif()
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if(NOT COMPONENT_DIRS)
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message(FATAL_ERROR "COMPONENT_DIRS variable must be set")
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endif()
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spaces2list(COMPONENT_DIRS)
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function(debug message)
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if(DEBUG)
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message(STATUS "${message}")
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endif()
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endfunction()
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# Dummy register_component used to save requirements variables as global properties, for later expansion
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#
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# (expand_component_requirements() includes the component CMakeLists.txt, which then sets its component variables,
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# calls this dummy macro, and immediately exits again.)
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macro(register_component)
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spaces2list(COMPONENT_REQUIRES)
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set_property(GLOBAL PROPERTY "${COMPONENT}_REQUIRES" "${COMPONENT_REQUIRES}")
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spaces2list(COMPONENT_PRIV_REQUIRES)
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set_property(GLOBAL PROPERTY "${COMPONENT}_PRIV_REQUIRES" "${COMPONENT_PRIV_REQUIRES}")
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# This is tricky: we override register_component() so it returns out of the component CMakeLists.txt
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# (as we're declaring it as a macro not a function, so it doesn't have its own scope.)
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#
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# This means no targets are defined, and the component expansion ends early.
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return()
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endmacro()
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macro(register_config_only_component)
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register_component()
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endmacro()
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# Given a component name (find_name) and a list of component paths (component_paths),
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# return the path to the component in 'variable'
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#
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# Fatal error is printed if the component is not found.
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function(find_component_path find_name component_paths variable)
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foreach(path ${component_paths})
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get_filename_component(name "${path}" NAME)
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if("${name}" STREQUAL "${find_name}")
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set("${variable}" "${path}" PARENT_SCOPE)
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return()
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endif()
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endforeach()
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# TODO: find a way to print the dependency chain that lead to this not-found component
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message(WARNING "Required component ${find_name} is not found in any of the provided COMPONENT_DIRS")
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endfunction()
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# components_find_all: Search 'component_dirs' for components and return them
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# as a list of names in 'component_names' and a list of full paths in
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# 'component_paths'
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#
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# component_paths contains only unique component names. Directories
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# earlier in the component_dirs list take precedence.
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function(components_find_all component_dirs component_paths component_names)
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# component_dirs entries can be files or lists of files
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set(paths "")
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set(names "")
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# start by expanding the component_dirs list with all subdirectories
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foreach(dir ${component_dirs})
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# Iterate any subdirectories for values
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file(GLOB subdirs LIST_DIRECTORIES true "${dir}/*")
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foreach(subdir ${subdirs})
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set(component_dirs "${component_dirs};${subdir}")
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endforeach()
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endforeach()
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# Look for a component in each component_dirs entry
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foreach(dir ${component_dirs})
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file(GLOB component "${dir}/CMakeLists.txt")
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if(component)
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get_filename_component(component "${component}" DIRECTORY)
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get_filename_component(name "${component}" NAME)
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if(NOT name IN_LIST names)
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set(names "${names};${name}")
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set(paths "${paths};${component}")
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endif()
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else() # no CMakeLists.txt file
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# test for legacy component.mk and warn
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file(GLOB legacy_component "${dir}/component.mk")
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if(legacy_component)
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get_filename_component(legacy_component "${legacy_component}" DIRECTORY)
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message(WARNING "Component ${legacy_component} contains old-style component.mk but no CMakeLists.txt. "
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"Component will be skipped.")
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endif()
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endif()
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endforeach()
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set(${component_paths} ${paths} PARENT_SCOPE)
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set(${component_names} ${names} PARENT_SCOPE)
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endfunction()
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# expand_component_requirements: Recursively expand a component's requirements,
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# setting global properties BUILD_COMPONENTS & BUILD_COMPONENT_PATHS and
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# also invoking the components to call register_component() above,
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# which will add per-component global properties with dependencies, etc.
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function(expand_component_requirements component)
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get_property(build_components GLOBAL PROPERTY BUILD_COMPONENTS)
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if(${component} IN_LIST build_components)
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return() # already added this component
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endif()
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find_component_path("${component}" "${ALL_COMPONENT_PATHS}" component_path)
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debug("Expanding dependencies of ${component} @ ${component_path}")
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if(NOT component_path)
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set_property(GLOBAL APPEND PROPERTY COMPONENTS_NOT_FOUND ${component})
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return()
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endif()
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# include the component CMakeLists.txt to expand its properties
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# into the global cache (via register_component(), above)
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unset(COMPONENT_REQUIRES)
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unset(COMPONENT_PRIV_REQUIRES)
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set(COMPONENT ${component})
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include(${component_path}/CMakeLists.txt)
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set_property(GLOBAL APPEND PROPERTY BUILD_COMPONENT_PATHS ${component_path})
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set_property(GLOBAL APPEND PROPERTY BUILD_COMPONENTS ${component})
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get_property(requires GLOBAL PROPERTY "${component}_REQUIRES")
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get_property(requires_priv GLOBAL PROPERTY "${component}_PRIV_REQUIRES")
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foreach(req ${requires} ${requires_priv})
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expand_component_requirements(${req})
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endforeach()
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endfunction()
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# Main functionality goes here
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# Find every available component in COMPONENT_DIRS, save as ALL_COMPONENT_PATHS and ALL_COMPONENTS
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components_find_all("${COMPONENT_DIRS}" ALL_COMPONENT_PATHS ALL_COMPONENTS)
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if(NOT COMPONENTS)
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set(COMPONENTS "${ALL_COMPONENTS}")
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endif()
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spaces2list(COMPONENTS)
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debug("ALL_COMPONENT_PATHS ${ALL_COMPONENT_PATHS}")
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debug("ALL_COMPONENTS ${ALL_COMPONENTS}")
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set_property(GLOBAL PROPERTY BUILD_COMPONENTS "")
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set_property(GLOBAL PROPERTY BUILD_COMPONENT_PATHS "")
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set_property(GLOBAL PROPERTY COMPONENTS_NOT_FOUND "")
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foreach(component ${COMPONENTS})
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debug("Expanding initial component ${component}")
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expand_component_requirements(${component})
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endforeach()
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get_property(build_components GLOBAL PROPERTY BUILD_COMPONENTS)
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get_property(build_component_paths GLOBAL PROPERTY BUILD_COMPONENT_PATHS)
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get_property(not_found GLOBAL PROPERTY COMPONENTS_NOT_FOUND)
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debug("components in build: ${build_components}")
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debug("components in build: ${build_component_paths}")
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debug("components not found: ${not_found}")
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function(line contents)
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file(APPEND "${DEPENDENCIES_FILE}" "${contents}\n")
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endfunction()
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file(WRITE "${DEPENDENCIES_FILE}" "# Component requirements generated by expand_requirements.cmake\n\n")
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line("set(BUILD_COMPONENTS ${build_components})")
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line("set(BUILD_COMPONENT_PATHS ${build_component_paths})")
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line("")
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line("# get_component_requirements: Generated function to read the dependencies of a given component.")
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line("#")
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line("# Parameters:")
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line("# - component: Name of component")
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line("# - var_requires: output variable name. Set to recursively expanded COMPONENT_REQUIRES ")
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line("# for this component.")
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line("# - var_private_requires: output variable name. Set to recursively expanded COMPONENT_PRIV_REQUIRES ")
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line("# for this component.")
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line("#")
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line("# Throws a fatal error if 'componeont' is not found (indicates a build system problem).")
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line("#")
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line("function(get_component_requirements component var_requires var_private_requires)")
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foreach(build_component ${build_components})
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get_property(reqs GLOBAL PROPERTY "${build_component}_REQUIRES")
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get_property(private_reqs GLOBAL PROPERTY "${build_component}_PRIV_REQUIRES")
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line(" if(\"\$\{component}\" STREQUAL \"${build_component}\")")
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line(" set(\${var_requires} \"${reqs}\" PARENT_SCOPE)")
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line(" set(\${var_private_requires} \"${private_reqs}\" PARENT_SCOPE)")
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line(" return()")
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line(" endif()")
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endforeach()
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line(" message(FATAL_ERROR \"Component not found: \${component}\")")
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line("endfunction()")
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