OVMS3-idf/tools/cmake/scripts/expand_requirements.cmake
2018-09-11 09:44:12 +08:00

252 lines
11 KiB
CMake

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