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OVMS3-idf/tools/cmake/component.cmake
Renz Christian Bagaporo 297b2c5a39 cmake: evaluate component requirements in one go 
!4452 simplified early expansion by using an early expansion script that
only does one thing: get the public and private requirements for each
component, albeit one by one. This was also dependent on parsing
the command output of the expansion script.  This commit makes it so that a list of all
components to be processed to passed to the expansion script, generating a cmake
file that sets each component requirements in one go.

This also makes sure that only components that registered themselves get
included in the final build list.
2019-06-11 18:09:26 +08:00

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#
# Internal function for retrieving component properties from a component target.
#
function(__component_get_property var component_target property)
get_property(val TARGET ${component_target} PROPERTY ${property})
set(${var} "${val}" PARENT_SCOPE)
endfunction()
#
# Internal function for setting component properties on a component target. As with build properties,
# set properties are also keeped track of.
#
function(__component_set_property component_target property val)
cmake_parse_arguments(_ "APPEND" "" "" ${ARGN})
if(__APPEND)
set_property(TARGET ${component_target} APPEND PROPERTY ${property} "${val}")
else()
set_property(TARGET ${component_target} PROPERTY ${property} "${val}")
endif()
# Keep track of set component properties
__component_get_property(properties ${component_target} __COMPONENT_PROPERTIES)
if(NOT property IN_LIST properties)
__component_set_property(${component_target} __COMPONENT_PROPERTIES ${property} APPEND)
endif()
endfunction()
#
# Given a component name or alias, get the corresponding component target.
#
function(__component_get_target var name_or_alias)
# Look at previously resolved names or aliases
idf_build_get_property(component_names_resolved __COMPONENT_NAMES_RESOLVED)
list(FIND component_names_resolved ${name_or_alias} result)
if(NOT result EQUAL -1)
# If it has been resolved before, return that value. The index is the same
# as in __COMPONENT_NAMES_RESOLVED as these are parallel lists.
idf_build_get_property(component_targets_resolved __COMPONENT_TARGETS_RESOLVED)
list(GET component_targets_resolved ${result} target)
set(${var} ${target} PARENT_SCOPE)
return()
endif()
idf_build_get_property(component_targets __COMPONENT_TARGETS)
# Assume first that the paramters is an alias.
string(REPLACE "::" "_" name_or_alias "${name_or_alias}")
set(component_target ___${name_or_alias})
if(component_target IN_LIST component_targets)
set(${var} ${component_target} PARENT_SCOPE)
set(target ${component_target})
else() # assumption is wrong, try to look for it manually
unset(target)
foreach(component_target ${component_targets})
__component_get_property(_component_name ${component_target} COMPONENT_NAME)
if(name_or_alias STREQUAL _component_name)
# There should only be one component of the same name
if(NOT target)
set(target ${component_target})
else()
message(FATAL_ERROR "Multiple components with name '${name_or_alias}' found.")
return()
endif()
endif()
endforeach()
set(${var} ${target} PARENT_SCOPE)
endif()
# Save the resolved name or alias
if(target)
idf_build_set_property(__COMPONENT_NAMES_RESOLVED ${name_or_alias} APPEND)
idf_build_set_property(__COMPONENT_TARGETS_RESOLVED ${target} APPEND)
endif()
endfunction()
#
# Called during component registration, sets basic properties of the current component.
#
macro(__component_set_properties)
__component_get_property(type ${component_target} COMPONENT_TYPE)
# Fill in the rest of component property
__component_set_property(${component_target} SRCS "${sources}")
__component_set_property(${component_target} INCLUDE_DIRS "${__INCLUDE_DIRS}")
if(type STREQUAL LIBRARY)
__component_set_property(${component_target} PRIV_INCLUDE_DIRS "${__PRIV_INCLUDE_DIRS}")
endif()
__component_set_property(${component_target} LDFRAGMENTS "${__LDFRAGMENTS}")
__component_set_property(${component_target} EMBED_FILES "${__EMBED_FILES}")
__component_set_property(${component_target} EMBED_TXTFILES "${__EMBED_TXTFILES}")
__component_set_property(${component_target} REQUIRED_IDF_TARGETS "${__REQUIRED_IDF_TARGETS}")
endmacro()
#
# Perform a quick check if given component dir satisfies basic requirements.
#
function(__component_dir_quick_check var component_dir)
set(res 1)
get_filename_component(abs_dir ${component_dir} ABSOLUTE)
# Check this is really a directory and that a CMakeLists.txt file for this component exists
# - warn and skip anything which isn't valid looking (probably cruft)
if(NOT IS_DIRECTORY "${abs_dir}")
message(STATUS "Unexpected file in components directory: ${abs_dir}")
set(res 0)
endif()
get_filename_component(base_dir ${abs_dir} NAME)
string(SUBSTRING "${base_dir}" 0 1 first_char)
if(NOT first_char STREQUAL ".")
if(NOT EXISTS "${abs_dir}/CMakeLists.txt")
message(STATUS "Component directory ${abs_dir} does not contain a CMakeLists.txt file. "
"No component will be added")
set(res 0)
endif()
else()
set(res 0) # quietly ignore dot-folders
endif()
set(${var} ${res} PARENT_SCOPE)
endfunction()
#
# Write a CMake file containing all component and their properties. This is possible because each component
# keeps a list of all its properties.
#
function(__component_write_properties output_file)
idf_build_get_property(component_targets __COMPONENT_TARGETS)
foreach(component_target ${component_targets})
__component_get_property(component_properties ${component_target} __COMPONENT_PROPERTIES)
foreach(property ${component_properties})
__component_get_property(val ${component_target} ${property})
set(component_properties_text
"${component_properties_text}\nset(__component_${component_target}_${property} ${val})")
endforeach()
file(WRITE ${output_file} "${component_properties_text}")
endforeach()
endfunction()
#
# Add a component to process in the build. The components are keeped tracked of in property
# __COMPONENT_TARGETS in component target form.
#
function(__component_add component_dir prefix)
# For each component, two entities are created: a component target and a component library. The
# component library is created during component registration (the actual static/interface library).
# On the other hand, component targets are created early in the build
# (during adding component as this function suggests).
# This is so that we still have a target to attach properties to up until the component registration.
# Plus, interface libraries have limitations on the types of properties that can be set on them,
# so later in the build, these component targets actually contain the properties meant for the
# corresponding component library.
idf_build_get_property(component_targets __COMPONENT_TARGETS)
get_filename_component(abs_dir ${component_dir} ABSOLUTE)
get_filename_component(base_dir ${abs_dir} NAME)
if(NOT EXISTS "${abs_dir}/CMakeLists.txt")
message(FATAL_ERROR "Directory '${component_dir}' does not contain a component.")
endif()
set(component_name ${base_dir})
# The component target has three underscores as a prefix. The corresponding component library
# only has two.
set(component_target ___${prefix}_${component_name})
# If a component of the same name has not been added before If it has been added
# before just override the properties. As a side effect, components added later
# 'override' components added earlier.
if(NOT component_target IN_LIST component_targets)
if(NOT TARGET ${component_target})
add_custom_target(${component_target} EXCLUDE_FROM_ALL)
endif()
idf_build_set_property(__COMPONENT_TARGETS ${component_target} APPEND)
endif()
set(component_lib __${prefix}_${component_name})
set(component_dir ${abs_dir})
set(component_alias ${prefix}::${component_name}) # The 'alias' of the component library,
# used to refer to the component outside
# the build system. Users can use this name
# to resolve ambiguity with component names
# and to link IDF components to external targets.
# Set the basic properties of the component
__component_set_property(${component_target} COMPONENT_LIB ${component_lib})
__component_set_property(${component_target} COMPONENT_NAME ${component_name})
__component_set_property(${component_target} COMPONENT_DIR ${component_dir})
__component_set_property(${component_target} COMPONENT_ALIAS ${component_alias})
__component_set_property(${component_target} __PREFIX ${prefix})
# Set Kconfig related properties on the component
__kconfig_component_init(${component_target})
endfunction()
#
# Given a component directory, get the requirements by expanding it early. The expansion is performed
# using a separate CMake script (the expansion is performed in a separate instance of CMake in scripting mode).
#
function(__component_get_requirements)
idf_build_get_property(idf_path IDF_PATH)
idf_build_get_property(build_dir BUILD_DIR)
set(build_properties_file ${build_dir}/build_properties.temp.cmake)
set(component_properties_file ${build_dir}/component_properties.temp.cmake)
set(component_requires_file ${build_dir}/component_requires.temp.cmake)
__build_write_properties(${build_properties_file})
__component_write_properties(${component_properties_file})
execute_process(COMMAND "${CMAKE_COMMAND}"
-D "BUILD_PROPERTIES_FILE=${build_properties_file}"
-D "COMPONENT_PROPERTIES_FILE=${component_properties_file}"
-D "COMPONENT_REQUIRES_FILE=${component_requires_file}"
-P "${idf_path}/tools/cmake/scripts/component_get_requirements.cmake"
RESULT_VARIABLE result
ERROR_VARIABLE error
)
if(NOT result EQUAL 0)
message(FATAL_ERROR "${error}")
endif()
include(${component_requires_file})
file(REMOVE ${build_properties_file})
file(REMOVE ${component_properties_file})
file(REMOVE ${component_requires_file})
endfunction()
# __component_add_sources, __component_check_target
#
# Utility macros for component registration. Adds source files and checks target requirements
# respectively.
macro(__component_add_sources sources)
set(sources "")
if(__SRCS)
if(__SRC_DIRS)
message(WARNING "SRCS and SRC_DIRS are both specified; ignoring SRC_DIRS.")
endif()
foreach(src ${__SRCS})
get_filename_component(src "${src}" ABSOLUTE BASE_DIR ${COMPONENT_DIR})
list(APPEND sources ${src})
endforeach()
else()
if(__SRC_DIRS)
foreach(dir ${__SRC_DIRS})
get_filename_component(abs_dir ${dir} ABSOLUTE BASE_DIR ${COMPONENT_DIR})
if(NOT IS_DIRECTORY ${abs_dir})
message(FATAL_ERROR "SRC_DIRS entry '${dir}' does not exist.")
endif()
file(GLOB dir_sources "${abs_dir}/*.c" "${abs_dir}/*.cpp" "${abs_dir}/*.S")
if(dir_sources)
foreach(src ${dir_sources})
get_filename_component(src "${src}" ABSOLUTE BASE_DIR ${COMPONENT_DIR})
list(APPEND sources "${src}")
endforeach()
else()
message(WARNING "No source files found for SRC_DIRS entry '${dir}'.")
endif()
endforeach()
endif()
if(__EXCLUDE_SRCS)
foreach(src ${__EXCLUDE_SRCS})
get_filename_component(src "${src}" ABSOLUTE)
list(REMOVE_ITEM source "${src}")
endforeach()
endif()
endif()
list(REMOVE_DUPLICATES sources)
endmacro()
macro(__component_check_target)
if(__REQUIRED_IDF_TARGETS)
idf_build_get_property(idf_target IDF_TARGET)
if(NOT idf_target IN_LIST __REQUIRED_IDF_TARGETS)
message(FATAL_ERROR "Component ${COMPONENT_NAME} only supports targets: ${__REQUIRED_IDF_TARGETS}")
endif()
endif()
endmacro()
# idf_component_get_property
#
# @brief Retrieve the value of the specified component property
#
# @param[out] var the variable to store the value of the property in
# @param[in] component the component name or alias to get the value of the property of
# @param[in] property the property to get the value of
#
# @param[in, optional] GENERATOR_EXPRESSION (option) retrieve the generator expression for the property
# instead of actual value
function(idf_component_get_property var component property)
cmake_parse_arguments(_ "GENERATOR_EXPRESSION" "" "" ${ARGN})
__component_get_target(component_target ${component})
if(__GENERATOR_EXPRESSION)
set(val "$<TARGET_PROPERTY:${component_target},${property}>")
else()
__component_get_property(val ${component_target} ${property})
endif()
set(${var} "${val}" PARENT_SCOPE)
endfunction()
# idf_component_set_property
#
# @brief Set the value of the specified component property related. The property is
# also added to the internal list of component properties if it isn't there already.
#
# @param[in] component component name or alias of the component to set the property of
# @param[in] property the property to set the value of
# @param[out] value value of the property to set to
#
# @param[in, optional] APPEND (option) append the value to the current value of the
# property instead of replacing it
function(idf_component_set_property component property val)
cmake_parse_arguments(_ "APPEND" "" "" ${ARGN})
__component_get_target(component_target ${component})
if(__APPEND)
__component_set_property(${component_target} ${property} "${val}" APPEND)
else()
__component_set_property(${component_target} ${property} "${val}")
endif()
endfunction()
# idf_component_register
#
# @brief Register a component to the build, creating component library targets etc.
#
# @param[in, optional] SRCS (multivalue) list of source files for the component
# @param[in, optional] SRC_DIRS (multivalue) list of source directories to look for source files
# in (.c, .cpp. .S); ignored when SRCS is specified.
# @param[in, optional] EXCLUDE_SRCS (multivalue) used to exclude source files for the specified
# SRC_DIRS
# @param[in, optional] INCLUDE_DIRS (multivalue) public include directories for the created component library
# @param[in, optional] PRIV_INCLUDE_DIRS (multivalue) private include directories for the created component library
# @param[in, optional] LDFRAGMENTS (multivalue) linker script fragments for the component
# @param[in, optional] REQUIRES (multivalue) publicly required components in terms of usage requirements
# @param[in, optional] PRIV_REQUIRES (multivalue) privately required components in terms of usage requirements
# or components only needed for functions/values defined in its project_include.cmake
# @param[in, optional] REQUIRED_IDF_TARGETS (multivalue) the list of IDF build targets that the component only supports
# @param[in, optional] EMBED_FILES (multivalue) list of binary files to embed with the component
# @param[in, optional] EMBED_TXTFILES (multivalue) list of text files to embed with the component
function(idf_component_register)
set(options)
set(single_value)
set(multi_value SRCS SRC_DIRS EXCLUDE_SRCS
INCLUDE_DIRS PRIV_INCLUDE_DIRS LDFRAGMENTS REQUIRES
PRIV_REQUIRES REQUIRED_IDF_TARGETS EMBED_FILES EMBED_TXTFILES)
cmake_parse_arguments(_ "${options}" "${single_value}" "${multi_value}" ${ARGN})
if(NOT __idf_component_context)
message(FATAL_ERROR "Called idf_component_register from a non-component directory.")
endif()
__component_check_target()
__component_add_sources(sources)
# Create the final target for the component. This target is the target that is
# visible outside the build system.
__component_get_target(component_target ${COMPONENT_ALIAS})
__component_get_property(component_lib ${component_target} COMPONENT_LIB)
# Use generator expression so that users can append/override flags even after call to
# idf_build_process
idf_build_get_property(include_directories INCLUDE_DIRECTORIES GENERATOR_EXPRESSION)
idf_build_get_property(compile_options COMPILE_OPTIONS GENERATOR_EXPRESSION)
idf_build_get_property(c_compile_options C_COMPILE_OPTIONS GENERATOR_EXPRESSION)
idf_build_get_property(cxx_compile_options CXX_COMPILE_OPTIONS GENERATOR_EXPRESSION)
idf_build_get_property(common_reqs ___COMPONENT_REQUIRES_COMMON)
include_directories("${include_directories}")
add_compile_options("${compile_options}")
add_c_compile_options("${c_compile_options}")
add_cxx_compile_options("${cxx_compile_options}")
# Unfortunately add_definitions() does not support generator expressions. A new command
# add_compile_definition() does but is only available on CMake 3.12 or newer. This uses
# add_compile_options(), which can add any option as the workaround.
#
# TODO: Use add_compile_definitions() once minimum supported version is 3.12 or newer.
idf_build_get_property(compile_definitions COMPILE_DEFINITIONS GENERATOR_EXPRESSION)
add_compile_options("${compile_definitions}")
list(REMOVE_ITEM common_reqs ${component_lib})
link_libraries(${common_reqs})
idf_build_get_property(sdkconfig_h SDKCONFIG_HEADER)
get_filename_component(sdkconfig_h ${sdkconfig_h} DIRECTORY)
# The contents of 'sources' is from the __component_add_sources call
if(sources OR __EMBED_FILES OR __EMBED_TXTFILES)
add_library(${component_lib} STATIC ${sources})
__component_set_property(${component_target} COMPONENT_TYPE LIBRARY)
target_include_directories(${component_lib} PUBLIC ${__INCLUDE_DIRS})
target_include_directories(${component_lib} PRIVATE ${__PRIV_INCLUDE_DIRS})
target_include_directories(${component_lib} PUBLIC ${sdkconfig_h})
set_target_properties(${component_lib} PROPERTIES OUTPUT_NAME ${COMPONENT_NAME})
__ldgen_add_component(${component_lib})
else()
add_library(${component_lib} INTERFACE)
__component_set_property(${component_target} COMPONENT_TYPE CONFIG_ONLY)
target_include_directories(${component_lib} INTERFACE ${__INCLUDE_DIRS})
target_include_directories(${component_lib} INTERFACE ${sdkconfig_h})
endif()
# Alias the static/interface library created for linking to external targets.
# The alias is the <prefix>::<component name> name.
__component_get_property(component_alias ${component_target} COMPONENT_ALIAS)
add_library(${component_alias} ALIAS ${component_lib})
# Perform other component processing, such as embedding binaries and processing linker
# script fragments
foreach(file ${__EMBED_FILES})
target_add_binary_data(${component_lib} "${file}" "BINARY")
endforeach()
foreach(file ${__EMBED_TXTFILES})
target_add_binary_data(${component_lib} "${file}" "TEXT")
endforeach()
if(__LDFRAGMENTS)
__ldgen_add_fragment_files("${__LDFRAGMENTS}")
endif()
# Add the component to built components
idf_build_set_property(__BUILD_COMPONENTS ${component_lib} APPEND)
idf_build_set_property(BUILD_COMPONENTS ${component_alias} APPEND)
# Make the COMPONENT_LIB variable available in the component CMakeLists.txt
set(COMPONENT_LIB ${component_lib} PARENT_SCOPE)
# COMPONENT_TARGET is deprecated but is made available with same function
# as COMPONENT_LIB for compatibility.
set(COMPONENT_TARGET ${component_lib} PARENT_SCOPE)
endfunction()
#
# Deprecated functions
#
# register_component
#
# Compatibility function for registering 3.xx style components.
macro(register_component)
spaces2list(COMPONENT_SRCS)
spaces2list(COMPONENT_SRCDIRS)
spaces2list(COMPONENT_ADD_INCLUDEDIRS)
spaces2list(COMPONENT_PRIV_INCLUDEDIRS)
spaces2list(COMPONENT_REQUIRES)
spaces2list(COMPONENT_PRIV_REQUIRES)
spaces2list(COMPONENT_ADD_LDFRAGMENTS)
spaces2list(COMPONENT_EMBED_FILES)
spaces2list(COMPONENT_EMBED_TXTFILES)
spaces2list(COMPONENT_SRCEXCLUDE)
idf_component_register(SRCS "${COMPONENT_SRCS}"
SRC_DIRS "${COMPONENT_SRCDIRS}"
INCLUDE_DIRS "${COMPONENT_ADD_INCLUDEDIRS}"
PRIV_INCLUDE_DIRS "${COMPONENT_PRIV_INCLUDEDIRS}"
REQUIRES "${COMPONENT_REQUIRES}"
PRIV_REQUIRES "${COMPONENT_PRIV_REQUIRES}"
LDFRAGMENTS "${COMPONENT_ADD_LDFRAGMENTS}"
EMBED_FILES "${COMPONENT_EMBED_FILES}"
EMBED_TXTFILES "${COMPONENT_EMBED_TXTFILES}"
EXCLUDE_SRCS "${COMPONENT_SRCEXCLUDE}")
endmacro()
# require_idf_targets
#
# Compatibility function for requiring IDF build targets for 3.xx style components.
function(require_idf_targets)
set(__REQUIRED_IDF_TARGETS "${ARGN}")
__component_check_target()
endfunction()
# register_config_only_component
#
# Compatibility function for registering 3.xx style config components.
macro(register_config_only_component)
register_component()
endmacro()
# component_compile_options
#
# Wrapper around target_compile_options that passes the component name
function(component_compile_options)
target_compile_options(${COMPONENT_LIB} PRIVATE ${ARGV})
endfunction()
# component_compile_definitions
#
# Wrapper around target_compile_definitions that passes the component name
function(component_compile_definitions)
target_compile_definitions(${COMPONENT_LIB} PRIVATE ${ARGV})
endfunction()
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