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seL4/tools/helpers.cmake
Anna Lyons bc61a7f3bd python2 --> python3 
Update all scripts and build system to call python3, given python2's
upcoming doom. Use sys.maxsize instead of sys.maxint in one script
(maxint does not exist in python3).
2019-08-08 10:19:24 +10:00

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CMake
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#
# Copyright 2017, Data61
# Commonwealth Scientific and Industrial Research Organisation (CSIRO)
# ABN 41 687 119 230.
#
# This software may be distributed and modified according to the terms of
# the GNU General Public License version 2. Note that NO WARRANTY is provided.
# See "LICENSE_GPLv2.txt" for details.
#
# @TAG(DATA61_GPL)
#
cmake_minimum_required(VERSION 3.8.2)
# Wrapper function around find_file that generates a fatal error if it isn't found
# Is equivalent to find_file except that it adds CMAKE_CURRENT_SOURCE_DIR as a path and sets
# CMAKE_FIND_ROOT_PATH_BOTH
function(RequireFile config_name file_name)
find_file(
${config_name} "${file_name}"
PATHS "${CMAKE_CURRENT_SOURCE_DIR}"
CMAKE_FIND_ROOT_PATH_BOTH ${ARGV}
)
if("${${config_name}}" STREQUAL "${config_name}-NOTFOUND")
message(FATAL_ERROR "Failed to find required file ${file_name}")
endif()
mark_as_advanced(FORCE ${config_name})
endfunction(RequireFile)
# Helper function for converting a filename to an absolute path. It first converts to
# an absolute path based in the current source directory, and if the results in a file
# that doesn't exist it returns an absolute path based from the binary directory
# This file check is done at generation time and is considered safe as source files
# should not be being added as part of the build step (except into the build directory)
function(get_absolute_source_or_binary output input)
get_filename_component(test "${input}" ABSOLUTE BASE_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
if(NOT EXISTS "${test}")
get_filename_component(test "${input}" ABSOLUTE BASE_DIR "${CMAKE_CURRENT_BINARY_DIR}")
endif()
set("${output}" "${test}" PARENT_SCOPE)
endfunction(get_absolute_source_or_binary)
function(get_absolute_list_source_or_binary output input)
get_filename_component(test "${input}" ABSOLUTE BASE_DIR "${CMAKE_CURRENT_LIST_DIR}")
if(NOT EXISTS "${test}")
get_absolute_source_or_binary(test ${input})
endif()
set("${output}" "${test}" PARENT_SCOPE)
endfunction()
# Generates a custom command that preprocesses an input file into an output file
# Uses the current compilation settings as well as any EXTRA_FLAGS provided. Can also
# be given any EXTRA_DEPS to depend upon
# A target with the name `output_target` will be generated to create a target based dependency
# for the output file
# Output and input files will be converted to absolute paths based on the following rules
# * Output is assumed to be in CMAKE_CURRENT_BINARY_DIR
# * Input is assumed to be in CMAKE_CURRENT_SOURCE_DIR if it resolves to a file that exists
# otherwise it is assumed to be in CMAKE_CURRENT_BINARY_DIR
function(cppfile output output_target input)
cmake_parse_arguments(PARSE_ARGV 3 "CPP" "" "EXACT_NAME" "EXTRA_DEPS;EXTRA_FLAGS")
if(NOT "${CPP_UNPARSED_ARGUMENTS}" STREQUAL "")
message(FATAL_ERROR "Unknown arguments to cppfile: ${CPP_UNPARSED_ARGUMENTS}")
endif()
get_absolute_source_or_binary(input "${input}")
set(file_copy_name "${output_target}_temp.c")
# If EXACT_NAME then we copy the input file to the name given by the caller. Otherwise
# generate a rule for copying the input file to a default name.
if(CPP_EXACT_NAME)
set(file_copy_name ${CPP_EXACT_NAME})
endif()
add_custom_command(
OUTPUT ${file_copy_name}
COMMAND
${CMAKE_COMMAND} -E copy ${input} ${CMAKE_CURRENT_BINARY_DIR}/${file_copy_name}
COMMENT "Creating C input file for preprocessor"
DEPENDS ${CPP_EXTRA_DEPS} ${input}
)
add_custom_target(${output_target}_copy_in DEPENDS ${file_copy_name})
# Now generate an object library to persuade cmake to just do compilation and not try
# and link our 'object' files
add_library(${output_target}_temp_lib OBJECT ${file_copy_name})
add_dependencies(${output_target}_temp_lib ${output_target}_copy_in)
# Give the preprecess flag
target_compile_options(${output_target}_temp_lib PRIVATE -E)
# Give any other flags from the user
target_compile_options(${output_target}_temp_lib PRIVATE ${CPP_EXTRA_FLAGS})
# Now copy from the random name cmake gave our object file into the one desired by the user
add_custom_command(
OUTPUT ${output}
COMMAND
${CMAKE_COMMAND} -E copy $<TARGET_OBJECTS:${output_target}_temp_lib> ${output}
DEPENDS ${output_target}_temp_lib $<TARGET_OBJECTS:${output_target}_temp_lib>
)
add_custom_target(${output_target} DEPENDS ${output})
endfunction(cppfile)
# Function to generate a custom command to process a bitfield file. The input
# (pbf_path) is either a .bf file or, if you used pre-processor directives, a
# pre-processed .bf file. As this invokes a python tool that places a file
# in the current working directory a unqiue 'work_dir' needs to be provided
# for this command to execute in
# This function is not intended to be used directly, rather one of its wrappers
# that is specialized to generate a specific kind of output should be used
# These wrappers work by passing the additional 'args' that get passed on to
# the bitfield generator
function(GenBFCommand args target_name pbf_path pbf_target deps)
# Since we're going to change the working directory first convert any paths to absolute
get_filename_component(
target_name_absolute
"${target_name}"
ABSOLUTE
BASE_DIR
"${CMAKE_CURRENT_BINARY_DIR}"
)
get_absolute_source_or_binary(pbf_path_absolute "${pbf_path}")
add_custom_command(
OUTPUT "${target_name_absolute}"
COMMAND
"${PYTHON3}" "${BF_GEN_PATH}" "${args}" "${pbf_path_absolute}" "${target_name_absolute}"
DEPENDS
"${BF_GEN_PATH}"
"${pbf_path_absolute}"
"${pbf_target}"
${deps}
COMMENT "Generating from ${pbf_path}" COMMAND_EXPAND_LISTS
VERBATIM
)
endfunction(GenBFCommand)
# Wrapper function for generating both a target and command to process a bitfield file
function(GenBFTarget args target_name target_file pbf_path pbf_target deps)
GenBFCommand("${args}" "${target_file}" "${pbf_path}" "${pbf_target}" "${deps}")
add_custom_target(${target_name} DEPENDS "${target_file}")
endfunction(GenBFTarget)
# Wrapper around GenBFTarget for generating a C header file out of a bitfield specification
# environment is empty for kernel generation and "libsel4" for generating non kernel headers
# prunes is an optional list of files that will be passed as --prune options to the bitfield
# generator
function(GenHBFTarget environment target_name target_file pbf_path pbf_target prunes deps)
set(args "")
if(NOT "${environment}" STREQUAL "")
list(APPEND args --environment "${environment}")
endif()
foreach(prune IN LISTS prunes)
get_absolute_source_or_binary(prune_absolute "${prune}")
list(APPEND args "--prune" "${prune_absolute}")
endforeach()
list(APPEND deps ${prunes})
GenBFTarget("${args}" "${target_name}" "${target_file}" "${pbf_path}" "${pbf_target}" "${deps}")
endfunction(GenHBFTarget)
# Wrapper for generating different kinds of .thy files from bitfield specifications
function(GenThyBFTarget args target_name target_file pbf_path pbf_target prunes deps)
get_filename_component(cspec_dir "${CSPEC_DIR}" ABSOLUTE BASE_DIR)
list(APPEND args --cspec-dir "${cspec_dir}")
if(SKIP_MODIFIES)
list(APPEND args "--skip_modifies")
endif()
foreach(prune IN LISTS prunes)
list(APPEND args "--prune" "${prune}")
endforeach()
GenBFTarget("${args}" "${target_name}" "${target_file}" "${pbf_path}" "${pbf_target}" "${deps}")
endfunction(GenThyBFTarget)
# Generate hol definitions from a bitfield specification
function(GenDefsBFTarget target_name target_file pbf_path pbf_target prunes deps)
set(args "")
list(APPEND args --hol_defs)
GenThyBFTarget(
"${args}"
"${target_name}"
"${target_file}"
"${pbf_path}"
"${pbf_target}"
"${prunes}"
"${deps}"
)
endfunction(GenDefsBFTarget)
# Generate proofs from a bitfield specification
function(GenProofsBFTarget target_name target_file pbf_path pbf_target prunes deps)
set(args "")
# Get an absolute path to cspec_dir so that the final theory file is portable
list(
APPEND
args
--hol_proofs
--umm_types
"${UMM_TYPES}"
)
if(SORRY_BITFIELD_PROOFS)
list(APPEND args "--sorry_lemmas")
endif()
list(
APPEND
args
"--toplevel;$<JOIN:$<TARGET_PROPERTY:kernel_config_target,TOPLEVELTYPES>,;--toplevel;>"
)
list(APPEND deps "${UMM_TYPES}")
GenThyBFTarget(
"${args}"
"${target_name}"
"${target_file}"
"${pbf_path}"
"${pbf_target}"
"${prunes}"
"${deps}"
)
endfunction(GenProofsBFTarget)
# config_option(cmake_option_name c_config_name doc DEFAULT default [DEPENDS deps] [DEFAULT_DISABLE default_disabled])
# Defines a toggleable configuration option that will be present in the cache and the
# cmake-gui
# optionname is the name of the cache variable that can be used directly in cmake scripts
# to get the value of the option
# configname is the name (prefixed with CONFIG_) that will appear in generated
# C configuration headers
# DEFAULT is the default value of the config that it should initially be set to
# doc Help string to explain the option in the cmake-gui
# An additional DEPENDS arguments may be passed, which is a list of conditions to evaluate and if true,
# the option will exist. If the option doesn't exist it will be set to DEFAULT_DISABLED, or if
# that wasn't provided then just DEFAULT
# If the option is true it adds to the global configure_string variable (see add_config_library)
function(config_option optionname configname doc)
cmake_parse_arguments(PARSE_ARGV 3 "CONFIG" "" "DEPENDS;DEFAULT_DISABLED;DEFAULT" "")
if(NOT "${CONFIG_UNPARSED_ARGUMENTS}" STREQUAL "")
message(FATAL_ERROR "Unknown arguments to config_option")
endif()
if("${CONFIG_DEFAULT_DISABLED}" STREQUAL "")
set(CONFIG_DEFAULT_DISABLED "${CONFIG_DEFAULT}")
endif()
set(valid ON)
if(NOT "${CONFIG_DEPENDS}" STREQUAL "")
# Check the passed in dependencies. This loop and logic is inspired by the
# actual cmake_dependent_option code
foreach(test ${CONFIG_DEPENDS})
string(
REGEX
REPLACE
" +"
";"
test
"${test}"
)
if(NOT (${test}))
set(valid OFF)
break()
endif()
endforeach()
endif()
if(valid)
# Check for an existing value, and set the option to that, otherwise use the default
# Also reset the default if we switched from disabled to enabled
if((DEFINED ${optionname}) AND (NOT DEFINED ${optionname}_DISABLED))
set(${optionname} "${${optionname}}" CACHE BOOL "${doc}" FORCE)
else()
set(${optionname} "${CONFIG_DEFAULT}" CACHE BOOL "${doc}" FORCE)
unset(${optionname}_DISABLED CACHE)
endif()
else()
set(${optionname} "${CONFIG_DEFAULT_DISABLED}" CACHE INTERNAL "${doc}" FORCE)
set(${optionname}_DISABLED TRUE CACHE INTERNAL "" FORCE)
endif()
set(local_config_string "${configure_string}")
if(${optionname})
list(APPEND local_config_string "#define CONFIG_${configname} 1")
endif()
set(configure_string "${local_config_string}" PARENT_SCOPE)
endfunction(config_option)
# Set a configuration option to a particular value. This value will not appear in
# the cmake-gui, but will produce an internal cmake cache variable and generated
# configuration headers.
# If the option is not OFF it adds to the global configure_string variable (see add_config_library)
macro(config_set optionname configname value)
set(${optionname} "${value}" CACHE INTERNAL "" FORCE)
if("${value}" STREQUAL "ON")
list(APPEND configure_string "#define CONFIG_${configname} 1")
elseif("${value}" STREQUAL "OFF")
else()
list(APPEND configure_string "#define CONFIG_${configname} ${value}")
endif()
endmacro(config_set)
# config_cmake_string(cmake_option_name c_config_name doc DEFAULT default [DEPENDS dep]
# [DEFAULT_DISABLED default_disabled] [UNDEF_DISABLED] [QUOTE]
# Defines a configuration option that is a user configurable string. Most parameters
# are the same as config_option
# UNQUOTE if specified says this is something with more semantics like a number or identifier
# and should not be quoted in the output
# [UNDEF_DISABLED] can be specified to explicitly disable generation of any output value when
# the configuration dependencies are unmet
# Adds to the global configure_string variable (see add_config_library)
function(config_string optionname configname doc)
cmake_parse_arguments(
PARSE_ARGV
3
"CONFIG"
"UNQUOTE;UNDEF_DISABLED"
"DEPENDS;DEFAULT_DISABLED;DEFAULT"
""
)
if(NOT "${CONFIG_UNPARSED_ARGUMENTS}" STREQUAL "")
message(FATAL_ERROR "Unknown arguments to config_option: ${CONFIG_UNPARSED_ARGUMENTS}")
endif()
if("${CONFIG_DEFAULT}" STREQUAL "")
message(FATAL_ERROR "No default specified for ${config_option}")
endif()
if("${CONFIG_DEFAULT_DISABLED}" STREQUAL "")
set(CONFIG_DEFAULT_DISABLED "${CONFIG_DEFAULT}")
endif()
set(valid ON)
set(local_config_string "${configure_string}")
if(NOT "${CONFIG_DEPENDS}" STREQUAL "")
# Check the passed in dependencies. This loop and logic is inspired by the
# actual cmake_dependent_option code
foreach(test ${CONFIG_DEPENDS})
string(
REGEX
REPLACE
" +"
";"
test
"${test}"
)
if(NOT (${test}))
set(valid OFF)
break()
endif()
endforeach()
endif()
if(CONFIG_UNQUOTE)
set(quote "")
else()
set(quote "\"")
endif()
if(valid)
# See if we transitioned from disabled to enabled. We do this by having an
# _UNAVAILABLE variable. We want to ensure that if the option previously had
# unmet conditions that we reset its value to 'default'. This is needed
# because whilst the option had unmet conditions it still potentially had
# a value in the form of the optional disabled_value
set(force "")
if(${optionname}_UNAVAILABLE)
set(force "FORCE")
unset(${optionname}_UNAVAILABLE CACHE)
endif()
set(${optionname} "${CONFIG_DEFAULT}" CACHE STRING "${doc}" ${force})
list(
APPEND
local_config_string "#define CONFIG_${configname} ${quote}@${optionname}@${quote}"
)
else()
if(CONFIG_UNDEF_DISABLED)
unset(${optionname} CACHE)
else()
# Forcively change the value to its disabled_value
set(${optionname} "${CONFIG_DEFAULT_DISABLED}" CACHE INTERNAL "" FORCE)
list(
APPEND
local_config_string
"#define CONFIG_${configname} ${quote}@${optionname}@${quote}"
)
endif()
# Sset _UNAVAILABLE so we can detect when the option because enabled again
set(${optionname}_UNAVAILABLE ON CACHE INTERNAL "" FORCE)
endif()
set(configure_string "${local_config_string}" PARENT_SCOPE)
endfunction(config_string)
# Defines a multi choice / select configuration option
# optionname is the name of the cache variable that can be used directly in cmake scripts
# to get the value of the option
# configname is the name (prefixed with CONFIG_) that will appear in generated
# C configuration headers and is set to the string of the selected config
# doc Help string to explain the option in the cmake-gui
# Then any number of additional arguments may be supplied each describing one of the potential
# configuration choices. Each additional argument is a list of (option_value, option_cache,
# option_config, [condition]...)
# option_value is the string that represents this option. this is what the user will see
# in the cmake-gui and what configname will get defined to if this option is selected
# option_cache is like optionname and is set to ON when this option is selected and OFF
# if it is not
# condition may be repeated as many times and all conditions must be true for this choice
# to appear in the list
# If no valid choices are given (either because none are given or the ones that were given
# did not have their conditions met) then this option will be disabled and not appear in
# the cmake-gui
# Adds to the global configure_string variable (see add_config_library)
function(config_choice optionname configname doc)
# Cannot use ARGN because each argument itself is a list
math(EXPR limit "${ARGC} - 1")
set(local_config_string "${configure_string}")
# force_default represents whether we need to force a new value or not. We would need
# to force a new value for example if we detect that the current selected choice is
# no longer (due to conditions) a valid choice
set(force_default "")
# Used to track the first time we see a valid enabled choice. The first valid choice
# becomes the default and if we never find a valid choice then we know to disable this config
set(first ON)
# This tracks whether or not the current selected choice is one of the ones that we
# have been passed. If we fail to find the currently selected choice then, similar to
# if the current choice is invalid to do an unment condition, we must switch to some
# valid default
set(found_current OFF)
foreach(i RANGE 3 ${limit})
set(option "${ARGV${i}}")
# Extract the constant parts of the choice information and just leave any
# conditional information
list(GET option 0 option_value)
list(GET option 1 option_cache)
list(GET option 2 option_config)
list(
REMOVE_AT
option
0
1
2
)
# Construct a list of all of our options
list(APPEND all_strings "${option_value}")
# By default we assume is valid, we may change our mind after checking dependencies
# (if there are any). This loop is again based off the one in cmake_dependent_option
set(valid ON)
foreach(truth IN LISTS option)
string(
REGEX
REPLACE
" +"
";"
truth
"${truth}"
)
if(NOT (${truth}))
# This choice isn't valid due to unmet conditions so we must check if we have
# currently selected this choice. If so trigger the force_default
if("${${optionname}}" STREQUAL "${option_value}")
set(force_default "FORCE")
endif()
set(valid OFF)
endif()
endforeach()
if(valid)
# Is a valid option, add to the strings list
list(APPEND strings "${option_value}")
if(first)
set(first OFF)
set(first_cache "${option_cache}")
set(first_config "${option_config}")
# Use the first valid option we find as the default. This default is will be
# used if there is no current value, or for some reason we need to override
# the current value (see force_default above)
set(default "${option_value}")
endif()
# Check if this option is the one that is currently set
if("${${optionname}}" STREQUAL "${option_value}")
set(${option_cache} ON CACHE INTERNAL "" FORCE)
list(APPEND local_config_string "#define CONFIG_${option_config} 1")
set(found_current ON)
else()
set(${option_cache} OFF CACHE INTERNAL "" FORCE)
endif()
else()
# Remove this config as it's not valid
unset(${option_cache} CACHE)
endif()
endforeach()
if(NOT found_current)
# Currently selected option wasn't found so reset to a default that we know is valid
set(force_default "FORCE")
endif()
if(first)
# None of the choices were valid. Remove this option so its not visible
unset(${optionname} CACHE)
else()
list(APPEND local_config_string "#define CONFIG_${configname} @${optionname}@")
set(configure_string "${local_config_string}" PARENT_SCOPE)
set(${optionname} "${default}" CACHE STRING "${doc}" ${force_default})
set_property(CACHE ${optionname} PROPERTY STRINGS ${strings})
if(NOT found_current)
# The option is actually enabled, but we didn't enable the correct
# choice earlier, since we didn't know we were going to revert to
# the default. So add the option setting here
set(${first_cache} ON CACHE INTERNAL "" FORCE)
list(APPEND local_config_string "#define CONFIG_${first_config} 1")
endif()
endif()
# Save all possible options to an internal value. This is to allow enumerating the options elsewhere.
# We create a new variable because cmake doesn't support arbitrary properties on cache variables.
set(${optionname}_all_strings ${all_strings} CACHE INTERNAL "" FORCE)
set(configure_string "${local_config_string}" PARENT_SCOPE)
endfunction(config_choice)
# Defines a target for a 'configuration' library, which generates a header based
# upon current state of cache/variables and a provided template string. Additionally
# the generated library gets added to a known global list of 'configuration' libraries
# This list can be used if someone wants all the configurations
# Whilst this function takes an explicit configure_template, generally this will always
# be '${configure_string}' as that is the global variable automatically appended to
# by the config_ helper macros and functions above
# This generates a library that can be linked against with
# target_link_library(<target> ${prefix}_Config)
# Which will allow you to do #include <${prefix}/gen_config.h>
function(add_config_library prefix configure_template)
set(config_dir "${CMAKE_CURRENT_BINARY_DIR}/gen_config")
set(config_file "${config_dir}/${prefix}/gen_config.h")
string(CONFIGURE "${configure_template}" config_header_contents)
# Turn the list of configurations into a valid C file of different lines
string(
REPLACE
";"
"\n"
config_header_contents
"${config_header_contents}"
)
file(GENERATE OUTPUT "${config_file}" CONTENT "${config_header_contents}")
add_custom_target(${prefix}_Gen DEPENDS "${config_file}")
add_library(${prefix}_Config INTERFACE)
target_include_directories(${prefix}_Config INTERFACE "${config_dir}")
add_dependencies(${prefix}_Config ${prefix}_Gen ${config_file})
set_property(GLOBAL APPEND PROPERTY CONFIG_LIBRARIES "${prefix}")
# Set a property on the library that is a list of the files we generated. This
# allows custom build commands to easily get a file dependency list so they can
# 'depend' upon this target easily
set_property(TARGET ${prefix}_Gen APPEND PROPERTY GENERATED_FILES "${config_file}")
endfunction(add_config_library)
macro(get_generated_files output target)
get_property(${output} TARGET ${target} PROPERTY GENERATED_FILES)
endmacro(get_generated_files)
# This rule tries to emulate an 'autoconf' header. autoconf generated headers
# were previously used as configuration, so this rule provides a way for previous
# applications and libraries to build without modification. The config_list
# is a list of 'prefix' values that have been pssed to add_config_library
# This generates a library with ${targetname} that when linked against
# will allow code to simply #include <autoconf.h>
function(generate_autoconf targetname config_list)
set(link_list "")
set(gen_list "")
set(include_list "#ifndef AUTOCONF_${targetname}_H" "#define AUTOCONF_${targetname}_H")
foreach(config IN LISTS config_list)
list(APPEND link_list "${config}_Config")
get_generated_files(gens ${config}_Gen)
list(APPEND gen_list ${gens})
list(APPEND include_list "#include <${config}/gen_config.h>")
endforeach()
list(APPEND include_list "#endif")
set(config_dir "${CMAKE_CURRENT_BINARY_DIR}/autoconf")
set(config_file "${config_dir}/autoconf.h")
string(
REPLACE
";"
"\n"
config_header_contents
"#define AUTOCONF_INCLUDED;${include_list}"
)
file(GENERATE OUTPUT "${config_file}" CONTENT "${config_header_contents}")
add_custom_target(${targetname}_Gen DEPENDS "${config_file}")
add_library(${targetname} INTERFACE)
target_link_libraries(${targetname} INTERFACE ${link_list})
target_include_directories(${targetname} INTERFACE "${config_dir}")
add_dependencies(${targetname} ${targetname}_Gen ${config_file})
# Set our GENERATED_FILES property to include the GENERATED_FILES of all of our input
# configurations, as well as the files we generated
set_property(
TARGET ${targetname}_Gen
APPEND
PROPERTY GENERATED_FILES "${config_file}" ${gen_list}
)
endfunction(generate_autoconf)
# Macro that allows for appending to a specified list only if all the supplied conditions are true
macro(list_append_if list dep)
set(list_append_local_list ${${list}})
set(list_append_valid ON)
foreach(truth IN ITEMS ${dep})
string(
REGEX
REPLACE
" +"
";"
truth
"${truth}"
)
if(NOT (${truth}))
set(list_append_valid OFF)
break()
endif()
endforeach()
if(list_append_valid)
list(APPEND list_append_local_list ${ARGN})
endif()
set(${list} ${list_append_local_list} PARENT_SCOPE)
endmacro(list_append_if)
macro(kernel_platforms_list target)
list(APPEND ${target} ${KernelRiscVPlatform_all_strings})
list(APPEND ${target} ${KernelX86Sel4Arch_all_strings})
list(APPEND ${target} ${KernelARMPlatform_all_strings})
endmacro(kernel_platforms_list)
macro(kernel_platforms_string target)
set(plat_names "")
kernel_platforms_list(plat_names)
string(
REPLACE
";"
"\n "
${target}
"${plat_names}"
)
endmacro(kernel_platforms_string)
# Checks if a file is older than its dependencies
# Will set `stale` to TRUE if outfile doesn't exist,
# or if outfile is older than any file in `deps_list`.
# Will also set `stale` to TRUE if the arguments given to this macro
# change compared to the previous invocation.
# stale: A variable to overwrite with TRUE or FALSE
# outfile: A value that is a valid file path
# deps_list: A variable that holds a list of file paths
# arg_cache: A variable that holds a file to store arguments to
# e.g:
# set(dts_list "filea" "fileb" "filec")
# set(KernelDTBPath "${CMAKE_CURRENT_BINARY_DIR}/kernel.dtb")
# check_outfile_stale(regen ${KernelDTBPath} dts_list ${CMAKE_CURRENT_BINARY_DIR}/dts.cmd
# if (regen)
# regen_file(${KernelDTBPath})
# endif()
#
# The above call will set regen to TRUE if the file referred
# to by KernelDTBPath doesn't exist, or is older than any files
# in KernelDTSIntermediate or if regen, ${KernelDTBPath} and dts_list resolve to different files.
macro(check_outfile_stale stale outfile deps_list arg_cache)
set(_outfile_command "${stale} ${outfile} ${${deps_list}}")
if(NOT EXISTS "${arg_cache}")
set(_prev_command "")
else()
file(READ "${arg_cache}" _prev_command)
endif()
if(NOT "${_outfile_command}" STREQUAL "${_prev_command}")
set(${stale} TRUE)
else()
set(${stale} FALSE)
endif()
if(EXISTS ${outfile} AND NOT ${stale})
set(${stale} FALSE)
foreach(dep IN LISTS ${deps_list})
if("${dep}" IS_NEWER_THAN "${outfile}")
set(${stale} TRUE)
break()
endif()
endforeach()
else()
set(${stale} TRUE)
endif()
if(${stale})
file(WRITE "${arg_cache}" "${_outfile_command}")
endif()
endmacro()
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