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zephyr/cmake/extensions.cmake
Sebastian Bøe 96e7df466a cmake: Give zephyr_library_* flags precedence over zephyr_* flags 
This fixes https://github.com/zephyrproject-rtos/zephyr/issues/5097.

The desired behaviour is that when a flag that is given through the
zephyr_* API conflicts with the zephyr_library_* API then precedence
will be given to the zephyr_library_* API. In other words, local
configuration overrides global configuration.

We choose to rely upon the compiler for sane behaviour when flags are
in conflict. Compilers generally give precedence to flags given late
on the command line. So to ensure that zephyr_library_* flags are
placed late on the command line we create a dummy interface library
and link with it to obtain the flags.

Other options were considered, source file properties would also have
higher priority. But that would have required some kind of
post-processing stage that applies all the source file properties.

Linking with a dummy interface library will place flags later on the
command line than the the flags from zephyr_interface because
zephyr_interface will be the first interface library that flags are
taken from.

Signed-off-by: Sebastian Boe <sebastian.boe@nordicsemi.no>
2017-11-23 09:18:24 -05:00

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include(CheckCCompilerFlag)
########################################################
# Table of contents
########################################################
# 1. Zephyr-aware extensions
# 1.1. zephyr_*
# 1.2. zephyr_library_*
# 1.3. generate_inc_*
# 2. Kconfig-aware extensions
# 2.1 *_if_kconfig
# 2.2 Misc
# 3. CMake-generic extensions
# 3.1. *_ifdef
# 3.2. *_ifndef
# 3.3. *_option compiler compatibility checks
# 3.4. Debugging CMake
########################################################
# 1. Zephyr-aware extensions
########################################################
# 1.1. zephyr_*
#
# The following methods are for modifying the CMake library[0] called
# "zephyr". zephyr is a catchall CMake library for source files that
# can be built purely with the include paths, defines, and other
# compiler flags that all zephyr source files use.
# [0] https://cmake.org/cmake/help/latest/manual/cmake-buildsystem.7.html
#
# Example usage:
# zephyr_sources(
# random_esp32.c
# utils.c
# )
#
# Is short for:
# target_sources(zephyr PRIVATE
# ${CMAKE_CURRENT_SOURCE_DIR}/random_esp32.c
# ${CMAKE_CURRENT_SOURCE_DIR}/utils.c
# )
# https://cmake.org/cmake/help/latest/command/target_sources.html
function(zephyr_sources)
foreach(arg ${ARGV})
if(IS_ABSOLUTE ${arg})
set(path ${arg})
else()
set(path ${CMAKE_CURRENT_SOURCE_DIR}/${arg})
endif()
if(IS_DIRECTORY ${path})
message(FATAL_ERROR "zephyr_sources() was called on a directory")
endif()
target_sources(zephyr PRIVATE ${path})
endforeach()
endfunction()
# https://cmake.org/cmake/help/latest/command/target_include_directories.html
function(zephyr_include_directories)
foreach(arg ${ARGV})
if(IS_ABSOLUTE ${arg})
set(path ${arg})
else()
set(path ${CMAKE_CURRENT_SOURCE_DIR}/${arg})
endif()
target_include_directories(zephyr_interface INTERFACE ${path})
endforeach()
endfunction()
# https://cmake.org/cmake/help/latest/command/target_include_directories.html
function(zephyr_system_include_directories)
foreach(arg ${ARGV})
if(IS_ABSOLUTE ${arg})
set(path ${arg})
else()
set(path ${CMAKE_CURRENT_SOURCE_DIR}/${arg})
endif()
target_include_directories(zephyr_interface SYSTEM INTERFACE ${path})
endforeach()
endfunction()
# https://cmake.org/cmake/help/latest/command/target_compile_definitions.html
function(zephyr_compile_definitions)
target_compile_definitions(zephyr_interface INTERFACE ${ARGV})
endfunction()
# https://cmake.org/cmake/help/latest/command/target_compile_options.html
function(zephyr_compile_options)
target_compile_options(zephyr_interface INTERFACE ${ARGV})
endfunction()
# https://cmake.org/cmake/help/latest/command/target_link_libraries.html
function(zephyr_link_libraries)
target_link_libraries(zephyr_interface INTERFACE ${ARGV})
endfunction()
# See this file section 3.1. target_cc_option
function(zephyr_cc_option)
foreach(arg ${ARGV})
target_cc_option(zephyr_interface INTERFACE ${arg})
endforeach()
endfunction()
function(zephyr_cc_option_fallback option1 option2)
target_cc_option_fallback(zephyr_interface INTERFACE ${option1} ${option2})
endfunction()
function(zephyr_ld_options)
target_ld_options(zephyr_interface INTERFACE ${ARGV})
endfunction()
# Getter functions for extracting build information from
# zephyr_interface. Returning lists, and strings is supported, as is
# requesting specific categories of build information (defines,
# includes, options).
#
# The naming convention follows:
# zephyr_get_${build_information}${format}(x)
# Where
# the argument 'x' is written with the result
# and
# ${build_information} can be one of
# - include_directories # -I directories
# - system_include_directories # -isystem directories
# - compile_definitions # -D'efines
# - compile_options # misc. compiler flags
# and
# ${format} can be
# the empty string '', signifying that it should be returned as a list
# _as_string signifying that it should be returned as a string
#
# e.g.
# zephyr_get_include_directories(x)
# writes "-Isome_dir;-Isome/other/dir" to x
# Utility macro used by the below macros.
macro(get_property_and_add_prefix result target property prefix)
get_property(target_property TARGET ${target} PROPERTY ${property})
foreach(x ${target_property})
list(APPEND ${result} ${prefix}${x})
endforeach()
endmacro()
macro(zephyr_get_include_directories i)
get_property_and_add_prefix(${i} zephyr_interface INTERFACE_INCLUDE_DIRECTORIES -I)
endmacro()
macro(zephyr_get_system_include_directories i)
get_property_and_add_prefix(${i} zephyr_interface INTERFACE_SYSTEM_INCLUDE_DIRECTORIES -isystem)
endmacro()
macro(zephyr_get_compile_definitions i)
get_property_and_add_prefix(${i} zephyr_interface INTERFACE_COMPILE_DEFINITIONS -D)
endmacro()
macro(zephyr_get_compile_options i)
get_property(${i} TARGET zephyr_interface PROPERTY INTERFACE_COMPILE_OPTIONS)
endmacro()
macro(zephyr_get_include_directories_as_string i)
zephyr_get_include_directories(${i})
string(REPLACE ";" " " ${i} ${${i}})
string(REPLACE "-I" " -I" ${i} ${${i}})
endmacro()
macro(zephyr_get_system_include_directories_as_string i)
get_property_and_add_prefix(${i} zephyr_interface INTERFACE_SYSTEM_INCLUDE_DIRECTORIES -isystem)
string(REPLACE ";" " " ${i} ${${i}})
string(REPLACE "-isystem" " -isystem" ${i} ${${i}})
endmacro()
macro(zephyr_get_compile_definitions_as_string i)
get_property_and_add_prefix(${i} zephyr_interface INTERFACE_COMPILE_DEFINITIONS -D)
string(REPLACE ";" " " ${i} ${${i}})
string(REPLACE "-D" " -D" ${i} ${${i}})
endmacro()
macro(zephyr_get_compile_options_as_string i)
zephyr_get_compile_options(j)
foreach(__opt__ ${j})
if(__opt__ MATCHES "<COMPILE_LANGUAGE:")
# TODO: Support COMPILE_LANGUAGE generator expressions
continue()
endif()
set(${i} "${${i}} ${__opt__}")
endforeach()
endmacro()
# 1.3 generate_inc_*
# These functions are useful if there is a need to generate a file
# that can be included into the application at build time. The file
# can also be compressed automatically when embedding it.
#
# See tests/application_development/gen_inc_file for an example of
# usage.
function(generate_inc_file
source_file # The source file to be converted to hex
generated_file # The generated file
)
add_custom_command(
OUTPUT ${generated_file}
COMMAND
${PYTHON_EXECUTABLE}
$ENV{ZEPHYR_BASE}/scripts/file2hex.py
${ARGN} # Extra arguments are passed to file2hex.py
--file ${source_file}
> ${generated_file} # Does pipe redirection work on Windows?
DEPENDS ${source_file}
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
)
endfunction()
function(generate_inc_file_for_target
target # The cmake target that depends on the generated file
source_file # The source file to be converted to hex
generated_file # The generated file
# Any additional arguments are passed on to file2hex.py
)
generate_inc_file(${source_file} ${generated_file} ${ARGN})
# Ensure 'generated_file' is generated before 'target' by creating a
# 'custom_target' for it and setting up a dependency between the two
# targets
# But first create a unique name for the custom target
# Replace / with _ (driver/serial => driver_serial) and . with _
set(generated_target_name ${generated_file})
string(REPLACE "/" "_" generated_target_name ${generated_target_name})
string(REPLACE "." "_" generated_target_name ${generated_target_name})
add_custom_target(${generated_target_name} DEPENDS ${generated_file})
add_dependencies(${target} ${generated_target_name})
endfunction()
# 1.2 zephyr_library_*
#
# Zephyr libraries use CMake's library concept and a set of
# assumptions about how zephyr code is organized to cut down on
# boilerplate code.
#
# A Zephyr library can be constructed by the function zephyr_library
# or zephyr_library_named. The constructors create a CMake library
# with a name accessible through the variable ZEPHYR_CURRENT_LIBRARY.
#
# The variable ZEPHYR_CURRENT_LIBRARY should seldomly be needed since
# the zephyr libraries have methods that modify the libraries. These
# methods have the signature: zephyr_library_<target-function>
#
# The methods are wrappers around the CMake target_* functions. See
# https://cmake.org/cmake/help/latest/manual/cmake-commands.7.html for
# documentation on the underlying target_* functions.
#
# The methods modify the CMake target_* API to reduce boilerplate;
# PRIVATE is assumed
# The target is assumed to be ZEPHYR_CURRENT_LIBRARY
#
# When a flag that is given through the zephyr_* API conflicts with
# the zephyr_library_* API then precedence will be given to the
# zephyr_library_* API. In other words, local configuration overrides
# global configuration.
# Constructor with a directory-inferred name
macro(zephyr_library)
zephyr_library_get_current_dir_lib_name(lib_name)
zephyr_library_named(${lib_name})
endmacro()
# Determines what the current directory's lib name would be and writes
# it to the argument "lib_name"
macro(zephyr_library_get_current_dir_lib_name lib_name)
# Remove the prefix (/home/sebo/zephyr/driver/serial/CMakeLists.txt => driver/serial/CMakeLists.txt)
file(RELATIVE_PATH name $ENV{ZEPHYR_BASE} ${CMAKE_CURRENT_LIST_FILE})
# Remove the filename (driver/serial/CMakeLists.txt => driver/serial)
get_filename_component(name ${name} DIRECTORY)
# Replace / with __ (driver/serial => driver__serial)
string(REGEX REPLACE "/" "__" name ${name})
set(${lib_name} ${name})
endmacro()
# Constructor with an explicitly given name.
macro(zephyr_library_named name)
# This is a macro because we need add_library() to be executed
# within the scope of the caller.
set(ZEPHYR_CURRENT_LIBRARY ${name})
add_library(${name} STATIC "")
zephyr_append_cmake_library(${name})
target_link_libraries(${name} zephyr_interface)
endmacro()
function(zephyr_link_interface interface)
target_link_libraries(interface INTERFACE zephyr_interface)
endfunction()
#
# zephyr_library versions of normal CMake target_<func> functions
#
function(zephyr_library_sources source)
target_sources(${ZEPHYR_CURRENT_LIBRARY} PRIVATE ${source} ${ARGN})
endfunction()
function(zephyr_library_include_directories)
target_include_directories(${ZEPHYR_CURRENT_LIBRARY} PRIVATE ${ARGN})
endfunction()
function(zephyr_library_link_libraries item)
target_link_libraries(${ZEPHYR_CURRENT_LIBRARY} ${item} ${ARGN})
endfunction()
function(zephyr_library_compile_definitions item)
target_compile_definitions(${ZEPHYR_CURRENT_LIBRARY} PRIVATE ${item} ${ARGN})
endfunction()
function(zephyr_library_compile_options item)
# The compiler is relied upon for sane behaviour when flags are in
# conflict. Compilers generally give precedence to flags given late
# on the command line. So to ensure that zephyr_library_* flags are
# placed late on the command line we create a dummy interface
# library and link with it to obtain the flags.
#
# Linking with a dummy interface library will place flags later on
# the command line than the the flags from zephyr_interface because
# zephyr_interface will be the first interface library that flags
# are taken from.
string(RANDOM random)
set(lib_name options_interface_lib_${random})
add_library( ${lib_name} INTERFACE)
target_compile_options(${lib_name} INTERFACE ${item} ${ARGN})
target_link_libraries(${ZEPHYR_CURRENT_LIBRARY} ${lib_name})
endfunction()
function(zephyr_library_cc_option)
foreach(option ${ARGV})
string(MAKE_C_IDENTIFIER check${option} check)
check_c_compiler_flag(${option} ${check})
if(${check})
zephyr_library_compile_options(${option})
endif()
endforeach()
endfunction()
# Add the existing CMake library 'library' to the global list of
# Zephyr CMake libraries. This is done automatically by the
# constructor but must called explicitly on CMake libraries that do
# not use a zephyr library constructor, but have source files that
# need to be included in the build.
function(zephyr_append_cmake_library library)
set_property(GLOBAL APPEND PROPERTY ZEPHYR_LIBS ${library})
endfunction()
########################################################
# 2. Kconfig-aware extensions
########################################################
#
# Kconfig is a configuration language developed for the Linux
# kernel. The below functions integrate CMake with Kconfig.
#
# 2.1 *_if_kconfig
#
# Functions for conditionally including directories and source files
# that have matching KConfig values.
#
# zephyr_library_sources_if_kconfig(fft.c)
# is the same as
# zephyr_library_sources_ifdef(CONFIG_FFT fft.c)
#
# add_subdirectory_if_kconfig(serial)
# is the same as
# add_subdirectory_ifdef(CONFIG_SERIAL serial)
function(add_subdirectory_if_kconfig dir)
string(TOUPPER config_${dir} UPPER_CASE_CONFIG)
add_subdirectory_ifdef(${UPPER_CASE_CONFIG} ${dir})
endfunction()
function(target_sources_if_kconfig target scope item)
get_filename_component(item_basename ${item} NAME_WE)
string(TOUPPER CONFIG_${item_basename} UPPER_CASE_CONFIG)
target_sources_ifdef(${UPPER_CASE_CONFIG} ${target} ${scope} ${item})
endfunction()
function(zephyr_library_sources_if_kconfig item)
get_filename_component(item_basename ${item} NAME_WE)
string(TOUPPER CONFIG_${item_basename} UPPER_CASE_CONFIG)
zephyr_library_sources_ifdef(${UPPER_CASE_CONFIG} ${item})
endfunction()
function(zephyr_sources_if_kconfig item)
get_filename_component(item_basename ${item} NAME_WE)
string(TOUPPER CONFIG_${item_basename} UPPER_CASE_CONFIG)
zephyr_sources_ifdef(${UPPER_CASE_CONFIG} ${item})
endfunction()
# 2.2 Misc
#
# Parse a KConfig formatted file (typically named *.config) and
# introduce all the CONF_ variables into the CMake namespace
function(import_kconfig config_file)
# Parse the lines prefixed with CONFIG_ in ${config_file}
file(
STRINGS
${config_file}
DOT_CONFIG_LIST
REGEX "^CONFIG_"
)
foreach (CONFIG ${DOT_CONFIG_LIST})
# CONFIG looks like: CONFIG_NET_BUF=y
# Match the first part, the variable name
string(REGEX MATCH "[^=]+" CONF_VARIABLE_NAME ${CONFIG})
# Match the second part, variable value
string(REGEX MATCH "=(.+$)" CONF_VARIABLE_VALUE ${CONFIG})
# The variable name match we just did included the '=' symbol. To just get the
# part on the RHS we use match group 1
set(CONF_VARIABLE_VALUE ${CMAKE_MATCH_1})
if("${CONF_VARIABLE_VALUE}" MATCHES "^\"(.*)\"$") # Is surrounded by quotes
set(CONF_VARIABLE_VALUE ${CMAKE_MATCH_1})
endif()
set("${CONF_VARIABLE_NAME}" "${CONF_VARIABLE_VALUE}" PARENT_SCOPE)
endforeach()
endfunction()
########################################################
# 3. CMake-generic extensions
########################################################
#
# These functions extend the CMake API in a way that is not particular
# to Zephyr. Primarily they work around limitations in the CMake
# language to allow cleaner build scripts.
# 3.1. *_ifdef
#
# Functions for conditionally executing CMake functions with oneliners
# e.g.
#
# if(CONFIG_FFT)
# zephyr_library_source(
# fft_32.c
# fft_utils.c
# )
# endif()
#
# Becomes
#
# zephyr_source_ifdef(
# CONFIG_FFT
# fft_32.c
# fft_utils.c
# )
#
# More Generally
# "<function-name>_ifdef(CONDITION args)"
# Becomes
# """
# if(CONDITION)
# <function-name>(args)
# endif()
# """
#
# ifdef functions are added on an as-need basis. See
# https://cmake.org/cmake/help/latest/manual/cmake-commands.7.html for
# a list of available functions.
function(add_subdirectory_ifdef feature_toggle dir)
if(${${feature_toggle}})
add_subdirectory(${dir})
endif()
endfunction()
function(target_sources_ifdef feature_toggle target scope item)
if(${${feature_toggle}})
target_sources(${target} ${scope} ${item} ${ARGN})
endif()
endfunction()
function(target_compile_definitions_ifdef feature_toggle target scope item)
if(${${feature_toggle}})
target_compile_definitions(${target} ${scope} ${item} ${ARGN})
endif()
endfunction()
function(target_include_directories_ifdef feature_toggle target scope item)
if(${${feature_toggle}})
target_include_directories(${target} ${scope} ${item} ${ARGN})
endif()
endfunction()
function(target_link_libraries_ifdef feature_toggle target item)
if(${${feature_toggle}})
target_link_libraries(${target} ${item} ${ARGN})
endif()
endfunction()
function(add_compile_option_ifdef feature_toggle option)
if(${${feature_toggle}})
add_compile_options(${option})
endif()
endfunction()
function(target_compile_option_ifdef feature_toggle target scope option)
if(${feature_toggle})
target_compile_options(${target} ${scope} ${option})
endif()
endfunction()
function(target_cc_option_ifdef feature_toggle target scope option)
if(${feature_toggle})
target_cc_option(${target} ${scope} ${option})
endif()
endfunction()
function(zephyr_library_sources_ifdef feature_toggle source)
if(${${feature_toggle}})
zephyr_library_sources(${source} ${ARGN})
endif()
endfunction()
function(zephyr_sources_ifdef feature_toggle)
if(${${feature_toggle}})
zephyr_sources(${ARGN})
endif()
endfunction()
function(zephyr_sources_ifndef feature_toggle)
if(NOT ${feature_toggle})
zephyr_sources(${ARGN})
endif()
endfunction()
function(zephyr_cc_option_ifdef feature_toggle)
if(${${feature_toggle}})
zephyr_cc_option(${ARGN})
endif()
endfunction()
function(zephyr_link_libraries_ifdef feature_toggle)
if(${${feature_toggle}})
zephyr_link_libraries(${ARGN})
endif()
endfunction()
function(zephyr_compile_options_ifdef feature_toggle)
if(${${feature_toggle}})
zephyr_compile_options(${ARGN})
endif()
endfunction()
function(zephyr_compile_definitions_ifdef feature_toggle)
if(${${feature_toggle}})
zephyr_compile_definitions(${ARGN})
endif()
endfunction()
function(zephyr_include_directories_ifdef feature_toggle)
if(${${feature_toggle}})
zephyr_include_directories(${ARGN})
endif()
endfunction()
function(zephyr_library_compile_definitions_ifdef feature_toggle item)
if(${${feature_toggle}})
zephyr_library_compile_definitions(${item} ${ARGN})
endif()
endfunction()
function(zephyr_library_compile_options_ifdef feature_toggle item)
if(${${feature_toggle}})
zephyr_library_compile_options(${item} ${ARGN})
endif()
endfunction()
function(zephyr_link_interface_ifdef feature_toggle interface)
if(${${feature_toggle}})
target_link_libraries(${interface} INTERFACE zephyr_interface)
endif()
endfunction()
function(zephyr_library_link_libraries_ifdef feature_toggle item)
if(${${feature_toggle}})
zephyr_library_link_libraries(${item})
endif()
endfunction()
macro(list_append_ifdef feature_toggle list)
if(${${feature_toggle}})
list(APPEND ${list} ${ARGN})
endif()
endmacro()
# 3.2. *_ifndef
# See 3.1 *_ifdef
function(set_ifndef variable value)
if(NOT ${variable})
set(${variable} ${value} PARENT_SCOPE)
endif()
endfunction()
function(target_cc_option_ifndef feature_toggle target scope option)
if(NOT ${feature_toggle})
target_cc_option(${target} ${scope} ${option})
endif()
endfunction()
function(zephyr_cc_option_ifndef feature_toggle)
if(NOT ${feature_toggle})
zephyr_cc_option(${ARGN})
endif()
endfunction()
function(zephyr_compile_options_ifndef feature_toggle)
if(NOT ${feature_toggle})
zephyr_compile_options(${ARGN})
endif()
endfunction()
# 3.2. *_option Compiler-compatibility checks
#
# Utility functions for silently omitting compiler flags when the
# compiler lacks support. *_cc_option was ported from KBuild, see
# cc-option in
# https://www.kernel.org/doc/Documentation/kbuild/makefiles.txt
#
function(target_cc_option target scope option)
string(MAKE_C_IDENTIFIER check${option} check)
check_c_compiler_flag(${option} ${check})
target_compile_option_ifdef(${check} ${target} ${scope} ${option})
endfunction()
# Support an optional second option for when the first option is
# not supported.
function(target_cc_option_fallback target scope option1 option2)
string(MAKE_C_IDENTIFIER check${option1} check)
check_c_compiler_flag(${option1} ${check})
if(${check})
target_compile_options(${target} ${scope} ${option1})
else()
target_compile_options(${target} ${scope} ${option2})
endif()
endfunction()
function(target_ld_options target scope)
foreach(option ${ARGN})
string(MAKE_C_IDENTIFIER check${option} check)
check_c_compiler_flag(${option} ${check})
target_link_libraries_ifdef(${check} ${target} ${scope} ${option})
endforeach()
endfunction()
# 3.4. Debugging CMake
# Usage:
# print(BOARD)
#
# will print: "BOARD: nrf52_pca10040"
function(print arg)
message(STATUS "${arg}: ${${arg}}")
endfunction()
# Usage:
# assert(ZEPHYR_GCC_VARIANT "ZEPHYR_GCC_VARIANT not set.")
#
# will cause a FATAL_ERROR and print an error message if the first
# expression is false
macro(assert test comment)
if(NOT ${test})
message(FATAL_ERROR "Assertion failed: ${comment}")
endif()
endmacro()
# Usage:
# assert_exists(CMAKE_READELF)
#
# will cause a FATAL_ERROR if there is no file or directory behind the
# variable
macro(assert_exists var)
if(NOT EXISTS ${${var}})
message(FATAL_ERROR "No such file or directory: ${var}: '${${var}}'")
endif()
endmacro()
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