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CMakeLists.txt
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CMakeLists.txt
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# SPDX-License-Identifier: Apache-2.0
# *DOCUMENTATION*
#
# Note that this is *NOT* the top-level CMakeLists.txt. That's in the
# application. See the Application Development Primer documentation
# for details.
#
# To see a list of typical targets execute "make usage"
# More info can be located in ./README.rst
# Comments in this file are targeted only to the developer, do not
# expect to learn how to build the kernel reading this file.
if(NOT DEFINED ZEPHYR_BINARY_DIR)
message(FATAL_ERROR "A user error has occurred.
cmake was invoked with '${CMAKE_CURRENT_LIST_DIR}' specified as the source directory,
but it must be invoked with an application source directory,
such as '${CMAKE_CURRENT_LIST_DIR}/samples/hello_world'.
Debug variables:
CMAKE_CACHEFILE_DIR: ${CMAKE_CACHEFILE_DIR}
")
endif()
# See https://gitlab.kitware.com/cmake/cmake/issues/16228
# and https://cmake.org/pipermail/cmake/2019-May/thread.html#69496
if(NOT ZEPHYR_BASE STREQUAL CMAKE_CURRENT_SOURCE_DIR)
message(WARNING "ZEPHYR_BASE doesn't match CMAKE_CURRENT_SOURCE_DIR
ZEPHYR_BASE = ${ZEPHYR_BASE}
PWD = $ENV{PWD}
CMAKE_CURRENT_SOURCE_DIR = ${CMAKE_CURRENT_SOURCE_DIR}
You may be using a mix of symbolic links and real paths which causes \
subtle and hard to debug CMake issues.")
endif()
# For Zephyr more specifically this breaks (at least)
# -fmacro-prefix-map=${ZEPHYR_BASE}=
# In some cases the "final" things are not used at all and "_prebuilt"
# is the last station. See "logical_target_for_zephyr_elf" below for
# details.
set(CMAKE_EXECUTABLE_SUFFIX .elf)
# Zephyr build system will use a dynamic number of linking stages based on build
# configuration.
#
# Currently up to three linking stages may be executed:
# zephyr_pre0: First linking stage
# zephyr_pre1: Second linking stage
# zephyr_final: Final linking stage
#
# There will at minimum be a single linking stage.
# When only a single linking stage is required, the `zephyr_pre0` will be mapped
# into the `zephyr_final` target.
#
# Multiple linking stages are required in the following cases:
# - device dependencies structs must be generated (CONFIG_DEVICE_DEPS=y)
# - ISR tables must be generated (CONFIG_GEN_ISR_TABLES=y)
# - Kernel objects hash tables (CONFIG_USERSPACE=y)
# - Application memory partitions (CONFIG_USERSPACE=y)
#
# Some generators require that memory locations has been fixed, thus those are
# placed at the second linking stage.
#
# When all three linking stages are active, then the following properties applies:
# - zephyr_pre0: linker sections may resize / addresses may relocate
# - zephyr_pre1: All linker section sizes are fixed, addresses cannot change
# - zephyr_final: Final image.
#
set(ZEPHYR_CURRENT_LINKER_PASS 0)
set(ZEPHYR_CURRENT_LINKER_CMD linker_zephyr_pre${ZEPHYR_CURRENT_LINKER_PASS}.cmd)
set(ZEPHYR_LINK_STAGE_EXECUTABLE zephyr_pre${ZEPHYR_CURRENT_LINKER_PASS})
# ZEPHYR_PREBUILT_EXECUTABLE is used outside of this file, therefore keep the
# existing variable to allow slowly cleanup of linking stage handling.
# Three stage linking active: pre0 -> pre1 -> final, this will correspond to `pre1`
# Two stage linking active: pre0 -> final, this will correspond to `pre0`
if(CONFIG_USERSPACE OR CONFIG_DEVICE_DEPS)
set(ZEPHYR_PREBUILT_EXECUTABLE zephyr_pre1)
else()
set(ZEPHYR_PREBUILT_EXECUTABLE zephyr_pre0)
endif()
set(ZEPHYR_FINAL_EXECUTABLE zephyr_final)
# Set some phony targets to collect dependencies
set(OFFSETS_H_TARGET offsets_h)
set(SYSCALL_LIST_H_TARGET syscall_list_h_target)
set(DRIVER_VALIDATION_H_TARGET driver_validation_h_target)
set(KOBJ_TYPES_H_TARGET kobj_types_h_target)
set(PARSE_SYSCALLS_TARGET parse_syscalls_target)
define_property(GLOBAL PROPERTY PROPERTY_OUTPUT_FORMAT BRIEF_DOCS " " FULL_DOCS " ")
set_property( GLOBAL PROPERTY PROPERTY_OUTPUT_FORMAT elf32-little${ARCH}) # BFD format
# Contains the list of files with syscall function prototypes.
add_library(syscalls_interface INTERFACE)
set(syscalls_file_list_output
${CMAKE_CURRENT_BINARY_DIR}/misc/generated/syscalls_file_list.txt)
# "zephyr_interface" is a source-less library that encapsulates all the global
# compiler options needed by all source files. All zephyr libraries,
# including the library named "zephyr" link with this library to
# obtain these flags.
# https://cmake.org/cmake/help/latest/manual/cmake-buildsystem.7.html#interface-libraries
add_library(zephyr_interface INTERFACE)
# "zephyr" is a catch-all CMake library for source files that can be
# built purely with the include paths, defines, and other compiler
# flags that come with zephyr_interface.
zephyr_library_named(zephyr)
zephyr_include_directories(
include
${PROJECT_BINARY_DIR}/include/generated
${USERINCLUDE}
${STDINCLUDE}
)
include(${ZEPHYR_BASE}/cmake/linker_script/${ARCH}/linker.cmake OPTIONAL)
zephyr_include_directories(${SOC_FULL_DIR})
# Don't inherit compiler flags from the environment
foreach(var AFLAGS CFLAGS CXXFLAGS CPPFLAGS LDFLAGS)
if(DEFINED ENV{${var}})
message(WARNING "The environment variable '${var}' was set to $ENV{${var}}, "
"but Zephyr ignores flags from the environment. Use 'cmake "
"-DEXTRA_${var}=$ENV{${var}}' instead."
)
unset(ENV{${var}})
endif()
endforeach()
zephyr_compile_definitions(
KERNEL
__ZEPHYR__=1
)
# Ensure that include/zephyr/toolchain.h includes toolchain/other.h for all off-tree toolchains
if(TOOLCHAIN_USE_CUSTOM)
zephyr_compile_definitions(__TOOLCHAIN_CUSTOM__)
endif()
# @Intent: Set compiler specific flag for disabling strict aliasing rule
zephyr_compile_options($<$<COMPILE_LANGUAGE:C>:$<TARGET_PROPERTY:compiler,no_strict_aliasing>>)
zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:$<TARGET_PROPERTY:compiler-cpp,no_strict_aliasing>>)
# Extra warnings options for twister run
if (CONFIG_COMPILER_WARNINGS_AS_ERRORS)
zephyr_compile_options($<$<COMPILE_LANGUAGE:C>:$<TARGET_PROPERTY:compiler,warnings_as_errors>>)
zephyr_compile_options($<$<COMPILE_LANGUAGE:ASM>:$<TARGET_PROPERTY:asm,warnings_as_errors>>)
zephyr_link_libraries($<TARGET_PROPERTY:linker,warnings_as_errors>)
endif()
# @Intent: Set compiler flags to enable buffer overflow checks in libc functions
# @details:
# Kconfig.zephyr "Detect buffer overflows in libc calls" is a kconfig choice,
# ensuring at most *one* of CONFIG_FORTIFY_SOURCE_{COMPILE_TIME,RUN_TIME} is
# set. Refer to Kconfig.zephyr for selection logic and description of these
# choices. Toolchains set both of the security_fortify_{compile_time,run_time}
# properties and the Kconfig settings are used here to select between those.
#
if(CONFIG_FORTIFY_SOURCE_RUN_TIME)
zephyr_compile_definitions($<TARGET_PROPERTY:compiler,security_fortify_run_time> )
elseif(CONFIG_FORTIFY_SOURCE_COMPILE_TIME)
zephyr_compile_definitions($<TARGET_PROPERTY:compiler,security_fortify_compile_time> )
endif()
# @Intent: Set compiler flags to detect general stack overflows across all functions
if(CONFIG_STACK_CANARIES)
zephyr_compile_options($<TARGET_PROPERTY:compiler,security_canaries>)
endif()
# @Intent: Obtain compiler optimizations flags and store in variables
# @details:
# Kconfig.zephyr "Optimization level" is a kconfig choice, ensuring
# only *one* of CONFIG_{NO,DEBUG,SPEED,SIZE}_OPTIMIZATIONS is set.
# Refer to Kconfig.zephyr for selection logic and description of these choices.
# toolchain_cc_optimize_*() macros must provide the mapping from these kconfigs
# to compiler flags. Each macro will store the flags in a CMake variable, whose
# name is passed as argument (somewhat like by reference).
#
# If the user wants to tweak the optimizations, there are two ways:
# 1) Using EXTRA_CFLAGS which is applied regardless of kconfig choice, or
# 2) Rely on override support being implemented by your toolchain_cc_optimize_*()
#
get_property(OPTIMIZE_FOR_NO_OPTIMIZATIONS_FLAG TARGET compiler PROPERTY no_optimization)
get_property(OPTIMIZE_FOR_DEBUG_FLAG TARGET compiler PROPERTY optimization_debug)
get_property(OPTIMIZE_FOR_SPEED_FLAG TARGET compiler PROPERTY optimization_speed)
get_property(OPTIMIZE_FOR_SIZE_FLAG TARGET compiler PROPERTY optimization_size)
# From kconfig choice, pick the actual OPTIMIZATION_FLAG to use.
# Kconfig choice ensures only one of these CONFIG_*_OPTIMIZATIONS is set.
if(CONFIG_NO_OPTIMIZATIONS)
set(OPTIMIZATION_FLAG ${OPTIMIZE_FOR_NO_OPTIMIZATIONS_FLAG})
elseif(CONFIG_DEBUG_OPTIMIZATIONS)
set(OPTIMIZATION_FLAG ${OPTIMIZE_FOR_DEBUG_FLAG})
elseif(CONFIG_SPEED_OPTIMIZATIONS)
set(OPTIMIZATION_FLAG ${OPTIMIZE_FOR_SPEED_FLAG})
elseif(CONFIG_SIZE_OPTIMIZATIONS)
set(OPTIMIZATION_FLAG ${OPTIMIZE_FOR_SIZE_FLAG}) # Default in kconfig
else()
message(FATAL_ERROR
"Unreachable code. Expected optimization level to have been chosen. See Kconfig.zephyr")
endif()
if(NOT CONFIG_ARCH_IS_SET)
message(WARNING "\
None of the CONFIG_<arch> (e.g. CONFIG_X86) symbols are set. \
Select one of them from the SOC_SERIES_* symbol or, lacking that, from the \
SOC_* symbol.")
endif()
# Apply the final optimization flag(s)
zephyr_compile_options(${OPTIMIZATION_FLAG})
if(CONFIG_LTO)
zephyr_compile_options($<TARGET_PROPERTY:compiler,optimization_lto>)
add_link_options($<TARGET_PROPERTY:linker,lto_arguments>)
endif()
# @Intent: Obtain compiler specific flags related to C++ that are not influenced by kconfig
zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:$<TARGET_PROPERTY:compiler-cpp,required>>)
# @Intent: Obtain compiler specific flags for compiling under different ISO standards of C++
if(CONFIG_CPP)
# From kconfig choice, pick a single dialect.
# Kconfig choice ensures only one of these CONFIG_STD_CPP* is set.
if(CONFIG_STD_CPP98)
set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp98>)
list(APPEND CMAKE_CXX_COMPILE_FEATURES ${compile_features_cpp98})
elseif(CONFIG_STD_CPP11)
set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp11>) # Default in kconfig
list(APPEND CMAKE_CXX_COMPILE_FEATURES ${compile_features_cpp11})
elseif(CONFIG_STD_CPP14)
set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp14>)
list(APPEND CMAKE_CXX_COMPILE_FEATURES ${compile_features_cpp14})
elseif(CONFIG_STD_CPP17)
set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp17>)
list(APPEND CMAKE_CXX_COMPILE_FEATURES ${compile_features_cpp17})
elseif(CONFIG_STD_CPP2A)
set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp2a>)
list(APPEND CMAKE_CXX_COMPILE_FEATURES ${compile_features_cpp20})
elseif(CONFIG_STD_CPP20)
set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp20>)
list(APPEND CMAKE_CXX_COMPILE_FEATURES ${compile_features_cpp20})
elseif(CONFIG_STD_CPP2B)
set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp2b>)
list(APPEND CMAKE_CXX_COMPILE_FEATURES ${compile_features_cpp20})
else()
message(FATAL_ERROR
"Unreachable code. Expected C++ standard to have been chosen. See Kconfig.zephyr.")
endif()
set(CMAKE_CXX_COMPILE_FEATURES ${CMAKE_CXX_COMPILE_FEATURES} PARENT_SCOPE)
zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:${STD_CPP_DIALECT_FLAGS}>)
endif()
if(NOT CONFIG_CPP_EXCEPTIONS)
# @Intent: Obtain compiler specific flags related to C++ Exceptions
zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:$<TARGET_PROPERTY:compiler-cpp,no_exceptions>>)
endif()
if(NOT CONFIG_CPP_RTTI)
# @Intent: Obtain compiler specific flags related to C++ Run Time Type Information
zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:$<TARGET_PROPERTY:compiler-cpp,no_rtti>>)
endif()
if(CONFIG_MISRA_SANE)
# @Intent: Obtain toolchain compiler flags relating to MISRA.
zephyr_compile_options($<$<COMPILE_LANGUAGE:C>:$<TARGET_PROPERTY:compiler,warning_error_misra_sane>>)
zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:$<TARGET_PROPERTY:compiler-cpp,warning_error_misra_sane>>)
endif()
# This is intend to be temporary. Once we have fixed the violations that
# prevents build Zephyr, these flags shall be part of the default flags.
if(CONFIG_CODING_GUIDELINE_CHECK)
# @Intent: Obtain toolchain compiler flags relating to coding guideline
zephyr_compile_options($<$<COMPILE_LANGUAGE:C>:$<TARGET_PROPERTY:compiler,warning_error_coding_guideline>>)
endif()
# @Intent: Set compiler specific macro inclusion of AUTOCONF_H
zephyr_compile_options("SHELL: $<TARGET_PROPERTY:compiler,imacros> ${AUTOCONF_H}")
if(CONFIG_COMPILER_FREESTANDING)
# @Intent: Set compiler specific flag for bare metal freestanding option
zephyr_compile_options($<$<COMPILE_LANGUAGE:C>:$<TARGET_PROPERTY:compiler,freestanding>>)
zephyr_compile_options($<$<COMPILE_LANGUAGE:ASM>:$<TARGET_PROPERTY:compiler,freestanding>>)
endif()
if (CONFIG_PICOLIBC AND NOT CONFIG_PICOLIBC_IO_FLOAT)
# @Intent: Set compiler specific flag to disable printf-related optimizations
zephyr_compile_options($<$<COMPILE_LANGUAGE:C>:$<TARGET_PROPERTY:compiler,no_printf_return_value>>)
endif()
# @Intent: Set compiler specific flag for tentative definitions, no-common
zephyr_compile_options($<TARGET_PROPERTY:compiler,no_common>)
# @Intent: Set compiler specific flag for production of debug information
zephyr_compile_options($<TARGET_PROPERTY:compiler,debug>)
if(CONFIG_COMPILER_SAVE_TEMPS)
# @Intent: Set compiler specific flag for saving temporary object files
zephyr_compile_options($<TARGET_PROPERTY:compiler,save_temps>)
endif()
if(NOT CONFIG_COMPILER_TRACK_MACRO_EXPANSION)
# @Intent: Set compiler specific flags to not track macro expansion
zephyr_compile_options($<TARGET_PROPERTY:compiler,no_track_macro_expansion>)
endif()
if(CONFIG_COMPILER_COLOR_DIAGNOSTICS)
# @Intent: Set compiler specific flag for diagnostic messages
zephyr_compile_options($<TARGET_PROPERTY:compiler,diagnostic>)
endif()
zephyr_compile_options(
${TOOLCHAIN_C_FLAGS}
)
# @Intent: Obtain compiler specific flags related to assembly
# ToDo: Remember to get feedback from Oticon on this, as they might use the `ASM_BASE_FLAG` since this is done this way.
zephyr_compile_options($<$<COMPILE_LANGUAGE:ASM>:$<TARGET_PROPERTY:asm,required>>)
# @Intent: Enforce standard integer type correspondence to match Zephyr usage.
# (must be after compiler specific flags)
if(CONFIG_ENFORCE_ZEPHYR_STDINT)
zephyr_compile_options("SHELL: $<TARGET_PROPERTY:compiler,imacros> ${ZEPHYR_BASE}/include/zephyr/toolchain/zephyr_stdint.h")
endif()
# Common toolchain-agnostic assembly flags
zephyr_compile_options(
$<$<COMPILE_LANGUAGE:ASM>:-D_ASMLANGUAGE>
)
# @Intent: Set fundamental linker specific flags
toolchain_ld_base()
toolchain_ld_force_undefined_symbols(
_OffsetAbsSyms
_ConfigAbsSyms
)
if(NOT CONFIG_NATIVE_BUILD)
# @Intent: Set linker specific flags for bare metal target
toolchain_ld_baremetal()
endif()
if(CONFIG_CPP AND NOT CONFIG_MINIMAL_LIBCPP AND NOT CONFIG_NATIVE_LIBRARY)
# @Intent: Set linker specific flags for C++
toolchain_ld_cpp()
endif()
# @Intent: Add the basic toolchain warning flags
zephyr_compile_options($<$<COMPILE_LANGUAGE:C>:$<TARGET_PROPERTY:compiler,warning_base>>)
zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:$<TARGET_PROPERTY:compiler-cpp,warning_base>>)
# ==========================================================================
#
# cmake -DW=... settings
#
# W=1 - warnings that may be relevant and does not occur too often
# W=2 - warnings that occur quite often but may still be relevant
# W=3 - the more obscure warnings, can most likely be ignored
# ==========================================================================
# @Intent: Add cmake -DW toolchain supported warnings, if any
if(W MATCHES "1")
zephyr_compile_options($<$<COMPILE_LANGUAGE:C>:$<TARGET_PROPERTY:compiler,warning_dw_1>>)
zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:$<TARGET_PROPERTY:compiler-cpp,warning_dw_1>>)
endif()
if(W MATCHES "2")
zephyr_compile_options($<$<COMPILE_LANGUAGE:C>:$<TARGET_PROPERTY:compiler,warning_dw_2>>)
zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:$<TARGET_PROPERTY:compiler-cpp,warning_dw_2>>)
endif()
if(W MATCHES "3")
zephyr_compile_options($<$<COMPILE_LANGUAGE:C>:$<TARGET_PROPERTY:compiler,warning_dw_3>>)
zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:$<TARGET_PROPERTY:compiler-cpp,warning_dw_3>>)
endif()
# @Intent: Add extended, more specific, toolchain warning flags
zephyr_compile_options($<TARGET_PROPERTY:compiler,warning_extended>)
# @Intent: Trigger an error when a declaration does not specify a type
zephyr_compile_options($<$<COMPILE_LANGUAGE:C>:$<TARGET_PROPERTY:compiler,warning_error_implicit_int>>)
zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:$<TARGET_PROPERTY:compiler-cpp,warning_error_implicit_int>>)
# @Intent: Do not make position independent code / executable
zephyr_compile_options($<$<COMPILE_LANGUAGE:C>:$<TARGET_PROPERTY:compiler,no_position_independent>>)
zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:$<TARGET_PROPERTY:compiler,no_position_independent>>)
# In case of CONFIG_NATIVE_LIBRARY we also don't want position independent code,
# but we cannot tell that to the linker yet as we are first only doing a
# relocatable link into a static library
zephyr_link_libraries_ifndef(CONFIG_NATIVE_LIBRARY
$<TARGET_PROPERTY:linker,no_position_independent>)
# Allow the user to inject options when calling cmake, e.g.
# 'cmake -DEXTRA_CFLAGS="-Werror -Wno-deprecated-declarations" ..'
include(cmake/extra_flags.cmake)
zephyr_cc_option(-fno-asynchronous-unwind-tables)
if(CONFIG_USERSPACE)
zephyr_compile_options($<TARGET_PROPERTY:compiler,no_global_merge>)
endif()
if(CONFIG_THREAD_LOCAL_STORAGE)
# Only support local exec TLS model at this point.
zephyr_cc_option(-ftls-model=local-exec)
endif()
if(CONFIG_OVERRIDE_FRAME_POINTER_DEFAULT)
if(CONFIG_OMIT_FRAME_POINTER)
zephyr_cc_option(-fomit-frame-pointer)
else()
zephyr_cc_option(-fno-omit-frame-pointer)
endif()
endif()
separate_arguments(COMPILER_OPT_AS_LIST UNIX_COMMAND ${CONFIG_COMPILER_OPT})
zephyr_compile_options(${COMPILER_OPT_AS_LIST})
# TODO: Include arch compiler options at this point.
if(NOT CMAKE_C_COMPILER_ID STREQUAL "Clang" AND
NOT CMAKE_C_COMPILER_ID STREQUAL "IntelLLVM" AND
NOT CMAKE_C_COMPILER_ID STREQUAL "ARMClang")
# GCC assumed
zephyr_cc_option(-fno-reorder-functions)
# GCC 11 and above may generate a warning when dereferencing a constant
# address pointer whose address is below the value specified by the
# `min-pagesize` parameter (defaults to 0x1000). The `min-pagesize` parameter
# is set to 0 such that GCC never generates any warnings for the constant
# address pointers. For more details, refer to the GCC PR99578.
zephyr_cc_option(--param=min-pagesize=0)
if(NOT ${ZEPHYR_TOOLCHAIN_VARIANT} STREQUAL "xcc")
zephyr_cc_option(-fno-defer-pop)
endif()
else()
# Clang produces false positive vla warnings
zephyr_cc_option(-Wno-vla)
endif()
zephyr_cc_option_ifdef(CONFIG_STACK_USAGE -fstack-usage)
# If the compiler supports it, strip the ${ZEPHYR_BASE} prefix from the
# __FILE__ macro used in __ASSERT*, in the
# .noinit."/home/joe/zephyr/fu/bar.c" section names and in any
# application code. This saves some memory, stops leaking user locations
# in binaries, makes failure logs more deterministic and most
# importantly makes builds more deterministic
if(CONFIG_BUILD_OUTPUT_STRIP_PATHS)
# If several match then the last one wins. This matters for instances
# like tests/ and samples/: they're inside all of them! Then let's
# strip as little as possible.
zephyr_cc_option(-fmacro-prefix-map=${CMAKE_SOURCE_DIR}=CMAKE_SOURCE_DIR)
zephyr_cc_option(-fmacro-prefix-map=${ZEPHYR_BASE}=ZEPHYR_BASE)
if(WEST_TOPDIR)
zephyr_cc_option(-fmacro-prefix-map=${WEST_TOPDIR}=WEST_TOPDIR)
endif()
endif()
# TODO: Archiver arguments
# ar_option(D)
# Declare MPU userspace dependencies before the linker scripts to make
# sure the order of dependencies are met
if(CONFIG_USERSPACE)
add_custom_target(app_smem)
set(APP_SMEM_ALIGNED_DEP app_smem_aligned_linker)
set(APP_SMEM_UNALIGNED_DEP app_smem_unaligned_linker)
endif()
if(CONFIG_USERSPACE)
set(KOBJECT_LINKER_DEP kobject_linker)
endif()
if(DEFINED BUILD_VERSION)
set(build_version_argument "-DBUILD_VERSION=${BUILD_VERSION}")
elseif(NOT ZEPHYR_GIT_INDEX)
if(EXISTS ${ZEPHYR_BASE}/.git/index)
set(ZEPHYR_GIT_INDEX ${ZEPHYR_BASE}/.git/index CACHE PATH
"Path to Zephyr git repository index file")
elseif(EXISTS ${ZEPHYR_BASE}/.git)
# Likely a git-submodule. Let's ask git where the real database is located.
find_package(Git QUIET)
if(GIT_FOUND)
execute_process(
COMMAND ${GIT_EXECUTABLE} rev-parse --absolute-git-dir
WORKING_DIRECTORY ${ZEPHYR_BASE}
OUTPUT_VARIABLE zephyr_git_dir
OUTPUT_STRIP_TRAILING_WHITESPACE
ERROR_STRIP_TRAILING_WHITESPACE
ERROR_VARIABLE stderr
RESULT_VARIABLE return_code)
if(return_code)
message(WARNING "BUILD_VERSION: git rev-parse failed: ${stderr}")
else()
if(NOT "${stderr}" STREQUAL "")
message(WARNING "BUILD_VERSION: git rev-parse warned: ${stderr}")
endif()
set(ZEPHYR_GIT_INDEX ${zephyr_git_dir}/index CACHE PATH
"Path to Zephyr git repository index file")
endif()
else()
message(WARNING "Could not find git installation, "
"please specify '-DBUILD_VERSION=<version>'")
endif()
else()
message(WARNING "ZEPHYR_BASE=${ZEPHYR_BASE} doesn't appear to be a git "
"repository, please specify '-DBUILD_VERSION=<version>'")
endif()
endif()
if(ZEPHYR_GIT_INDEX)
set(git_dependency ${ZEPHYR_GIT_INDEX})
endif()
add_custom_command(
OUTPUT ${PROJECT_BINARY_DIR}/include/generated/version.h
COMMAND ${CMAKE_COMMAND} -DZEPHYR_BASE=${ZEPHYR_BASE}
-DOUT_FILE=${PROJECT_BINARY_DIR}/include/generated/version.h
-DVERSION_TYPE=KERNEL
-DVERSION_FILE=${ZEPHYR_BASE}/VERSION
-DKERNEL_VERSION_CUSTOMIZATION="$<TARGET_PROPERTY:version_h,KERNEL_VERSION_CUSTOMIZATION>"
${build_version_argument}
-P ${ZEPHYR_BASE}/cmake/gen_version_h.cmake
DEPENDS ${ZEPHYR_BASE}/VERSION ${git_dependency}
COMMAND_EXPAND_LISTS
)
add_custom_target(version_h DEPENDS ${PROJECT_BINARY_DIR}/include/generated/version.h)
if(EXISTS ${APPLICATION_SOURCE_DIR}/VERSION)
add_custom_command(
OUTPUT ${PROJECT_BINARY_DIR}/include/generated/app_version.h
COMMAND ${CMAKE_COMMAND} -DZEPHYR_BASE=${ZEPHYR_BASE}
-DOUT_FILE=${PROJECT_BINARY_DIR}/include/generated/app_version.h
-DVERSION_TYPE=APP
-DVERSION_FILE=${APPLICATION_SOURCE_DIR}/VERSION
-DAPP_VERSION_CUSTOMIZATION="$<TARGET_PROPERTY:app_version_h,APP_VERSION_CUSTOMIZATION>"
${build_version_argument}
-P ${ZEPHYR_BASE}/cmake/gen_version_h.cmake
DEPENDS ${APPLICATION_SOURCE_DIR}/VERSION ${git_dependency}
COMMAND_EXPAND_LISTS
)
add_custom_target(app_version_h DEPENDS ${PROJECT_BINARY_DIR}/include/generated/app_version.h)
add_dependencies(zephyr_interface app_version_h)
endif()
# Unfortunately, the order in which CMakeLists.txt code is processed
# matters so we need to be careful about how we order the processing
# of subdirectories. One example is "Compiler flags added late in the
# build are not exported to external build systems #5605"; when we
# integrate with an external build system we read out all compiler
# flags when the external project is created. So an external project
# defined in subsys or ext will not get global flags added by drivers/
# or tests/ as the subdirectories are ordered now.
#
# Another example of when the order matters is the reading and writing
# of global properties such as ZEPHYR_LIBS or
# GENERATED_KERNEL_OBJECT_FILES.
#
# Arch is placed early because it defines important compiler flags
# that must be exported to external build systems defined in
# e.g. subsys/.
add_subdirectory(arch)
add_subdirectory(lib)
# We use include instead of add_subdirectory to avoid creating a new directory scope.
# This is because source file properties are directory scoped, including the GENERATED
# property which is set implicitly for custom command outputs
include(misc/generated/CMakeLists.txt)
add_subdirectory(soc)
add_subdirectory(boards)
add_subdirectory(subsys)
add_subdirectory(drivers)
# Include zephyr modules generated CMake file.
foreach(module_name ${ZEPHYR_MODULE_NAMES})
# Note the second, binary_dir parameter requires the added
# subdirectory to have its own, local cmake target(s). If not then
# this binary_dir is created but stays empty. Object files land in
# the main binary dir instead.
# https://cmake.org/pipermail/cmake/2019-June/069547.html
zephyr_string(SANITIZE TOUPPER MODULE_NAME_UPPER ${module_name})
if(NOT ${ZEPHYR_${MODULE_NAME_UPPER}_CMAKE_DIR} STREQUAL "")
set(ZEPHYR_CURRENT_MODULE_NAME ${ZEPHYR_${MODULE_NAME_UPPER}_MODULE_NAME})
set(ZEPHYR_CURRENT_MODULE_DIR ${ZEPHYR_${MODULE_NAME_UPPER}_MODULE_DIR})
set(ZEPHYR_CURRENT_CMAKE_DIR ${ZEPHYR_${MODULE_NAME_UPPER}_CMAKE_DIR})
add_subdirectory(${ZEPHYR_CURRENT_CMAKE_DIR} ${CMAKE_BINARY_DIR}/modules/${module_name})
endif()
endforeach()
# Done processing modules, clear module variables
set(ZEPHYR_CURRENT_MODULE_NAME)
set(ZEPHYR_CURRENT_MODULE_DIR)
set(ZEPHYR_CURRENT_CMAKE_DIR)
get_property(LIBC_LINK_LIBRARIES TARGET zephyr_interface PROPERTY LIBC_LINK_LIBRARIES)
zephyr_link_libraries(${LIBC_LINK_LIBRARIES})
set(syscall_list_h ${CMAKE_CURRENT_BINARY_DIR}/include/generated/syscall_list.h)
set(syscalls_json ${CMAKE_CURRENT_BINARY_DIR}/misc/generated/syscalls.json)
set(struct_tags_json ${CMAKE_CURRENT_BINARY_DIR}/misc/generated/struct_tags.json)
# The syscalls subdirs txt file is constructed by python containing a list of folders to use for
# dependency handling, including empty folders.
# Windows: The list is used to specify DIRECTORY list with CMAKE_CONFIGURE_DEPENDS attribute.
# Other OS: The list will update whenever a file is added/removed/modified and ensure a re-build.
set(syscalls_subdirs_txt ${CMAKE_CURRENT_BINARY_DIR}/misc/generated/syscalls_subdirs.txt)
# As syscalls_subdirs_txt is updated whenever a file is modified, this file can not be used for
# monitoring of added / removed folders. A trigger file is thus used for correct dependency
# handling. The trigger file will update when a folder is added / removed.
set(syscalls_subdirs_trigger ${CMAKE_CURRENT_BINARY_DIR}/misc/generated/syscalls_subdirs.trigger)
if(NOT (${CMAKE_HOST_SYSTEM_NAME} STREQUAL Windows))
set(syscalls_links --create-links ${CMAKE_CURRENT_BINARY_DIR}/misc/generated/syscalls_links)
endif()
# When running CMake it must be ensured that all dependencies are correctly acquired.
execute_process(
COMMAND
${PYTHON_EXECUTABLE}
${ZEPHYR_BASE}/scripts/build/subfolder_list.py
--directory ${ZEPHYR_BASE}/include # Walk this directory
--out-file ${syscalls_subdirs_txt} # Write file with discovered folder
--trigger-file ${syscalls_subdirs_trigger} # Trigger file that is used for json generation
${syscalls_links} # If defined, create symlinks for dependencies
)
file(STRINGS ${syscalls_subdirs_txt} PARSE_SYSCALLS_PATHS_DEPENDS ENCODING UTF-8)
if(${CMAKE_HOST_SYSTEM_NAME} STREQUAL Windows)
# On windows only adding/removing files or folders will be reflected in depends.
# Hence adding a file requires CMake to re-run to add this file to the file list.
set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${PARSE_SYSCALLS_PATHS_DEPENDS})
# Also On Windows each header file must be monitored as file modifications are not reflected
# on directory level.
file(GLOB_RECURSE PARSE_SYSCALLS_HEADER_DEPENDS ${ZEPHYR_BASE}/include/*.h)
else()
# The syscall parsing depends on the folders in order to detect add/removed/modified files.
# When a folder is removed, CMake will try to find a target that creates that dependency.
# This command sets up the target for CMake to find.
# Without this code, CMake will fail with the following error:
# <folder> needed by '<target>', missing and no known rule to make it
# when a folder is removed.
add_custom_command(OUTPUT ${PARSE_SYSCALLS_PATHS_DEPENDS}
COMMAND ${CMAKE_COMMAND} -E echo ""
COMMENT "Preparing syscall dependency handling"
)
add_custom_command(
OUTPUT
${syscalls_subdirs_trigger}
COMMAND
${PYTHON_EXECUTABLE}
${ZEPHYR_BASE}/scripts/build/subfolder_list.py
--directory ${ZEPHYR_BASE}/include # Walk this directory
--out-file ${syscalls_subdirs_txt} # Write file with discovered folder
--trigger-file ${syscalls_subdirs_trigger} # Trigger file that is used for json generation
${syscalls_links} # If defined, create symlinks for dependencies
DEPENDS ${PARSE_SYSCALLS_PATHS_DEPENDS}
)
# Ensure subdir file always exists when specifying CMake dependency.
if(NOT EXISTS ${syscalls_subdirs_txt})
file(WRITE ${syscalls_subdirs_txt} "")
endif()
# On other OS'es, modifying a file is reflected on the folder timestamp and hence detected
# when using depend on directory level.
# Thus CMake only needs to re-run when sub-directories are added / removed, which is indicated
# using a trigger file.
set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${syscalls_subdirs_txt})
endif()
# syscall declarations are searched for in the SYSCALL_INCLUDE_DIRS
if(CONFIG_APPLICATION_DEFINED_SYSCALL)
list(APPEND SYSCALL_INCLUDE_DIRS ${APPLICATION_SOURCE_DIR})
endif()
if(CONFIG_ZTEST)
list(APPEND SYSCALL_INCLUDE_DIRS ${ZEPHYR_BASE}/subsys/testsuite/ztest/include)
if(CONFIG_NO_OPTIMIZATIONS AND CONFIG_ZTEST_WARN_NO_OPTIMIZATIONS)
message(WARNING "Running tests with CONFIG_NO_OPTIMIZATIONS is generally "
"not supported and known to break in many cases due to stack overflow or "
"other problems. Please do not file issues about it unless the test is "
"specifically tuned to run in this configuration. To disable this warning "
"set CONFIG_ZTEST_WARN_NO_OPTIMIZATIONS=n.")
endif()
endif()
get_property(
syscalls_include_list
TARGET syscalls_interface
PROPERTY INTERFACE_INCLUDE_DIRECTORIES
)
list(APPEND SYSCALL_INCLUDE_DIRS ${syscalls_include_list})
foreach(d ${SYSCALL_INCLUDE_DIRS})
list(APPEND parse_syscalls_include_args
--include ${d}
)
endforeach()
add_custom_command(
OUTPUT
${syscalls_json}
${struct_tags_json}
COMMAND
${PYTHON_EXECUTABLE}
${ZEPHYR_BASE}/scripts/build/parse_syscalls.py
--scan ${ZEPHYR_BASE}/include # Read files from this dir
--scan ${ZEPHYR_BASE}/drivers # For net sockets
--scan ${ZEPHYR_BASE}/subsys/net # More net sockets
${parse_syscalls_include_args} # Read files from these dirs also
--json-file ${syscalls_json} # Write this file
--tag-struct-file ${struct_tags_json} # Write subsystem list to this file
--file-list ${syscalls_file_list_output}
$<$<BOOL:${CONFIG_EMIT_ALL_SYSCALLS}>:--emit-all-syscalls>
DEPENDS ${syscalls_subdirs_trigger} ${PARSE_SYSCALLS_HEADER_DEPENDS}
${syscalls_file_list_output} ${syscalls_interface}
)
# Make sure Picolibc is built before the rest of the system; there's no explicit
# reference to any of the files as they're all picked up by various compiler
# settings
if(CONFIG_PICOLIBC_USE_MODULE)
set(picolibc_dependency PicolibcBuild)
endif()
add_custom_target(${SYSCALL_LIST_H_TARGET} DEPENDS ${syscall_list_h} ${picolibc_dependency})
set_property(TARGET ${SYSCALL_LIST_H_TARGET}
APPEND PROPERTY
ADDITIONAL_CLEAN_FILES
${CMAKE_CURRENT_BINARY_DIR}/include/generated/syscalls
)
add_custom_target(${PARSE_SYSCALLS_TARGET}
DEPENDS
${syscalls_json}
${struct_tags_json}
)
# 64-bit systems do not require special handling of 64-bit system call
# parameters or return values, indicate this to the system call boilerplate
# generation script.
if(CONFIG_64BIT)
set(SYSCALL_LONG_REGISTERS_ARG --long-registers)
endif()
if(CONFIG_TIMEOUT_64BIT)
set(SYSCALL_SPLIT_TIMEOUT_ARG --split-type k_timeout_t --split-type k_ticks_t)
endif()
add_custom_command(OUTPUT include/generated/syscall_dispatch.c ${syscall_list_h}
# Also, some files are written to include/generated/syscalls/
COMMAND
${PYTHON_EXECUTABLE}
${ZEPHYR_BASE}/scripts/build/gen_syscalls.py
--json-file ${syscalls_json} # Read this file
--base-output include/generated/syscalls # Write to this dir
--syscall-dispatch include/generated/syscall_dispatch.c # Write this file
--syscall-export-llext include/generated/syscall_export_llext.c
--syscall-list ${syscall_list_h}
$<$<BOOL:${CONFIG_USERSPACE}>:--gen-mrsh-files>
${SYSCALL_LONG_REGISTERS_ARG}
${SYSCALL_SPLIT_TIMEOUT_ARG}
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
DEPENDS ${PARSE_SYSCALLS_TARGET}
)
# This is passed into all calls to the gen_kobject_list.py script.
set(gen_kobject_list_include_args --include-subsystem-list ${struct_tags_json})
set(DRV_VALIDATION ${PROJECT_BINARY_DIR}/include/generated/driver-validation.h)
add_custom_command(
OUTPUT ${DRV_VALIDATION}
COMMAND
${PYTHON_EXECUTABLE}
${ZEPHYR_BASE}/scripts/build/gen_kobject_list.py
--validation-output ${DRV_VALIDATION}
${gen_kobject_list_include_args}
$<$<BOOL:${CMAKE_VERBOSE_MAKEFILE}>:--verbose>
DEPENDS
${ZEPHYR_BASE}/scripts/build/gen_kobject_list.py
${PARSE_SYSCALLS_TARGET}
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
)
add_custom_target(${DRIVER_VALIDATION_H_TARGET} DEPENDS ${DRV_VALIDATION})
include(${ZEPHYR_BASE}/cmake/kobj.cmake)
gen_kobj(KOBJ_INCLUDE_PATH)
# Add a pseudo-target that is up-to-date when all generated headers
# are up-to-date.
add_custom_target(zephyr_generated_headers)
add_dependencies(zephyr_generated_headers
offsets_h version_h
)
# Generate offsets.c.obj from offsets.c
# Generate offsets.h from offsets.c.obj
set(OFFSETS_LIB offsets)
set(OFFSETS_C_PATH ${ARCH_DIR}/${ARCH}/core/offsets/offsets.c)
set(OFFSETS_H_PATH ${PROJECT_BINARY_DIR}/include/generated/offsets.h)
add_library( ${OFFSETS_LIB} OBJECT ${OFFSETS_C_PATH})
target_include_directories(${OFFSETS_LIB} PRIVATE
kernel/include
${ARCH_DIR}/${ARCH}/include
)
# Make sure that LTO will never be enabled when compiling offsets.c
set_source_files_properties(${OFFSETS_C_PATH} PROPERTIES COMPILE_OPTIONS $<TARGET_PROPERTY:compiler,prohibit_lto>)
target_link_libraries(${OFFSETS_LIB} zephyr_interface)
add_dependencies(zephyr_interface
${SYSCALL_LIST_H_TARGET}
${DRIVER_VALIDATION_H_TARGET}
${KOBJ_TYPES_H_TARGET}
)
add_custom_command(
OUTPUT ${OFFSETS_H_PATH}
COMMAND ${PYTHON_EXECUTABLE} ${ZEPHYR_BASE}/scripts/build/gen_offset_header.py
-i $<TARGET_OBJECTS:${OFFSETS_LIB}>
-o ${OFFSETS_H_PATH}
DEPENDS
${OFFSETS_LIB}
$<TARGET_OBJECTS:${OFFSETS_LIB}>
)
add_custom_target(${OFFSETS_H_TARGET} DEPENDS ${OFFSETS_H_PATH})
zephyr_get_include_directories_for_lang(C ZEPHYR_INCLUDES)
add_subdirectory(kernel)
get_property(
syscalls_file_list
TARGET syscalls_interface
PROPERTY INTERFACE_SOURCES
)
file(CONFIGURE OUTPUT ${syscalls_file_list_output}
CONTENT "@syscalls_file_list@" @ONLY)
# Read list content
get_property(ZEPHYR_LIBS_PROPERTY GLOBAL PROPERTY ZEPHYR_LIBS)
foreach(zephyr_lib ${ZEPHYR_LIBS_PROPERTY})
get_property(lib_type TARGET ${zephyr_lib} PROPERTY TYPE)
# To prevent CMake failure when a driver is enabled, for example: REGULATOR=y
# we disable any Zephyr libraries without sources and adds the `empty_file.c`.
if(${lib_type} STREQUAL STATIC_LIBRARY
AND NOT ${zephyr_lib} STREQUAL app
)
get_property(source_list TARGET ${zephyr_lib} PROPERTY SOURCES)
get_property(lib_imported TARGET ${zephyr_lib} PROPERTY IMPORTED)
if(NOT source_list
AND NOT ${lib_imported}
)
get_property(allow_empty TARGET ${zephyr_lib} PROPERTY ALLOW_EMPTY)
if(NOT "${allow_empty}")
message(WARNING
"No SOURCES given to Zephyr library: ${zephyr_lib}\nExcluding target from build."
)
endif()
target_sources(${zephyr_lib} PRIVATE ${ZEPHYR_BASE}/misc/empty_file.c)
set_property(TARGET ${zephyr_lib} PROPERTY EXCLUDE_FROM_ALL TRUE)
list(REMOVE_ITEM ZEPHYR_LIBS_PROPERTY ${zephyr_lib})
continue()
endif()
endif()
# TODO: Could this become an INTERFACE property of zephyr_interface?
add_dependencies(${zephyr_lib} zephyr_generated_headers)
endforeach()
if(CONFIG_LLEXT)
set(WHOLE_ARCHIVE_LIBS ${ZEPHYR_LIBS_PROPERTY} kernel)
else()
set(WHOLE_ARCHIVE_LIBS ${ZEPHYR_LIBS_PROPERTY})
set(NO_WHOLE_ARCHIVE_LIBS kernel)
endif()
get_property(OUTPUT_FORMAT GLOBAL PROPERTY PROPERTY_OUTPUT_FORMAT)
if (CONFIG_CODE_DATA_RELOCATION)
set(CODE_RELOCATION_DEP code_relocation_source_lib)
endif() # CONFIG_CODE_DATA_RELOCATION
# Give the linker script targets all of the include directories so
# that cmake can successfully find the linker scripts' header
# dependencies.
zephyr_get_include_directories_for_lang(C
ZEPHYR_INCLUDE_DIRS
STRIP_PREFIX # Don't use a -I prefix
)
if(CONFIG_DEVICE_DEPS)
if(CONFIG_DEVICE_DEPS_DYNAMIC)
set(dynamic_deps --dynamic-deps)
endif()
if(CONFIG_PM_DEVICE_POWER_DOMAIN_DYNAMIC)
set(number_of_dynamic_devices ${CONFIG_PM_DEVICE_POWER_DOMAIN_DYNAMIC_NUM})
else()
set(number_of_dynamic_devices 0)
endif()
# device_deps.c is generated from ${ZEPHYR_LINK_STAGE_EXECUTABLE} by
# gen_device_deps.py
add_custom_command(
OUTPUT device_deps.c
COMMAND
${PYTHON_EXECUTABLE}
${ZEPHYR_BASE}/scripts/build/gen_device_deps.py
--output-source device_deps.c
--output-graphviz dev_graph.dot
${dynamic_deps}
--num-dynamic-devices ${number_of_dynamic_devices}
--kernel $<TARGET_FILE:${ZEPHYR_LINK_STAGE_EXECUTABLE}>
--zephyr-base ${ZEPHYR_BASE}
--start-symbol "$<TARGET_PROPERTY:linker,devices_start_symbol>"
VERBATIM
DEPENDS ${ZEPHYR_LINK_STAGE_EXECUTABLE}
)
set_property(GLOBAL APPEND PROPERTY GENERATED_APP_SOURCE_FILES device_deps.c)
# gen_device_deps runs on `__device_deps_pass1` so pass this info to the linker script generator
list(APPEND LINKER_PASS_${ZEPHYR_CURRENT_LINKER_PASS}_DEFINE "LINKER_DEVICE_DEPS_PASS1")
endif()
if(CONFIG_CODE_DATA_RELOCATION)
# @Intent: Linker script to relocate .text, data and .bss sections
toolchain_ld_relocation()
endif()
if(CONFIG_USERSPACE)
zephyr_get_compile_options_for_lang_as_string(C compiler_flags_priv)
string(REPLACE "$<TARGET_PROPERTY:compiler,coverage>" ""
NO_COVERAGE_FLAGS "${compiler_flags_priv}"
)
set(GEN_KOBJ_LIST ${ZEPHYR_BASE}/scripts/build/gen_kobject_list.py)
set(PROCESS_GPERF ${ZEPHYR_BASE}/scripts/build/process_gperf.py)
endif()
get_property(CSTD GLOBAL PROPERTY CSTD)
if(NOT DEFINED CSTD)
if(CONFIG_STD_C23)
set(CSTD c2x)
elseif(CONFIG_STD_C17)
set(CSTD c17)
elseif(CONFIG_STD_C11)
set(CSTD c11)
elseif(CONFIG_STD_C99)
set(CSTD c99)
elseif(CONFIG_STD_C90)
set(CSTD c90)
else()
message(FATAL_ERROR "Unreachable code. Expected C standard to have been chosen.")
endif()
if(CONFIG_GNU_C_EXTENSIONS)
string(REPLACE "c" "gnu" CSTD "${CSTD}")
endif()
else()
message(DEPRECATION
"Global CSTD property is deprecated, see Kconfig.zephyr for C Standard options.")
endif()
# @Intent: Obtain compiler specific flag for specifying the c standard
zephyr_compile_options(
$<$<COMPILE_LANGUAGE:C>:$<TARGET_PROPERTY:compiler,cstd>${CSTD}>
)
set(CMAKE_C_COMPILE_FEATURES ${compile_features_${CSTD}} PARENT_SCOPE)
# @Intent: Configure linker scripts, i.e. generate linker scripts with variables substituted
toolchain_ld_configure_files()
get_property(TOPT GLOBAL PROPERTY TOPT)
get_property(COMPILER_TOPT TARGET compiler PROPERTY linker_script)
set_ifndef( TOPT "${COMPILER_TOPT}")
set_ifndef( TOPT -Wl,-T) # Use this if the compiler driver doesn't set a value
if(CONFIG_HAVE_CUSTOM_LINKER_SCRIPT)
set(LINKER_SCRIPT ${APPLICATION_SOURCE_DIR}/${CONFIG_CUSTOM_LINKER_SCRIPT})
if(NOT EXISTS ${LINKER_SCRIPT})
set(LINKER_SCRIPT ${CONFIG_CUSTOM_LINKER_SCRIPT})