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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}=
# Verify that the toolchain can compile a dummy file, if it is not we
# won't be able to test for compatibility with certain C flags.
zephyr_check_compiler_flag(C "" toolchain_is_ok)
assert(toolchain_is_ok "The toolchain is unable to build a dummy C file. See CMakeError.log.")
# 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)
set(ZEPHYR_PREBUILT_EXECUTABLE zephyr_prebuilt)
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
# "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)
# Don't add non-existing include directories, it creates noise and
# warnings in some tooling
foreach(optional_include_dir
${SOC_DIR}/${ARCH}/${SOC_PATH}
${SOC_DIR}/${ARCH}/${SOC_PATH}/include
${SOC_DIR}/${ARCH}/${SOC_FAMILY}/include
${SOC_DIR}/${ARCH}/${SOC_FAMILY}/common/include
)
if(EXISTS ${optional_include_dir})
zephyr_include_directories(${optional_include_dir})
endif()
endforeach()
zephyr_compile_definitions(
KERNEL
__ZEPHYR__=1
)
# Ensure that include/toolchain.h includes toolchain/other.h for all off-tree toolchains
if(TOOLCHAIN_USE_CUSTOM)
zephyr_compile_definitions(__TOOLCHAIN_CUSTOM__)
endif()
# @Intent: Set compiler flags to enable buffer overflow checks in libc functions
# @config in CONFIG_NO_OPTIMIZATIONS optional : Optimizations may affect security
zephyr_compile_definitions($<TARGET_PROPERTY:compiler,security_fortify> )
# @Intent: Set compiler flags to detect general stack overflows across all functions
if(CONFIG_STACK_CANARIES)
zephyr_compile_options($<TARGET_PROPERTY:compiler,security_canaries>)
endif()
if(BUILD_VERSION)
zephyr_compile_definitions(
BUILD_VERSION=${BUILD_VERSION}
)
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 ${OPTIMIZE_FOR_SIZE_FLAG}) # Default in kconfig
else()
assert(0 "Unreachable code. Expected optimization level to have been chosen. See Kconfig.zephyr")
endif()
if(NOT CONFIG_ARCH_IS_SET)
message(WARNING "\
None of the CONFIG_<arch> (e.g. CONFIG_X86) symbols are set. \
Select one of them from the SOC_SERIES_* symbol or, lacking that, from the \
SOC_* symbol.")
endif()
# Apply the final optimization flag(s)
zephyr_compile_options(${OPTIMIZATION_FLAG})
# @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_CPLUSPLUS)
# 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>)
elseif(CONFIG_STD_CPP11)
set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp11>) # Default in kconfig
elseif(CONFIG_STD_CPP14)
set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp14>)
elseif(CONFIG_STD_CPP17)
set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp17>)
elseif(CONFIG_STD_CPP2A)
set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp2a>)
elseif(CONFIG_STD_CPP20)
set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp20>)
elseif(CONFIG_STD_CPP2B)
set(STD_CPP_DIALECT_FLAGS $<TARGET_PROPERTY:compiler-cpp,dialect_cpp2b>)
else()
assert(0 "Unreachable code. Expected C++ standard to have been chosen. See Kconfig.zephyr.")
endif()
zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:${STD_CPP_DIALECT_FLAGS}>)
endif()
if(NOT CONFIG_EXCEPTIONS)
# @Intent: Obtain compiler specific flags related to C++ Exceptions
zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:$<TARGET_PROPERTY:compiler-cpp,no_exceptions>>)
endif()
if(NOT CONFIG_RTTI)
# @Intent: Obtain compiler specific flags related to C++ Run Time Type Information
zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:$<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> ${AUTOCONF_H}")
# @Intent: Set compiler specific flag for bare metal freestanding option
zephyr_compile_options($<TARGET_PROPERTY:compiler,freestanding>)
# @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_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 correspondance to match Zephyr usage.
# (must be after compiler specific flags)
if(NOT CONFIG_ARCH_POSIX)
# `zephyr_stdint.h` is not included for the POSIX (native) arch because it
# compiles with the host toolchain/headers and there can be conflicts if we
# arbitrarily redefine our own type system (see #37718).
zephyr_compile_options("SHELL: $<TARGET_PROPERTY:compiler,imacros> ${ZEPHYR_BASE}/include/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_APPLICATION)
# @Intent: Set linker specific flags for bare metal target
toolchain_ld_baremetal()
endif()
if(CONFIG_LIB_CPLUSPLUS)
# @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>>)
# 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)
zephyr_cc_option(-fno-pie)
zephyr_cc_option(-fno-pic)
zephyr_cc_option(-fno-strict-overflow)
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")
# GCC assumed
zephyr_cc_option(-fno-reorder-functions)
if(NOT ${ZEPHYR_TOOLCHAIN_VARIANT} STREQUAL "xcc")
zephyr_cc_option(-fno-defer-pop)
endif()
endif()
zephyr_cc_option_ifdef(CONFIG_STACK_USAGE -fstack-usage)
# If the compiler supports it, strip the ${ZEPHYR_BASE} prefix from the
# __FILE__ macro used in __ASSERT*, in the
# .noinit."/home/joe/zephyr/fu/bar.c" section names and in any
# application code. This saves some memory, stops leaking user locations
# in binaries, makes failure logs more deterministic and most
# importantly makes builds more deterministic
# If several match then the last one wins. This matters for instances
# like tests/ and samples/: they're inside all of them! Then let's
# strip as little as possible.
zephyr_cc_option(-fmacro-prefix-map=${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()
# 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()
get_property(TOPT GLOBAL PROPERTY TOPT)
set_ifndef( TOPT -Wl,-T) # clang doesn't pick -T for some reason and complains,
# while -Wl,-T works for both, gcc and clang
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})
assert_exists(CONFIG_CUSTOM_LINKER_SCRIPT)
endif()
else()
# Try a board specific linker file
set(LINKER_SCRIPT ${BOARD_DIR}/linker.ld)
if(NOT EXISTS ${LINKER_SCRIPT})
# If not available, try an SoC specific linker file
set(LINKER_SCRIPT ${SOC_DIR}/${ARCH}/${SOC_PATH}/linker.ld)
endif()
endif()
if(NOT EXISTS ${LINKER_SCRIPT})
message(FATAL_ERROR "Could not find linker script: '${LINKER_SCRIPT}'. Corrupted configuration?")
endif()
configure_file(version.h.in ${PROJECT_BINARY_DIR}/include/generated/version.h)
# Error-out when the deprecated naming convention is found (until
# after 1.14.0 has been released)
foreach(path
${BOARD_DIR}/dts.fixup
${PROJECT_SOURCE_DIR}/soc/${ARCH}/${SOC_PATH}/dts.fixup
${APPLICATION_SOURCE_DIR}/dts.fixup
)
if(EXISTS ${path})
message(FATAL_ERROR
"A deprecated filename has been detected. Porting is required."
"The file '${path}' exists, but it should be named dts_fixup.h instead."
"See https://github.com/zephyrproject-rtos/zephyr/pull/10352 for more details"
)
endif()
endforeach()
set_ifndef( DTS_BOARD_FIXUP_FILE ${BOARD_DIR}/dts_fixup.h)
set_ifndef( DTS_SOC_FIXUP_FILE ${SOC_DIR}/${ARCH}/${SOC_PATH}/dts_fixup.h)
set( DTS_APP_FIXUP_FILE ${APPLICATION_SOURCE_DIR}/dts_fixup.h)
set_ifndef(DTS_CAT_OF_FIXUP_FILES ${ZEPHYR_BINARY_DIR}/include/generated/devicetree_fixups.h)
# Concatenate the fixups into a single header file for easy
# #include'ing
file(WRITE ${DTS_CAT_OF_FIXUP_FILES} "/* May only be included by devicetree.h */\n\n")
set(DISCOVERED_FIXUP_FILES)
foreach(fixup_file
${DTS_BOARD_FIXUP_FILE}
${DTS_SOC_FIXUP_FILE}
${DTS_APP_FIXUP_FILE}
${shield_dts_fixups}
)
if(EXISTS ${fixup_file})
file(READ ${fixup_file} contents)
file(APPEND ${DTS_CAT_OF_FIXUP_FILES} "${contents}")
string(APPEND DISCOVERED_FIXUP_FILES "- ${fixup_file}\n")
endif()
endforeach()
if (DISCOVERED_FIXUP_FILES)
message(WARNING "One or more dts_fixup.h files detected:\n${DISCOVERED_FIXUP_FILES}Use of these files is deprecated; use the devicetree.h API instead.")
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)
if(EXISTS ${SOC_DIR}/${ARCH}/CMakeLists.txt)
add_subdirectory(${SOC_DIR}/${ARCH} soc/${ARCH})
else()
add_subdirectory(${SOC_DIR}/${ARCH}/${SOC_PATH} soc/${ARCH}/${SOC_PATH})
endif()
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_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 ZEPHYR_CURRENT_MODULE_DIR and ZEPHYR_CURRENT_CMAKE_DIR.
set(ZEPHYR_CURRENT_MODULE_DIR)
set(ZEPHYR_CURRENT_CMAKE_DIR)
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/subfolder_list.py
--directory ${ZEPHYR_BASE}/include # Walk this directory
--out-file ${syscalls_subdirs_txt} # Write file with discovered folder
--trigger ${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/subfolder_list.py
--directory ${ZEPHYR_BASE}/include # Walk this directory
--out-file ${syscalls_subdirs_txt} # Write file with discovered folder
--trigger ${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)
endif()
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/parse_syscalls.py
--include ${ZEPHYR_BASE}/include # Read files from this dir
--include ${ZEPHYR_BASE}/drivers # For net sockets
--include ${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
DEPENDS ${syscalls_subdirs_trigger} ${PARSE_SYSCALLS_HEADER_DEPENDS}
)
add_custom_target(${SYSCALL_LIST_H_TARGET} DEPENDS ${syscall_list_h})
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)
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/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-list ${syscall_list_h}
${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 ${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/gen_kobject_list.py
--validation-output ${DRV_VALIDATION}
${gen_kobject_list_include_args}
$<$<BOOL:${CMAKE_VERBOSE_MAKEFILE}>:--verbose>
DEPENDS
${ZEPHYR_BASE}/scripts/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
)
# 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
)
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/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)
# 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()
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_GEN_ISR_TABLES)
if(CONFIG_GEN_SW_ISR_TABLE)
list(APPEND GEN_ISR_TABLE_EXTRA_ARG --sw-isr-table)
endif()
if(CONFIG_GEN_IRQ_VECTOR_TABLE)
list(APPEND GEN_ISR_TABLE_EXTRA_ARG --vector-table)
endif()
# isr_tables.c is generated from ${ZEPHYR_PREBUILT_EXECUTABLE} by
# gen_isr_tables.py
add_custom_command(
OUTPUT isr_tables.c isrList.bin
COMMAND $<TARGET_PROPERTY:bintools,elfconvert_command>
$<TARGET_PROPERTY:bintools,elfconvert_flag>
$<TARGET_PROPERTY:bintools,elfconvert_flag_intarget>${OUTPUT_FORMAT}
$<TARGET_PROPERTY:bintools,elfconvert_flag_outtarget>binary
$<TARGET_PROPERTY:bintools,elfconvert_flag_section_only>.intList
$<TARGET_PROPERTY:bintools,elfconvert_flag_infile>$<TARGET_FILE:${ZEPHYR_PREBUILT_EXECUTABLE}>
$<TARGET_PROPERTY:bintools,elfconvert_flag_outfile>isrList.bin
$<TARGET_PROPERTY:bintools,elfconvert_flag_final>
COMMAND ${PYTHON_EXECUTABLE}
${ZEPHYR_BASE}/arch/common/gen_isr_tables.py
--output-source isr_tables.c
--kernel $<TARGET_FILE:${ZEPHYR_PREBUILT_EXECUTABLE}>
--intlist isrList.bin
$<$<BOOL:${CONFIG_BIG_ENDIAN}>:--big-endian>
$<$<BOOL:${CMAKE_VERBOSE_MAKEFILE}>:--debug>
${GEN_ISR_TABLE_EXTRA_ARG}
DEPENDS ${ZEPHYR_PREBUILT_EXECUTABLE}
COMMAND_EXPAND_LISTS
)
set_property(GLOBAL APPEND PROPERTY GENERATED_KERNEL_SOURCE_FILES isr_tables.c)
endif()
if(CONFIG_HAS_DTS)
# dev_handles.c is generated from ${ZEPHYR_PREBUILT_EXECUTABLE} by
# gen_handles.py
add_custom_command(
OUTPUT dev_handles.c
COMMAND
${PYTHON_EXECUTABLE}
${ZEPHYR_BASE}/scripts/gen_handles.py
--output-source dev_handles.c
--kernel $<TARGET_FILE:${ZEPHYR_PREBUILT_EXECUTABLE}>
--zephyr-base ${ZEPHYR_BASE}
--start-symbol "$<TARGET_PROPERTY:linker,devices_start_symbol>"
DEPENDS ${ZEPHYR_PREBUILT_EXECUTABLE}
)
set_property(GLOBAL APPEND PROPERTY GENERATED_KERNEL_SOURCE_FILES dev_handles.c)
endif()
if(CONFIG_CODE_DATA_RELOCATION)
# @Intent: Linker script to relocate .text, data and .bss sections
toolchain_ld_relocation()
endif()
if(CONFIG_USERSPACE)
zephyr_get_compile_options_for_lang_as_string(C compiler_flags_priv)
string(REPLACE "$<TARGET_PROPERTY:compiler,coverage>" ""
NO_COVERAGE_FLAGS "${compiler_flags_priv}"
)
get_property(include_dir_in_interface TARGET zephyr_interface
PROPERTY INTERFACE_INCLUDE_DIRECTORIES)
get_property(sys_include_dir_in_interface TARGET zephyr_interface
PROPERTY INTERFACE_SYSTEM_INCLUDE_DIRECTORIES)
get_property(compile_definitions_interface TARGET zephyr_interface
PROPERTY INTERFACE_COMPILE_DEFINITIONS)
set(GEN_KOBJ_LIST ${ZEPHYR_BASE}/scripts/gen_kobject_list.py)
set(PROCESS_GPERF ${ZEPHYR_BASE}/scripts/process_gperf.py)
set(KOBJECT_HASH_LIST kobject_hash.gperf)
set(KOBJECT_HASH_OUTPUT_SRC_PRE kobject_hash_preprocessed.c)
set(KOBJECT_HASH_OUTPUT_SRC kobject_hash.c)
set(KOBJECT_HASH_OUTPUT_OBJ kobject_hash.c.obj)
set(KOBJECT_HASH_OUTPUT_OBJ_RENAMED kobject_hash_renamed.o)
# Essentially what we are doing here is extracting some information
# out of the nearly finished elf file, generating the source code
# for a hash table based on that information, and then compiling and
# linking the hash table back into a now even more nearly finished
# elf file. More information in gen_kobject_list.py --help.
# Use the script GEN_KOBJ_LIST to scan the kernel binary's
# (${ZEPHYR_PREBUILT_EXECUTABLE}) DWARF information to produce a table of kernel
# objects (KOBJECT_HASH_LIST) which we will then pass to gperf
add_custom_command(
OUTPUT ${KOBJECT_HASH_LIST}
COMMAND
${PYTHON_EXECUTABLE}
${GEN_KOBJ_LIST}
--kernel $<TARGET_FILE:${ZEPHYR_PREBUILT_EXECUTABLE}>
--gperf-output ${KOBJECT_HASH_LIST}
${gen_kobject_list_include_args}
$<$<BOOL:${CMAKE_VERBOSE_MAKEFILE}>:--verbose>
DEPENDS
${ZEPHYR_PREBUILT_EXECUTABLE}
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
)
add_custom_target(
kobj_hash_list
DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${KOBJECT_HASH_LIST}
)
# Use gperf to generate C code (KOBJECT_HASH_OUTPUT_SRC_PRE) which implements a
# perfect hashtable based on KOBJECT_HASH_LIST
add_custom_command(
OUTPUT ${KOBJECT_HASH_OUTPUT_SRC_PRE}
COMMAND
${GPERF}
--output-file ${KOBJECT_HASH_OUTPUT_SRC_PRE}
--multiple-iterations 10
${KOBJECT_HASH_LIST}
DEPENDS kobj_hash_list ${KOBJECT_HASH_LIST}
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
)
add_custom_target(
kobj_hash_output_src_pre
DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${KOBJECT_HASH_OUTPUT_SRC_PRE}
)
# For our purposes the code/data generated by gperf is not optimal.
#
# The script PROCESS_GPERF creates a new c file KOBJECT_HASH_OUTPUT_SRC based on
# KOBJECT_HASH_OUTPUT_SRC_PRE to greatly reduce the amount of code/data generated
# since we know we are always working with pointer values
add_custom_command(
OUTPUT ${KOBJECT_HASH_OUTPUT_SRC}
COMMAND
${PYTHON_EXECUTABLE}
${PROCESS_GPERF}
-i ${KOBJECT_HASH_OUTPUT_SRC_PRE}
-o ${KOBJECT_HASH_OUTPUT_SRC}
-p "struct z_object"
$<$<BOOL:${CMAKE_VERBOSE_MAKEFILE}>:--verbose>
DEPENDS kobj_hash_output_src_pre ${KOBJECT_HASH_OUTPUT_SRC_PRE}
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
)
add_custom_target(
kobj_hash_output_src
DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${KOBJECT_HASH_OUTPUT_SRC}
)
# We need precise control of where generated text/data ends up in the final
# kernel image. Disable function/data sections and use objcopy to move
# generated data into special section names
add_library(
kobj_hash_output_lib
STATIC ${CMAKE_CURRENT_BINARY_DIR}/${KOBJECT_HASH_OUTPUT_SRC}
)
set_source_files_properties(${KOBJECT_HASH_OUTPUT_SRC}
PROPERTIES COMPILE_FLAGS
"${NO_COVERAGE_FLAGS} -fno-function-sections -fno-data-sections")
set_source_files_properties(${KOBJECT_HASH_OUTPUT_SRC}
PROPERTIES COMPILE_DEFINITIONS "${compile_definitions_interface}")
# Turn off -ffunction-sections, etc.
# NB: Using a library instead of target_compile_options(kobj_hash_output_lib
# [...]) because a library's options have precedence
add_library(kobj_hash_output_lib_interface INTERFACE)
target_link_libraries(kobj_hash_output_lib kobj_hash_output_lib_interface)
foreach(incl ${include_dir_in_interface})
target_include_directories(kobj_hash_output_lib_interface INTERFACE ${incl})
endforeach()
foreach(incl ${sys_include_dir_in_interface})
target_include_directories(kobj_hash_output_lib_interface SYSTEM INTERFACE ${incl})
endforeach()
set(
KOBJECT_HASH_OUTPUT_OBJ_PATH
${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/kobj_hash_output_lib.dir/${KOBJECT_HASH_OUTPUT_OBJ}
)
add_custom_command(
OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${KOBJECT_HASH_OUTPUT_OBJ_RENAMED}
COMMAND $<TARGET_PROPERTY:bintools,elfconvert_command>
$<TARGET_PROPERTY:bintools,elfconvert_flag>
$<TARGET_PROPERTY:bintools,elfconvert_flag_section_rename>.data=.kobject_data.data
$<TARGET_PROPERTY:bintools,elfconvert_flag_section_rename>.sdata=.kobject_data.sdata
$<TARGET_PROPERTY:bintools,elfconvert_flag_section_rename>.text=.kobject_data.text
$<TARGET_PROPERTY:bintools,elfconvert_flag_section_rename>.rodata=.kobject_data.rodata
$<TARGET_PROPERTY:bintools,elfconvert_flag_infile>${KOBJECT_HASH_OUTPUT_OBJ_PATH}
$<TARGET_PROPERTY:bintools,elfconvert_flag_outfile>${KOBJECT_HASH_OUTPUT_OBJ_RENAMED}
$<TARGET_PROPERTY:bintools,elfconvert_flag_final>
DEPENDS kobj_hash_output_lib
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
COMMAND_EXPAND_LISTS
)
add_custom_target(
kobj_hash_output_obj_renamed
DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${KOBJECT_HASH_OUTPUT_OBJ_RENAMED}
)
add_library(kobj_hash_output_obj_renamed_lib STATIC IMPORTED GLOBAL)
set_property(
TARGET kobj_hash_output_obj_renamed_lib
PROPERTY
IMPORTED_LOCATION ${CMAKE_CURRENT_BINARY_DIR}/${KOBJECT_HASH_OUTPUT_OBJ_RENAMED}
)
add_dependencies(
kobj_hash_output_obj_renamed_lib
kobj_hash_output_obj_renamed
)
set_property(
GLOBAL APPEND PROPERTY
GENERATED_KERNEL_OBJECT_FILES kobj_hash_output_obj_renamed_lib
)
endif()
# Read global variables into local variables
get_property(GKOF GLOBAL PROPERTY GENERATED_KERNEL_OBJECT_FILES)
get_property(GKSF GLOBAL PROPERTY GENERATED_KERNEL_SOURCE_FILES)
get_property(CSTD GLOBAL PROPERTY CSTD)
set_ifndef(CSTD c99)
# @Intent: Obtain compiler specific flag for specifying the c standard
zephyr_compile_options(
$<$<COMPILE_LANGUAGE:C>:$<TARGET_PROPERTY:compiler,cstd>${CSTD}>
)
# @Intent: Configure linker scripts, i.e. generate linker scripts with variables substituted
toolchain_ld_configure_files()
if(CONFIG_USERSPACE)
set(APP_SMEM_ALIGNED_LD "${PROJECT_BINARY_DIR}/include/generated/app_smem_aligned.ld")
set(APP_SMEM_UNALIGNED_LD "${PROJECT_BINARY_DIR}/include/generated/app_smem_unaligned.ld")
if(CONFIG_LINKER_USE_PINNED_SECTION)
set(APP_SMEM_PINNED_ALIGNED_LD
"${PROJECT_BINARY_DIR}/include/generated/app_smem_pinned_aligned.ld")
set(APP_SMEM_PINNED_UNALIGNED_LD
"${PROJECT_BINARY_DIR}/include/generated/app_smem_pinned_unaligned.ld")
if(NOT CONFIG_LINKER_GENERIC_SECTIONS_PRESENT_AT_BOOT)
# The libc partition may hold symbols that are required during boot process,
# for example, stack guard (if enabled). So the libc partition must be pinned
# if not sections are in physical memory at boot, as the paging mechanism is
# only initialized post-kernel.