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buildsystem: Add an option to enable LTO

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This commit adds option to enable Link Time Optimization.

Signed-off-by: Radosław Koppel <radoslaw.koppel@nordicsemi.no>
This commit is contained in:
Radoslaw Koppel 2024-01-30 12:32:32 +01:00 committed by Carles Cufí
parent 3799b93689
commit 26c8776c70
5 changed files with 28 additions and 2 deletions
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9
CMakeLists.txt
View file

@ -213,6 +213,11 @@ endif()
# Apply the final optimization flag(s)
zephyr_compile_options(${OPTIMIZATION_FLAG})
if(CONFIG_LTO)
add_compile_options($<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>>)
@ -805,6 +810,10 @@ 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}

7
Kconfig.zephyr
View file

@ -428,6 +428,13 @@ config NO_OPTIMIZATIONS
default stack sizes in order to avoid stack overflows.
endchoice
config LTO
bool "Link Time Optimization [EXPERIMENTAL]"
depends on !(GEN_ISR_TABLES || GEN_IRQ_VECTOR_TABLE) || ISR_TABLES_LOCAL_DECLARATION
select EXPERIMENTAL
help
This option enables Link Time Optimization.
config COMPILER_WARNINGS_AS_ERRORS
bool "Treat warnings as errors"
help

5
cmake/bintools/gnu/target.cmake
View file

@ -5,8 +5,13 @@
find_program(CMAKE_OBJCOPY ${CROSS_COMPILE}objcopy PATHS ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
find_program(CMAKE_OBJDUMP ${CROSS_COMPILE}objdump PATHS ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
find_program(CMAKE_AS ${CROSS_COMPILE}as PATHS ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
if(CONFIG_LTO)
find_program(CMAKE_AR ${CROSS_COMPILE}gcc-ar PATHS ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
find_program(CMAKE_RANLIB ${CROSS_COMPILE}gcc-ranlib PATHS ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
else()
find_program(CMAKE_AR ${CROSS_COMPILE}ar PATHS ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
find_program(CMAKE_RANLIB ${CROSS_COMPILE}ranlib PATHS ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
endif()
find_program(CMAKE_READELF ${CROSS_COMPILE}readelf PATHS ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
find_program(CMAKE_NM ${CROSS_COMPILE}nm PATHS ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
find_program(CMAKE_STRIP ${CROSS_COMPILE}strip PATHS ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)

3
cmake/compiler/gcc/compiler_flags.cmake
View file

@ -21,6 +21,9 @@ endif()
set_compiler_property(PROPERTY optimization_speed -O2)
set_compiler_property(PROPERTY optimization_size -Os)
set_compiler_property(PROPERTY optimization_lto -flto)
set_compiler_property(PROPERTY prohibit_lto -fno-lto)
#######################################################
# This section covers flags related to warning levels #
#######################################################

2
cmake/linker/ld/linker_flags.cmake
View file

@ -12,6 +12,8 @@ endif()
set_property(TARGET linker PROPERTY partial_linking "-r")
set_property(TARGET linker PROPERTY lto_arguments -flto -fno-ipa-sra -ffunction-sections -fdata-sections)
# Some linker flags might not be purely ld specific, but a combination of
# linker and compiler, such as:
# --coverage for clang