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Kernel: Add a CMake flag to enable LTO for the kernel

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Gunnar Beutner 2021-04-29 15:25:31 +02:00 • committed by Andreas Kling
parent 55ae52fdf8
commit 6288ae2c37
2 changed files with 8 additions and 2 deletions
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5
CMakeLists.txt
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@ -27,6 +27,7 @@ option(ENABLE_COMPILETIME_FORMAT_CHECK "Enable compiletime format string checks"
option(ENABLE_PCI_IDS_DOWNLOAD "Enable download of the pci.ids database at build time" ON) option(ENABLE_PCI_IDS_DOWNLOAD "Enable download of the pci.ids database at build time" ON)
option(BUILD_LAGOM "Build parts of the system targeting the host OS for fuzzing/testing" OFF) option(BUILD_LAGOM "Build parts of the system targeting the host OS for fuzzing/testing" OFF)
option(PRECOMPILE_COMMON_HEADERS "Precompile some common headers to speedup compilation" OFF) option(PRECOMPILE_COMMON_HEADERS "Precompile some common headers to speedup compilation" OFF)
option(ENABLE_KERNEL_LTO "Build the kernel with link-time optimization" OFF)
add_custom_target(run add_custom_target(run
COMMAND ${CMAKE_SOURCE_DIR}/Meta/run.sh COMMAND ${CMAKE_SOURCE_DIR}/Meta/run.sh
@ -124,9 +125,9 @@ else()
set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PREFIX}g++) set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PREFIX}g++)
set(CMAKE_ASM_COMPILER ${TOOLCHAIN_PREFIX}gcc) set(CMAKE_ASM_COMPILER ${TOOLCHAIN_PREFIX}gcc)
set(CMAKE_LINKER ${TOOLCHAIN_PREFIX}ld) set(CMAKE_LINKER ${TOOLCHAIN_PREFIX}ld)
set(CMAKE_RANLIB ${TOOLCHAIN_PREFIX}ranlib) set(CMAKE_RANLIB ${TOOLCHAIN_PREFIX}gcc-ranlib)
set(CMAKE_STRIP ${TOOLCHAIN_PREFIX}strip) set(CMAKE_STRIP ${TOOLCHAIN_PREFIX}strip)
set(CMAKE_AR ${TOOLCHAIN_PREFIX}ar) set(CMAKE_AR ${TOOLCHAIN_PREFIX}gcc-ar)
endif() endif()
foreach(lang ASM C CXX OBJC OBJCXX) foreach(lang ASM C CXX OBJC OBJCXX)

5
Kernel/CMakeLists.txt
View file

@ -361,6 +361,11 @@ else()
endif() endif()
add_executable(Kernel ${SOURCES}) add_executable(Kernel ${SOURCES})
if (ENABLE_KERNEL_LTO)
include(CheckIPOSupported)
check_ipo_supported()
set_property(TARGET Kernel PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
endif()
target_link_libraries(Kernel kernel_heap gcc stdc++) target_link_libraries(Kernel kernel_heap gcc stdc++)
add_dependencies(Kernel boot kernel_heap) add_dependencies(Kernel boot kernel_heap)
install(TARGETS Kernel RUNTIME DESTINATION boot) install(TARGETS Kernel RUNTIME DESTINATION boot)