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Meta: Add Clang support to the CMake build scripts

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This commit is contained in:
Daniel Bertalan 2021-07-13 16:43:45 +02:00 • committed by Andreas Kling
parent 15e217ea68
commit 13e3df41de
7 changed files with 128 additions and 22 deletions
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39
Kernel/CMakeLists.txt
View file

@ -349,19 +349,32 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mno-80387 -mno-mmx -mno-sse -mno-sse2")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-asynchronous-unwind-tables")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fstack-protector-strong")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-exceptions")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -nodefaultlibs -nostdlib -nostdinc -nostdinc++")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -nodefaultlibs -nostdlib")
# Apply any flags that are only available on >= GCC 11.1
if (CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 11.1)
if (NOT USE_CLANG_TOOLCHAIN AND CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 11.1)
# Zero any registers used within a function on return (to reduce data lifetime and ROP gadgets).
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fzero-call-used-regs=used-gpr")
endif()
if (NOT USE_CLANG_TOOLCHAIN)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -nostdinc -nostdinc++")
endif()
macro (set_new_alignment alignment)
if (USE_CLANG_TOOLCHAIN)
add_compile_options(-faligned-allocation)
add_compile_options(-fnew-alignment=${alignment})
else()
add_compile_options(-faligned-new=${alignment})
endif()
endmacro()
if ("${SERENITY_ARCH}" STREQUAL "x86_64")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mcmodel=large -mno-red-zone")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -faligned-new=8")
set_new_alignment(8)
else()
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -faligned-new=4")
set_new_alignment(4)
endif()
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -static-pie")
@ -412,16 +425,26 @@ add_compile_definitions(KERNEL)
# It's needed because CLion doesn't understand the way we switch compilers mid-build.
add_compile_definitions(__serenity__)
if (USE_CLANG_TOOLCHAIN)
add_link_options(LINKER:-z,notext)
add_link_options(LINKER:--build-id=none)
endif()
add_library(kernel_heap STATIC ${KERNEL_HEAP_SOURCES})
if (${CMAKE_HOST_SYSTEM_NAME} MATCHES SerenityOS)
include_directories(/usr/local/include/c++/${GCC_VERSION}/)
elseif (USE_CLANG_TOOLCHAIN)
include_directories("${TOOLCHAIN_ROOT}/include/c++/v1")
else()
if (NOT EXISTS ${TOOLCHAIN_ROOT}/${SERENITY_ARCH}-pc-serenity/include/c++/${GCC_VERSION}/)
message(FATAL_ERROR "Toolchain version ${GCC_VERSION} appears to be missing! Please run: Meta/serenity.sh rebuild-toolchain")
endif()
include_directories(${TOOLCHAIN_ROOT}/${SERENITY_ARCH}-pc-serenity/include/c++/${GCC_VERSION}/)
include_directories(${TOOLCHAIN_ROOT}/${SERENITY_ARCH}-pc-serenity/include/c++/${GCC_VERSION}/${SERENITY_ARCH}-pc-serenity/)
endif()
if (NOT USE_CLANG_TOOLCHAIN)
link_directories(${TOOLCHAIN_ROOT}/${SERENITY_ARCH}-pc-serenity/lib)
link_directories(${TOOLCHAIN_ROOT}/lib/gcc/${SERENITY_ARCH}-pc-serenity/${GCC_VERSION}/)
endif()
@ -447,7 +470,13 @@ if (ENABLE_KERNEL_LTO)
check_ipo_supported()
set_property(TARGET Kernel PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
endif()
target_link_libraries(Kernel kernel_heap gcc)
if (USE_CLANG_TOOLCHAIN)
target_link_libraries(Kernel kernel_heap clang_rt.builtins-${SERENITY_CLANG_ARCH})
else()
target_link_libraries(Kernel kernel_heap gcc)
endif()
add_dependencies(Kernel kernel_heap)
add_custom_command(

10
Kernel/Prekernel/CMakeLists.txt
View file

@ -18,14 +18,18 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -static")
add_executable(${PREKERNEL_TARGET} ${SOURCES})
target_compile_options(${PREKERNEL_TARGET} PRIVATE -no-pie -fno-pic)
target_link_options(${PREKERNEL_TARGET} PRIVATE LINKER:-T ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld -nostdlib)
target_link_options(${PREKERNEL_TARGET} PRIVATE LINKER:-T ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld -nostdlib LINKER:--no-pie)
set_target_properties(${PREKERNEL_TARGET} PROPERTIES LINK_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld)
target_link_libraries(${PREKERNEL_TARGET} gcc supc++)
if (USE_CLANG_TOOLCHAIN)
target_link_libraries(${PREKERNEL_TARGET} clang_rt.builtins-${SERENITY_CLANG_ARCH} c++abi)
else()
target_link_libraries(${PREKERNEL_TARGET} gcc supc++)
endif()
add_custom_command(
TARGET ${PREKERNEL_TARGET} POST_BUILD
COMMAND ${TOOLCHAIN_PREFIX}objcopy -O elf32-i386 ${CMAKE_CURRENT_BINARY_DIR}/${PREKERNEL_TARGET} ${CMAKE_CURRENT_BINARY_DIR}/Prekernel
COMMAND ${CMAKE_OBJCOPY} -O elf32-i386 ${CMAKE_CURRENT_BINARY_DIR}/${PREKERNEL_TARGET} ${CMAKE_CURRENT_BINARY_DIR}/Prekernel
BYPRODUCTS ${CMAKE_CURRENT_BINARY_DIR}/Prekernel
)