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cmake: llvm: use lld
Use lld linker instead of ld. Signed-off-by: Anas Nashif <[email protected]>
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‎cmake/linker/lld/target.cmake‎

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# SPDX-License-Identifier: Apache-2.0
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find_program(CMAKE_LINKER ld.lld )
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set_ifndef(LINKERFLAGPREFIX -Wl)
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# Run $LINKER_SCRIPT file through the C preprocessor, producing ${linker_script_gen}
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# NOTE: ${linker_script_gen} will be produced at build-time; not at configure-time
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macro(configure_linker_script linker_script_gen linker_pass_define)
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set(extra_dependencies ${ARGN})
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# Different generators deal with depfiles differently.
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if(CMAKE_GENERATOR STREQUAL "Unix Makefiles")
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# Note that the IMPLICIT_DEPENDS option is currently supported only
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# for Makefile generators and will be ignored by other generators.
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set(linker_script_dep IMPLICIT_DEPENDS C ${LINKER_SCRIPT})
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elseif(CMAKE_GENERATOR STREQUAL "Ninja")
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# Using DEPFILE with other generators than Ninja is an error.
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set(linker_script_dep DEPFILE ${PROJECT_BINARY_DIR}/${linker_script_gen}.dep)
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else()
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# TODO: How would the linker script dependencies work for non-linker
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# script generators.
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message(STATUS "Warning; this generator is not well supported. The
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Linker script may not be regenerated when it should.")
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set(linker_script_dep "")
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endif()
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zephyr_get_include_directories_for_lang(C current_includes)
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get_filename_component(base_name ${CMAKE_CURRENT_BINARY_DIR} NAME)
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get_property(current_defines GLOBAL PROPERTY PROPERTY_LINKER_SCRIPT_DEFINES)
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add_custom_command(
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OUTPUT ${linker_script_gen}
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DEPENDS
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${LINKER_SCRIPT}
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${extra_dependencies}
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# NB: 'linker_script_dep' will use a keyword that ends 'DEPENDS'
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${linker_script_dep}
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COMMAND ${CMAKE_C_COMPILER}
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-x assembler-with-cpp
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${NOSYSDEF_CFLAG}
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-MD -MF ${linker_script_gen}.dep -MT ${base_name}/${linker_script_gen}
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-D_LINKER
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-D_ASMLANGUAGE
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${current_includes}
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${current_defines}
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${linker_pass_define}
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-E ${LINKER_SCRIPT}
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-P # Prevent generation of debug `#line' directives.
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-o ${linker_script_gen}
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VERBATIM
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WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
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COMMAND_EXPAND_LISTS
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)
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endmacro()
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# Force symbols to be entered in the output file as undefined symbols
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function(toolchain_ld_force_undefined_symbols)
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foreach(symbol ${ARGN})
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zephyr_link_libraries(${LINKERFLAGPREFIX},-u,${symbol})
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endforeach()
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endfunction()
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# Link a target to given libraries with toolchain-specific argument order
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#
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# Usage:
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# toolchain_ld_link_elf(
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# TARGET_ELF <target_elf>
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# OUTPUT_MAP <output_map_file_of_target>
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# LIBRARIES_PRE_SCRIPT [libraries_pre_script]
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# LINKER_SCRIPT <linker_script>
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# LIBRARIES_POST_SCRIPT [libraries_post_script]
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# DEPENDENCIES [dependencies]
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# )
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function(toolchain_ld_link_elf)
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cmake_parse_arguments(
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TOOLCHAIN_LD_LINK_ELF # prefix of output variables
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"" # list of names of the boolean arguments
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"TARGET_ELF;OUTPUT_MAP;LINKER_SCRIPT" # list of names of scalar arguments
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"LIBRARIES_PRE_SCRIPT;LIBRARIES_POST_SCRIPT;DEPENDENCIES" # list of names of list arguments
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${ARGN} # input args to parse
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)
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target_link_libraries(
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${TOOLCHAIN_LD_LINK_ELF_TARGET_ELF}
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${TOOLCHAIN_LD_LINK_ELF_LIBRARIES_PRE_SCRIPT}
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${TOPT}
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${TOOLCHAIN_LD_LINK_ELF_LINKER_SCRIPT}
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${TOOLCHAIN_LD_LINK_ELF_LIBRARIES_POST_SCRIPT}
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${LINKERFLAGPREFIX},-Map=${TOOLCHAIN_LD_LINK_ELF_OUTPUT_MAP}
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${LINKERFLAGPREFIX},--whole-archive
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${ZEPHYR_LIBS_PROPERTY}
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${LINKERFLAGPREFIX},--no-whole-archive
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kernel
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$<TARGET_OBJECTS:${OFFSETS_LIB}>
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${LIB_INCLUDE_DIR}
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-L${PROJECT_BINARY_DIR}
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${TOOLCHAIN_LIBS}
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${TOOLCHAIN_LD_LINK_ELF_DEPENDENCIES}
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)
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endfunction(toolchain_ld_link_elf)
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# Load toolchain_ld-family macros
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include(${ZEPHYR_BASE}/cmake/linker/ld/target_base.cmake)
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include(${ZEPHYR_BASE}/cmake/linker/${LINKER}/target_baremetal.cmake)
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include(${ZEPHYR_BASE}/cmake/linker/ld/target_cpp.cmake)
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include(${ZEPHYR_BASE}/cmake/linker/ld/target_relocation.cmake)
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include(${ZEPHYR_BASE}/cmake/linker/ld/target_configure.cmake)

‎cmake/linker/lld/target_baremetal.cmake‎

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# SPDX-License-Identifier: Apache-2.0
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# See root CMakeLists.txt for description and expectations of these macros
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macro(toolchain_ld_baremetal)
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# LINKERFLAGPREFIX comes from linker/ld/target.cmake
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zephyr_ld_options(
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-nostdlib
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-static
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${LINKERFLAGPREFIX},-X
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${LINKERFLAGPREFIX},-N
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)
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# Funny thing is if this is set to =error, some architectures will
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# skip this flag even though the compiler flag check passes
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# (e.g. ARC and Xtensa). So warning should be the default for now.
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#
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# Skip this for native application as Zephyr only provides
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# additions to the host toolchain linker script. The relocation
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# sections (.rel*) requires us to override those provided
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# by host toolchain. As we can't account for all possible
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# combination of compiler and linker on all machines used
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# for development, it is better to turn this off.
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#
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# CONFIG_LINKER_ORPHAN_SECTION_PLACE is to place the orphan sections
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# without any warnings or errors, which is the default behavior.
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# So there is no need to explicitly set a linker flag.
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if(CONFIG_LINKER_ORPHAN_SECTION_WARN)
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zephyr_ld_options(
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${LINKERFLAGPREFIX},--orphan-handling=warn
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)
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elseif(CONFIG_LINKER_ORPHAN_SECTION_ERROR)
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zephyr_ld_options(
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${LINKERFLAGPREFIX},--orphan-handling=error
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)
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endif()
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endmacro()

‎cmake/toolchain/llvm/generic.cmake‎

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set(LLVM_TOOLCHAIN_PATH ${CLANG_ROOT_DIR} CACHE PATH "clang install directory")
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set(COMPILER clang)
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set(LINKER ld) # TODO: Use lld eventually rather than GNU ld
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set(LINKER lld)
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set(BINTOOLS llvm)
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if("${ARCH}" STREQUAL "arm")

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