2e3873adde
Zephyr is a bare metal build where standard libs are disabled. This means that c and runtime libraries must manually be linked in. This has generally been handled by using CMake's link libraries handling but the issue with that is both de-duplication but also library link order. Standard libraries must be linked at last location to ensure symbols are always available, however this is not optimal with target_link_libraries() because this would ultimately require every library to know the c library to link with, which is not desired. Therefore, setup standard C and runtime library linking in linker CMake files for toolchains where this is required. This commit expands the principle introduced with toolchain abstraction, see PR#24851. This means that a toolchain implementation may specify standard C, runtime, C++, etc libraries, as well as their link order. Because a property approach is used, then Zephyr modules, such as the Picolibc module can adjust such properties. An optional `zephyr_linker_finalize()` macro is called at the end of Zephyr's CMakeList process and can be used by the toolchain implementation to define the final linker invocation. This aligns the linker handling flow to the principle introduced in PR#24851 and improves the flexibility and robustness of Zephyr build system. Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>
85 lines
2.6 KiB
CMake
85 lines
2.6 KiB
CMake
# SPDX-License-Identifier: Apache-2.0
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# Configuration for host installed clang
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#
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set(NOSTDINC "")
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# Note that NOSYSDEF_CFLAG may be an empty string, and
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# set_ifndef() does not work with empty string.
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if(NOT DEFINED NOSYSDEF_CFLAG)
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set(NOSYSDEF_CFLAG -undef)
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endif()
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if(DEFINED TOOLCHAIN_HOME)
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set(find_program_clang_args PATHS ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
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endif()
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find_program(CMAKE_C_COMPILER clang ${find_program_clang_args})
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find_program(CMAKE_CXX_COMPILER clang++ ${find_program_clang_args})
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if(NOT "${ARCH}" STREQUAL "posix")
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include(${ZEPHYR_BASE}/cmake/gcc-m-cpu.cmake)
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include(${ZEPHYR_BASE}/cmake/gcc-m-fpu.cmake)
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if("${ARCH}" STREQUAL "arm")
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list(APPEND TOOLCHAIN_C_FLAGS
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-fshort-enums
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)
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list(APPEND TOOLCHAIN_LD_FLAGS
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-fshort-enums
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)
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include(${ZEPHYR_BASE}/cmake/compiler/clang/target_arm.cmake)
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elseif("${ARCH}" STREQUAL "arm64")
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include(${ZEPHYR_BASE}/cmake/compiler/clang/target_arm64.cmake)
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elseif("${ARCH}" STREQUAL "riscv")
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include(${ZEPHYR_BASE}/cmake/compiler/gcc/target_riscv.cmake)
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endif()
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if(DEFINED CMAKE_C_COMPILER_TARGET)
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set(clang_target_flag "--target=${CMAKE_C_COMPILER_TARGET}")
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endif()
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foreach(file_name include/stddef.h)
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execute_process(
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COMMAND ${CMAKE_C_COMPILER} --print-file-name=${file_name}
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OUTPUT_VARIABLE _OUTPUT
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)
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get_filename_component(_OUTPUT "${_OUTPUT}" DIRECTORY)
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string(REGEX REPLACE "\n" "" _OUTPUT ${_OUTPUT})
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list(APPEND NOSTDINC ${_OUTPUT})
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endforeach()
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foreach(isystem_include_dir ${NOSTDINC})
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list(APPEND isystem_include_flags -isystem "\"${isystem_include_dir}\"")
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endforeach()
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if(CONFIG_X86)
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if(CONFIG_64BIT)
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list(APPEND TOOLCHAIN_C_FLAGS "-m64")
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else()
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list(APPEND TOOLCHAIN_C_FLAGS "-m32")
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endif()
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endif()
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# This libgcc code is partially duplicated in compiler/*/target.cmake
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execute_process(
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COMMAND ${CMAKE_C_COMPILER} ${clang_target_flag} ${TOOLCHAIN_C_FLAGS}
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--print-libgcc-file-name
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OUTPUT_VARIABLE RTLIB_FILE_NAME
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OUTPUT_STRIP_TRAILING_WHITESPACE
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)
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get_filename_component(RTLIB_DIR ${RTLIB_FILE_NAME} DIRECTORY)
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get_filename_component(RTLIB_NAME_WITH_PREFIX ${RTLIB_FILE_NAME} NAME_WLE)
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string(REPLACE lib "" RTLIB_NAME ${RTLIB_NAME_WITH_PREFIX})
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set_property(TARGET linker PROPERTY lib_include_dir "-L${RTLIB_DIR}")
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set_property(TARGET linker PROPERTY rt_library "-l${RTLIB_NAME}")
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list(APPEND CMAKE_REQUIRED_FLAGS -nostartfiles -nostdlib ${isystem_include_flags})
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string(REPLACE ";" " " CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
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endif()
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