122 lines
4.2 KiB
CMake
122 lines
4.2 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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# LLVM will use a default sysroot for selection of the C library. The default
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# C library sysroot was defined at built time of clang/LLVM.
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#
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# For example, LLVM for Arm comes pre-built with Picolibc, and thus no flags
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# are required for selecting Picolibc.
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#
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# Other clang/LLVM distributions may come with other pre-built C libraries.
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# clang/LLVM supports using an alternative C library, either by direct linking,
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# or by specifying '--sysroot <path>'.
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#
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# LLVM for Arm provides a 'newlib.cfg' file for newlib C selection.
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# Let us support this principle by looking for a dedicated 'newlib.cfg' or
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# 'picolibc.cfg' and specify '--config <spec>.cfg' if such a file is found.
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# If no cfg-file matching the chosen C implementation, then we assume that the
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# chosen C implementation is identical to the default C library used be the
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# toolchain.
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if(CONFIG_NEWLIB_LIBC)
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file(GLOB_RECURSE newlib_cfg ${LLVM_TOOLCHAIN_PATH}/newlib.cfg)
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if(newlib_cfg)
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list(GET newlib_cfg 0 newlib_cfg)
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set_linker_property(PROPERTY c_library "--config=${newlib_cfg};-lc")
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list(APPEND CMAKE_REQUIRED_FLAGS --config=${newlib_cfg})
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list(APPEND TOOLCHAIN_C_FLAGS --config=${newlib_cfg})
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endif()
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endif()
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if(CONFIG_PICOLIBC)
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file(GLOB_RECURSE picolibc_cfg ${LLVM_TOOLCHAIN_PATH}/picolibc.cfg)
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if(picolibc_cfg)
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list(GET picolibc_cfg 0 picolibc_cfg)
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set_linker_property(PROPERTY c_library "--config=${picolibc_cfg};-lc")
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list(APPEND CMAKE_REQUIRED_FLAGS --config=${picolibc_cfg})
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list(APPEND TOOLCHAIN_C_FLAGS --config=${picolibc_cfg})
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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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