zephyr/cmake/compiler/clang/target.cmake

# Configuration for host installed llvm
#

set(NOSTDINC "")

# Note that NOSYSDEF_CFLAG may be an empty string, and
# set_ifndef() does not work with empty string.
if(NOT DEFINED NOSYSDEF_CFLAG)
  set(NOSYSDEF_CFLAG -undef)
endif()

find_program(CMAKE_C_COMPILER    clang          PATH ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
find_program(CMAKE_CXX_COMPILER  clang++        PATH ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
find_program(CMAKE_AR            llvm-ar        PATH ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
find_program(CMAKE_LINKER        llvm-link      PATH ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
find_program(CMAKE_NM            llvm-nm        PATH ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
find_program(CMAKE_OBJDUMP       llvm-objdump   PATH ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
find_program(CMAKE_RANLIB        llvm-ranlib    PATH ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
find_program(CMAKE_OBJCOPY       objcopy        PATH ${TOOLCHAIN_HOME})
find_program(CMAKE_READELF       readelf        PATH ${TOOLCHAIN_HOME})

foreach(file_name include include-fixed)
  execute_process(
    COMMAND ${CMAKE_C_COMPILER} --print-file-name=${file_name}
    OUTPUT_VARIABLE _OUTPUT
    )
  string(REGEX REPLACE "\n" "" _OUTPUT ${_OUTPUT})

  list(APPEND NOSTDINC ${_OUTPUT})
endforeach()

foreach(isystem_include_dir ${NOSTDINC})
  list(APPEND isystem_include_flags -isystem ${isystem_include_dir})
endforeach()

# This libgcc code is partially duplicated in compiler/*/target.cmake
execute_process(
  COMMAND ${CMAKE_C_COMPILER} ${TOOLCHAIN_C_FLAGS} --print-libgcc-file-name
  OUTPUT_VARIABLE LIBGCC_FILE_NAME
  OUTPUT_STRIP_TRAILING_WHITESPACE
  )

assert_exists(LIBGCC_FILE_NAME)

get_filename_component(LIBGCC_DIR ${LIBGCC_FILE_NAME} DIRECTORY)

assert_exists(LIBGCC_DIR)

list(APPEND LIB_INCLUDE_DIR "-L\"${LIBGCC_DIR}\"")
list(APPEND TOOLCHAIN_LIBS gcc)

set(CMAKE_REQUIRED_FLAGS -nostartfiles -nostdlib ${isystem_include_flags} -Wl,--unresolved-symbols=ignore-in-object-files)
string(REPLACE ";" " " CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")

# Load toolchain_cc-family macros
# Clang and GCC are almost feature+flag compatible, so reuse freestanding gcc
include(${ZEPHYR_BASE}/cmake/compiler/gcc/target_security_fortify.cmake)
include(${ZEPHYR_BASE}/cmake/compiler/gcc/target_security_canaries.cmake)
include(${ZEPHYR_BASE}/cmake/compiler/gcc/target_optimizations.cmake)
include(${ZEPHYR_BASE}/cmake/compiler/gcc/target_cpp.cmake)