cmake/linker/ld/target.cmake

# SPDX-License-Identifier: Apache-2.0

find_program(CMAKE_LINKER     ${CROSS_COMPILE}ld      PATH ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)

set_ifndef(LINKERFLAGPREFIX -Wl)


# Run $LINKER_SCRIPT file through the C preprocessor, producing ${linker_script_gen}
# NOTE: ${linker_script_gen} will be produced at build-time; not at configure-time
macro(configure_linker_script linker_script_gen linker_pass_define)
  set(extra_dependencies ${ARGN})

  # Different generators deal with depfiles differently.
  if(CMAKE_GENERATOR STREQUAL "Unix Makefiles")
    # Note that the IMPLICIT_DEPENDS option is currently supported only
    # for Makefile generators and will be ignored by other generators.
    set(linker_script_dep IMPLICIT_DEPENDS C ${LINKER_SCRIPT})
  elseif(CMAKE_GENERATOR STREQUAL "Ninja")
    # Using DEPFILE with other generators than Ninja is an error.
    set(linker_script_dep DEPFILE ${PROJECT_BINARY_DIR}/${linker_script_gen}.dep)
  else()
    # TODO: How would the linker script dependencies work for non-linker
    # script generators.
    message(STATUS "Warning; this generator is not well supported. The
  Linker script may not be regenerated when it should.")
    set(linker_script_dep "")
  endif()

  zephyr_get_include_directories_for_lang(C current_includes)
  get_filename_component(base_name ${CMAKE_CURRENT_BINARY_DIR} NAME)
  get_property(current_defines GLOBAL PROPERTY PROPERTY_LINKER_SCRIPT_DEFINES)

  add_custom_command(
    OUTPUT ${linker_script_gen}
    DEPENDS
    ${LINKER_SCRIPT}
    ${extra_dependencies}
    # NB: 'linker_script_dep' will use a keyword that ends 'DEPENDS'
    ${linker_script_dep}
    COMMAND ${CMAKE_C_COMPILER}
    -x assembler-with-cpp
    ${NOSYSDEF_CFLAG}
    -MD -MF ${linker_script_gen}.dep -MT ${base_name}/${linker_script_gen}
    ${current_includes}
    ${current_defines}
    ${linker_pass_define}
    -E ${LINKER_SCRIPT}
    -P # Prevent generation of debug `#line' directives.
    -o ${linker_script_gen}
    VERBATIM
    WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
  )
endmacro()


# Load toolchain_ld-family macros
include(${ZEPHYR_BASE}/cmake/linker/${LINKER}/target_base.cmake)
include(${ZEPHYR_BASE}/cmake/linker/${LINKER}/target_baremetal.cmake)
include(${ZEPHYR_BASE}/cmake/linker/${LINKER}/target_cpp.cmake)