libc/startup/gpu/CMakeLists.txt

function(add_startup_object name)
  cmake_parse_arguments(
    "ADD_STARTUP_OBJECT"
    "ALIAS" # Option argument
    "SRC" # Single value arguments
    "DEPENDS;COMPILE_OPTIONS" # Multi value arguments
    ${ARGN}
  )

  get_fq_target_name(${name} fq_target_name)
  if(ADD_STARTUP_OBJECT_ALIAS)
    get_fq_deps_list(fq_dep_list ${ADD_STARTUP_OBJECT_DEPENDS})
    add_library(${fq_target_name} ALIAS ${fq_dep_list})
    return()
  endif()

  add_object_library(
    ${name}
    SRCS ${ADD_STARTUP_OBJECT_SRC}
    COMPILE_OPTIONS ${ADD_STARTUP_OBJECT_COMPILE_OPTIONS}
      ${ADD_STARTUP_OBJECT_UNPARSED_ARGUMENTS}
    DEPENDS ${ADD_STARTUP_OBJECT_DEPENDS}
  )
  set_target_properties(
    ${fq_target_name}
    PROPERTIES
      OUTPUT_NAME ${name}.o
  )

  # Make a relocatable bitcode object for clang if needed.
  if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR)
    llvm_link_bitcode(${fq_target_name}.exe
      OUTPUT ${LIBC_LIBRARY_DIR}/${name}.o
      INPUTS $<TARGET_OBJECTS:${fq_target_name}>
      DEPENDS ${fq_target_name}
    )
  endif()
endfunction()

add_startup_object(
  crt1
  SRC
    start.cpp
  DEPENDS
    libc.config.app_h
    libc.src.__support.RPC.rpc_client
    libc.src.__support.GPU.utils
    libc.src.stdlib.exit
    libc.src.stdlib.atexit
  COMPILE_OPTIONS
    -ffreestanding # To avoid compiler warnings about calling the main function.
    -fno-builtin
)

add_custom_target(libc-startup)
set(startup_components crt1)
foreach(target IN LISTS startup_components)
  set(fq_target_name libc.startup.gpu.${target})
  add_dependencies(libc-startup ${fq_target_name})
  install(FILES $<TARGET_OBJECTS:${fq_target_name}>
    DESTINATION ${LIBC_INSTALL_LIBRARY_DIR}
    RENAME $<TARGET_PROPERTY:${fq_target_name},OUTPUT_NAME>
    COMPONENT libc)
endforeach()