LookingGlass/cmake/MakeObject.cmake

function(make_object out_var)
  set(result)
  set(result_h)
  foreach(in_f ${ARGN})
    file(RELATIVE_PATH out_f ${CMAKE_CURRENT_SOURCE_DIR} "${CMAKE_CURRENT_SOURCE_DIR}/${in_f}")
    set(out_h "${CMAKE_CURRENT_BINARY_DIR}/${out_f}.h")
    set(out_f "${out_f}.o")
    string(REGEX REPLACE "[/.-]" "_" sym_in "${in_f}")

    add_custom_command(OUTPUT ${out_f}
      COMMAND cp ${CMAKE_CURRENT_SOURCE_DIR}/${in_f} ${out_f}.tmp
      COMMAND dd if=/dev/zero bs=1 count=1 of=${out_f}.tmp oflag=append conv=notrunc status=none
      COMMAND ${CMAKE_LINKER} -r -b binary -o ${out_f} ${out_f}.tmp
      COMMAND ${CMAKE_OBJCOPY} --rename-section .data=.rodata,CONTENTS,ALLOC,LOAD,READONLY,DATA ${out_f} ${out_f}
      COMMAND ${CMAKE_OBJCOPY} --redefine-sym _binary_${sym_in}_o_tmp_start=b_${sym_in} ${out_f} ${out_f}
      COMMAND ${CMAKE_OBJCOPY} --redefine-sym _binary_${sym_in}_o_tmp_end=b_${sym_in}_end ${out_f} ${out_f}
      COMMAND ${CMAKE_OBJCOPY} --redefine-sym _binary_${sym_in}_o_tmp_size=b_${sym_in}_size ${out_f} ${out_f}
      COMMAND ${CMAKE_OBJCOPY} --strip-symbol _binary_${sym_in}_size ${out_f} ${out_f}
      DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/${in_f}"
      WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
      COMMENT "Creating object from ${in_f}"
      VERBATIM
    )

    file(WRITE  ${out_h} "extern const char b_${sym_in}[];\n")
    file(APPEND ${out_h} "extern const char b_${sym_in}_end[];\n")
    file(APPEND ${out_h} "#define b_${sym_in}_size (b_${sym_in}_end - b_${sym_in})\n")

    get_filename_component(h_dir ${out_h} DIRECTORY)
    list(APPEND result_h ${h_dir})
    list(APPEND result ${out_f})
  endforeach()
  list(REMOVE_DUPLICATES result_h)

  set(${out_var}_OBJS "${result}"   PARENT_SCOPE)
  set(${out_var}_INCS "${result_h}" PARENT_SCOPE)
endfunction()

function(make_defines in_file out_file)
  file(RELATIVE_PATH rel_f ${CMAKE_CURRENT_SOURCE_DIR} "${in_file}")
  add_custom_command(OUTPUT ${out_file}
    COMMAND grep "^#define" "${in_file}" > "${out_file}"
    DEPENDS ${in_file}
    COMMENT "Creating #defines from ${rel_f}"
  )
endfunction()