3.8.2/share/cmake-3.8/Modules/MacroAddFileDependencies.cmake

# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.

#.rst:
# MacroAddFileDependencies
# ------------------------
#
# MACRO_ADD_FILE_DEPENDENCIES(<_file> depend_files...)
#
# Using the macro MACRO_ADD_FILE_DEPENDENCIES() is discouraged.  There
# are usually better ways to specify the correct dependencies.
#
# MACRO_ADD_FILE_DEPENDENCIES(<_file> depend_files...) is just a
# convenience wrapper around the OBJECT_DEPENDS source file property.
# You can just use set_property(SOURCE <file> APPEND PROPERTY
# OBJECT_DEPENDS depend_files) instead.

macro (MACRO_ADD_FILE_DEPENDENCIES _file)

   get_source_file_property(_deps ${_file} OBJECT_DEPENDS)
   if (_deps)
      set(_deps ${_deps} ${ARGN})
   else ()
      set(_deps ${ARGN})
   endif ()

   set_source_files_properties(${_file} PROPERTIES OBJECT_DEPENDS "${_deps}")

endmacro ()