File: DefineRelativeFilePaths.cmake

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# Source: https://stackoverflow.com/questions/237542/getting-base-name-of-the-source-file-at-compile-time

function (cmake_define_relative_file_paths SOURCES)
  foreach (SOURCE IN LISTS SOURCES)
    file (
      RELATIVE_PATH RELATIVE_SOURCE_PATH
      ${PROJECT_SOURCE_DIR} ${SOURCE}
    )

    set_source_files_properties (
      ${SOURCE} PROPERTIES
      COMPILE_DEFINITIONS FILENAME="${RELATIVE_SOURCE_PATH}"
    )
  endforeach ()
endfunction ()