function(redefine_file_macro targetname)
    get_target_property(source_files "${targetname}" SOURCES)
    foreach(sourcefile ${source_files})
        get_property(defs SOURCE "${sourcefile}"
            PROPERTY COMPILE_DEFINITIONS)
        get_filename_component(filepath "${sourcefile}" ABSOLUTE)
        string(REPLACE ${PROJECT_SOURCE_DIR}/ "" relpath ${filepath})
        list(APPEND defs "__FILE__=\"${relpath}\"")
        set_property(SOURCE "${sourcefile}" PROPERTY COMPILE_DEFINITIONS ${defs})
    endforeach()
endfunction()