def METHOD_NAME():
    if 'definitions' not in C:
        return ''
    defs = ''
    def_defs = ['*', BZ_OS]
    def_prefix = '-D'
    if BZ_ISWIN:
        def_prefix = '/D'
    for def_def in def_defs:
        if def_def not in C['definitions']:
            continue
        for entry in C['definitions'][def_def]:
            defs += '%s%s ' % (def_prefix, apply_template_vars(entry))
    return defs