|  | # Copyright 2019 The Pigweed Authors | 
|  | # | 
|  | # Licensed under the Apache License, Version 2.0 (the "License"); you may not | 
|  | # use this file except in compliance with the License. You may obtain a copy of | 
|  | # the License at | 
|  | # | 
|  | #     https://www.apache.org/licenses/LICENSE-2.0 | 
|  | # | 
|  | # Unless required by applicable law or agreed to in writing, software | 
|  | # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | 
|  | # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | 
|  | # License for the specific language governing permissions and limitations under | 
|  | # the License. | 
|  | """Does nothing. | 
|  |  | 
|  | The purpose of this script is to allow for source file dependencies within GN | 
|  | to be attached to targets that do not typically support them, such as groups. | 
|  |  | 
|  | For example, instead of creating a group target, a pw_python_script target to | 
|  | run this script can be created. The script can be given a list of input files, | 
|  | causing GN to rebuild the target and everything that depends on it whenever any | 
|  | input file is modified. | 
|  |  | 
|  | This is useful in the case where metadata is attached to a group of files but | 
|  | not collected into a generated_file until a later target. | 
|  | """ |