old_contents: # Copyright 2017 Renato Utsch
  #
  # 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
  #
  #    http://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.
  
  # Use this in all C++ cc_library and cc_binary rules that are part of compnat.
  COMPNAT_CPP_COPTS = [
      "-Wall",
      "-Wextra",
      "-Werror",
      "-pedantic",
      "-std=c++17",
  ]
  
new_contents: # Copyright 2017 Renato Utsch
  #
  # 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
  #
  #    http://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.
  
  # Use this in all C++ cc_library and cc_binary rules that are part of compnat.
  COMPNAT_CPP_COPTS = [
      "-Wall",
      "-Wextra",
      "-Werror",
      "-pedantic",
      "-std=c++1z",
  ]
  
subject: Downgrade minimum C++ version to c++1z to support older C++17 compilers.