message: tools: force usage of clang-format version 9
  If not available on the system, the suggestion is to use it from docker.
diff: @@ -26,7 +26,17 @@ semver_regex="(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)"
  if [[ $version =~ $semver_regex ]]; then
  version_major=${BASH_REMATCH[1]}
  if [ "$version_required_major" -gt "$version_major" ]; then
  - echo "Clang version $version_major too old (required >= $version_required_major)"
  + echo "Clang version $version_major too old (required: $version_required_major)"
  + echo "You can use clang-format-9 from docker:"
  + echo ""
  + echo " 'tools/run-docker.sh tools/fix_style.sh .'"
  + exit 1
  +
  +elif [ "$version_required_major" -lt "$version_major" ]; then
  + echo "Clang version $version_major too new (required: $version_required_major)"
  + echo "You can use clang-format-9 from docker:"
  + echo ""
  + echo " 'tools/run-docker.sh tools/fix_style.sh .'"
  exit 1
  fi
  