how can I use --dry-run option in clang-format? - clang

Question

my os is ubuntu 16.04 and I want to use --dry-run option included in clang-format.
but when I write clang-format --help on terminal, it doesn't have --dry-run option.
as I guess it's because of version. when I write sudo apt-get install clang-format I shows me installing clang-format-3.8.
so I wonder
the reason that clang-format does not have --dry-run option is due to version?
2-1. if first question is yes, Is there any way that I can install clang-format version over 10?
2-2. if first question is no, how can I use --dry-run option?

Answer 1

the reason that clang-format does not have --dry-run option is due to version?
Yes, --dry-run was added in Nov
2019
when Clang 10.0.0 came out.
if first question is yes, Is there any way that I can install
clang-format version over 10
You could either upgrade your Ubuntu installation as clang-format 10
is available in newer
systems
or build it manually but the easiest and most preferred way these days
is to run official Ubuntu docker
image:
$ docker run -it ubuntu
root#502d5d8cfb26:/# head -n2 /etc/os-release
NAME="Ubuntu"
VERSION="20.04.1 LTS (Focal Fossa)"
root#502d5d8cfb26:/# apt-get update
root#502d5d8cfb26:/# apt-get -y install clang-format
root#502d5d8cfb26:/# clang-format --version
clang-format version 10.0.0-4ubuntu1
root#502d5d8cfb26:/# clang-format --help | grep -- '--dry-run'
--dry-run - If set, do not actually make the formatting changes
--ferror-limit=<uint> - Set the maximum number of clang-format errors to emit before stopping (0 = no limit). Used only with --dry-run or -n
-n - Alias for --dry-run