commit https://github.com/vim/vim/commit/827b165b2aebad2cfe98cc6d5804c6c0fe8afd89 Author: Bram Moolenaar <Bram@vim.org> Date: Thu May 5 18:14:03 2016 +0200 patch 7.4.1819 Problem: Compiler warnings when sprintf() is a macro. Solution: Don't interrupt sprintf() with an #ifdef. (Michael Jarvis, closes https://github.com/vim/vim/issues/788)

" Vim filetype plugin
" Language:	Dockerfile
" Maintainer:   Honza Pokorny <http://honza.ca>
" Last Change:	2014 Aug 29

" Only do this when not done yet for this buffer
if exists("b:did_ftplugin")
  finish
endif

" Don't load another plugin for this buffer
let b:did_ftplugin = 1

let b:undo_ftplugin = "setl commentstring<"

setlocal commentstring=#\ %s