详细安装步骤在github上有，https://github.com/Valloric/YouCompleteMe，我这里是自己总结的简化版安装步骤。
步骤1.安装Vundle
首先，clone到本地
git clone https://github.com/VundleVim/Vundle.vim.git ~/.vim/bundle/Vundle.vim- 把以下内容复制到.vimrc:
set nocompatible " be iMproved, required
filetype off " required " set the runtime path to include Vundle and initialize
set rtp+=~/.vim/bundle/Vundle.vim
call vundle#begin()
" alternatively, pass a path where Vundle should install plugins
"call vundle#begin('~/some/path/here') " let Vundle manage Vundle, required
Plugin 'VundleVim/Vundle.vim' " The following are examples of different formats supported.
" Keep Plugin commands between vundle#begin/end.
" plugin on GitHub repo
Plugin 'tpope/vim-fugitive'
" plugin from http://vim-scripts.org/vim/scripts.html
" Plugin 'L9'
" Git plugin not hosted on GitHub
Plugin 'git://git.wincent.com/command-t.git'
" git repos on your local machine (i.e. when working on your own plugin)
"Plugin 'file:///home/gmarik/path/to/plugin'
" The sparkup vim script is in a subdirectory of this repo called vim.
" Pass the path to set the runtimepath properly.
Plugin 'rstacruz/sparkup', {'rtp': 'vim/'}
" Install L9 and avoid a Naming conflict if you've already installed a
" different version somewhere else.
" Plugin 'ascenator/L9', {'name': 'newL9'} " All of your Plugins must be added before the following line
call vundle#end() " required
filetype plugin indent on " required
" To ignore plugin indent changes, instead use:
"filetype plugin on
"
" Brief help
" :PluginList - lists configured plugins
" :PluginInstall - installs plugins; append `!` to update or just :PluginUpdate
" :PluginSearch foo - searches for foo; append `!` to refresh local cache
" :PluginClean - confirms removal of unused plugins; append `!` to auto-approve removal
"
" see :h vundle for more details or wiki for FAQ
" Put your non-Plugin stuff after this line
- Install Plugins: 打开vim执行
:PluginInstall或者直接输入命令sudo vim +PluginInstall +qall
步骤2.安装工具和cmake
sudo apt-get install build-essential cmake
步骤3.安装python-dev,python3-dev
sudo apt-get install python-dev python3-dev
步骤4.安装clang
sudo apt-get install clang
步骤5.编译
cd ~/.vim/bundle/YouCompleteMe./install.py --clang-completer- 如果编译出错执行：
git submodule update --init --recursive
步骤6.复制以下内容到.vimrc中
"----------------------------"
"------ YouCompleteMe -------"
"----------------------------"
let g:ycm_global_ycm_extra_conf = '~/.vim/bundle/YouCompleteMe/cpp/ycm/.ycm_extra_conf.py' " YouCompleteMe
set runtimepath+=~/.vim/bundle/YouCompleteMe
let g:ycm_collect_identifiers_from_tags_files = " 开启 YCM 基于标签引擎
let g:ycm_collect_identifiers_from_comments_and_strings = " 注释与字符串中的内容也用于补全
let g:syntastic_ignore_files=[".*\.py$"]
let g:ycm_seed_identifiers_with_syntax = " 语法关键字补全
let g:ycm_complete_in_comments =
let g:ycm_confirm_extra_conf =
let g:ycm_key_list_select_completion = ['<c-n>', '<Down>'] " 映射按键, 没有这个会拦截掉tab, 导致其他插件的tab不能用.
let g:ycm_key_list_previous_completion = ['<c-p>', '<Up>']
let g:ycm_complete_in_comments = " 在注释输入中也能补全
let g:ycm_complete_in_strings = " 在字符串输入中也能补全
let g:ycm_collect_identifiers_from_comments_and_strings = " 注释和字符串中的文字也会被收入补全
let g:ycm_global_ycm_extra_conf='~/.vim/bundle/YouCompleteMe/third_party/ycmd/cpp/ycm/.ycm_extra_conf.py'
let g:ycm_show_diagnostics_ui = " 禁用语法检查
inoremap <expr> <CR> pumvisible() ? "\<C-y>" : "\<CR>" | " 回车即选中当前项
nnoremap <c-j> :YcmCompleter GoToDefinitionElseDeclaration<CR>| " 跳转到定义处
"let g:ycm_min_num_of_chars_for_completion=2 " 从第2个键入字符就开始罗列匹配项
步骤7.出现的错误
我安装完以后，出现了以下错误：
YouCompleteMe unavailable: requires Vim compiled with Python (2.6+ or 3.3+)