YouCompleteMe/third_party/ycmd/third_party/cregex" does not appear to contain CMakeLists.txt.

• rm -rf YouCompleteMe/third_party/ycmd/third_party/cregex
• git submodule update --init --recursive  at the dir of "YouCompleteMe/third_party/ycmd/third_party"

完美解决！

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'

Plugin 'scrooloose/nerdtree'

Plugin 'jistr/vim-nerdtree-tabs'

Plugin 'Xuyuanp/nerdtree-git-plugin'

Plugin 'majutsushi/tagbar'

Plugin 'scrooloose/syntastic'

Plugin 'vim-airline/vim-airline'

Plugin 'vim-airline/vim-airline-themes'

Plugin 'jiangmiao/auto-pairs'

Plugin 'Valloric/YouCompleteMe'

Plugin 'tpope/vim-fugitive'

Plugin 'rstacruz/sparkup', {'rtp': '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/'}

" Pass the path to set the runtimepath properly.

" Plugin 'rstacruz/sparkup', {'rtp': 'vim/'}

" Avoid a name conflict with L9

" Plugin 'user/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

" airline

"设置打开vim的时候默认打开目录树"

let g:nerdtree_tabs_open_on_console_startup=

" 关闭NERDTree快捷键

map <C-t> :NERDTreeToggle<CR>

""当NERDTree为剩下的唯一窗口时自动关闭

autocmd bufenter * if (winnr("$") ==  && exists("b:NERDTree") && b:NERDTree.isTabTree()) | q | endif

let g:NERDTreeDirArrowExpandable = '►'

let g:NERDTreeDirArrowCollapsible = '▼'

let NERDTreeAutoCenter=

" 是否显示隐藏文件

let NERDTreeShowHidden=

" 设置宽度

let NERDTreeWinSize=

"let g:NERDTreeIndicatorMapCustom = {

"    \ "Modified"  : "✹",

"    \ "Staged"    : "✚",

"    \ "Untracked" : "✭",

"    \ "Renamed"   : "➜",

"    \ "Unmerged"  : "═",

"    \ "Deleted"   : "✖",

"    \ "Dirty"     : "✗",

"    \ "Clean"     : "✔︎",

"    \ "Ignored"   : "☒'",

"    \ "Unknown"   : "?"

"    \ }

"""""""""""""""""""""""""""""""""""""""

let g:airline_powerline_fonts =

set t_Co=

set laststatus=

" ycm

"let g:ycm_python_binary_path='/usr/bin/python'

let g:ycm_confirm_extra_conf=

"let g:ycm_server_python_interpreter='/usr/bin/python'

"let g:ycm_global_ycm_extra_conf='~/.vim/.ycm_extra_conf.py'

let g:ycm_global_ycm_extra_conf='~/.vim/bundle/YouCompleteMe/third_party/ycmd/.ycm_extra_conf.py'

let g:ycm_confirm_extra_conf=

"let g:clang_use_library=1

set completeopt-=preview

" 不显示开启vim时检查ycm_extra_conf文件的信息

let g:ycm_confirm_extra_conf=

" 开启基于tag的补全，可以在这之后添加需要的标签路径

let g:ycm_collect_identifiers_from_tags_files=

"注释和字符串中的文字也会被收入补全

let g:ycm_collect_identifiers_from_comments_and_strings =

"" 输入第2个字符开始补全

let g:ycm_min_num_of_chars_for_completion=

" 禁止缓存匹配项,每次都重新生成匹配项

let g:ycm_cache_omnifunc=

" " 开启语义补全

let g:ycm_seed_identifiers_with_syntax=

" "在注释输入中也能补全

let g:ycm_complete_in_comments =

" "在字符串输入中也能补全

let g:ycm_complete_in_strings =

" " 设置在下面几种格式的文件上屏蔽ycm

let g:ycm_filetype_blacklist = {

      \ 'tagbar' : ,

      \ 'nerdtree' : ,

      \}

let g:ycm_key_list_select_completion = ['<Down>']

let g:ycm_key_list_previous_completion = ['<Up>']

" 修改对C函数的补全快捷键，默认是CTRL + space，修改为ALT + ;

let g:ycm_key_invoke_completion = '<M-;>'

"let g:ycm_add_preview_to_completeopt = 0

""let g:ycm_show_diagnostics_ui =

let g:ycm_server_log_level = 'info'

let g:ycm_min_num_identifier_candidate_chars =

let g:ycm_collect_identifiers_from_comments_and_strings =

let g:ycm_key_invoke_completion = '<c-z>'

"set completeopt=menu,menuone

noremap <c-z> <NOP>

let g:ycm_semantic_triggers =  {

                        \ 'c,cpp,python,java,go,erlang,perl': ['re!\w{2}'],

                        \ 'cs,lua,javascript': ['re!\w{2}'],

                        \ }

synta on

set number

set cindent

set autoindent

set expandtab

set smarttab

" set mouse=a

set shiftwidth=

set softtabstop=

set hls

set bg=dark

注意：补全c++头文件，或者c的头文件，需要在 .ycm_extra_conf.py 文件里修改 flags

flags = [

] 里面加上，下面

'-isystem',

'/usr/include',

'-isystem',

'/usr/include/c++/5.4.0',