采用ycmd模式 加上 前面介绍的company-mode
首先下载并安装ycmd server
参考，重点内容已经截出来
Building
[Clients commonly build and set up ycmd for you; you are unlikely to need tobuild ycmd yourself unless you want to build a new client.]
This is all for Ubuntu Linux. Details on getting ycmd running on other OS’s can befound in (ignore the Vim-specific parts).
First, install the dependencies:
sudo apt-get install build-essential cmake python-dev
When you first clone the repository you’ll need to update the submodules:
git submodule update –init –recursive
Then run ./build.py –clang-completer –omnisharp-completer –gocode-completer.This should get you going.
For more detailed instructions on building ycmd, see (ignore the Vim-specific parts).
编译好后，会出现一个在ycmd目录下出现一个同名的ycmd目录。这个路径等会需要。
然后用package system安装ycmd和company模块
这个不再细说。
配置init.el文件如下;; company mode(add-hook ‘c++-mode-hook ‘company-mode);; ycmd(require ‘ycmd)(add-hook ‘c++-mode-hook ‘ycmd-mode)(set-variable ‘ycmd-server-command ‘("python" "/home/dean/work/software/ycmd/ycmd"))(set-variable ‘ycmd-extra-conf-whitelist ‘("/home/dean/work/gitlab/gitlab.com/cppwizard/console/*"))(require ‘company-ycmd)(company-ycmd-setup)为C++工程配置专门的ycmd文件
文件可以从ycmd的example目录中复制出来，名为.ycm_extra_conf.py，放在这里
/home/dean/work/gitlab/gitlab.com/cppwizard/console/*
我做了修改，主要是改了include目录，删除了object c的配置flags = [‘-Wall’,’-Wextra’,’-Werror’,’-fexceptions’,’-DNDEBUG’,# THIS IS IMPORTANT! Without a "-std=<something>" flag, clang won’t know which# language to use when compiling headers. So it will guess. Badly. So C++# headers will be compiled as C headers. You don’t want that so ALWAYS specify# a "-std=<something>".# For a C project, you would set this to something like ‘c99’ instead of# ‘c++11′.’-std=c++11′,# …and the same thing goes for the magic -x option which specifies the# language that the files to be compiled are written in. This is mostly# relevant for c++ headers.# For a C project, you would set this to ‘c’ instead of ‘c++’.’-x’,’c++’,’-isystem’,’/usr/include’,’-isystem’,’/usr/local/include’,’-isystem’,’/home/dean/work/gitlab/gitlab.com/cppwizard/console/include’]使用吧，重启emacs, 进入C++代码开始编辑，第一次会说等待服务启动，那就过会儿，再试。会看到很舒服的提示，，不仅标准库能自动提示，自己的代码也行了。
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