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 YCM‘s instructions (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 YCM‘sinstructions (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 ‘global-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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