先查找系统的头文件路径

[chunli@CentOS ~]$ sudo find / -iname ‘iostream‘ 
/usr/include/c++/4.4.4/iostream
/usr/local/include/c++/6.3.0/iostream

[chunli@CentOS ~]$ sudo find / -iname ‘fstream‘ 
/usr/include/c++/4.4.4/fstream
/usr/local/include/c++/6.3.0/fstream
[chunli@CentOS ~]$

[chunli@CentOS ~]$ sudo find /usr/ -iname  ‘*python.h‘
/usr/share/doc/python-matplotlib-0.99.1.2/CXX/WrapPython.h
/usr/include/python2.6/Python.h

配置前

在flags中添加系统头文件路径

在flags中添加第三方/自定义头文件路径

vim   ~/.vim/.ycm_extra_conf.py 
添加内容
flags = [

‘-isystem‘,
‘/usr/local/include/c++/6.3.0/‘, 

‘-isystem‘,
‘/usr/include/python2.6/‘,       
]

配置后

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Linux平台 YouCompleteMe自动补全C++头文件