你的项目在其他VS2015环境下是正常的吗？
你是如何创建的这个项目？是VC++ console 项目？
建议重置VS settings，然后创建一个新的项目试试。
>>未知错误 Intellisense PCH文件无法生成.
看看是不是和项目属性设置 C/C++-> Precompiled Headers有关！
参考：
https://social.msdn.microsoft.com/Forums/vstudio/en-US/59c34484-a480-4bed-ad4c-9e2ba2b493d1/pch-header-warning?forum=vcgeneral
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