AFAIK，这是Ubuntu包装中的一个众所周知的错误.原始问题仍然存在于Ubuntu 16.04上的llvm-3.8-dev中，请参见此处和此处.

AFAIK, this is a well-known bug in Ubuntu's packaging. The original issue still persists in llvm-3.8-dev on Ubuntu 16.04 see here and here.

在尝试通过手动设置导入前缀来修复LLVMExports.cmake时

When attempting to fix LLVMExports.cmake by manually setting the import prefix

set(_IMPORT_PREFIX "/usr/lib/llvm-3.8")

CMake能够找到libLLVMSupport.a和其他库.但是，我遇到了以下问题

CMake was able to find libLLVMSupport.a and other libraries. However, I was faced with the following issue

 The imported target "PollyISL" references the file

    "/usr/lib/llvm-3.8/lib/libPollyISL.a"

 but this file does not exist.  Possible reasons include:

令人惊讶的是，库libPollyISL.a甚至在LLVM安装目录中都不存在.因此，问题不仅仅在于CMake config.

Surprisingly, library libPollyISL.a does not even exist in LLVM installation directory. Therefore, the problem is more than CMake config.

要节省时间，请从源代码自己构建LLVM并设置LLVM_DIR env变量.请参阅此教程.

To save time, build LLVM yourself from source and set LLVM_DIR env variable. See this tutorial.