c++ - 将 CMake 与 LLVM 一起使用时出错

Question

所以我正在尝试使用 LLVM 构建一个玩具编译器，并且我想使用 CMake 作为我的构建系统。我尝试使用 sample CMakeLists.txt来自 LLVM 的网站，但在运行 cmake 时遇到以下错误:

CMake Error at /usr/share/llvm-3.8/cmake/LLVMConfig.cmake:178  (include):
  include could not find load file:

    /usr/share/llvm/cmake/LLVMExports.cmake
Call Stack (most recent call first):
  CMakeLists.txt:4 (find_package)


CMake Error at /usr/share/llvm-3.8/cmake/LLVMConfig.cmake:181 (include):
  include could not find load file:

    /usr/share/llvm/cmake/LLVM-Config.cmake
Call Stack (most recent call first):
  CMakeLists.txt:4 (find_package)

当我去排查问题时，我发现我系统上的路径实际上是/usr/share/llvm-3.8/。当我尝试像预期的那样将路径更改为 /usr/share/llvm/ 时，我收到另一个错误:

CMake Error at /usr/share/llvm/cmake/LLVMExports.cmake:1034 (message):
  The imported target "LLVMSupport" references the file

     "/usr/lib/libLLVMSupport.a"

  but this file does not exist.  Possible reasons include:

  * The file was deleted, renamed, or moved to another location.

  * An install or uninstall procedure did not complete successfully.

  * The installation package was faulty and contained

     "/usr/share/llvm/cmake/LLVMExports.cmake"

  but not all the files it references.

我并不是 CMake 究竟是如何工作的专家，所以我不确定从这里该何去何从。我正在运行 Ubuntu 16.04，我尝试通过各种不同的包安装 LLVM，结果相同。这是 Ubuntu 打包系统的问题，还是我可以解决的问题？

Answer 1

据我所知，这是 Ubuntu 打包中的一个众所周知的错误。原始问题在 Ubuntu 16.04 上的 llvm-3.8-dev 中仍然存在，请参阅 here和 here .

尝试通过手动设置导入前缀修复 LLVMExports.cmake 时

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

 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 甚至不存在于 LLVM 安装目录中。因此，问题不仅仅是CMake配置。

为了节省时间，从源代码自己构建 LLVM 并设置 LLVM_DIR 环境变量。看这个tutorial .