将Haskell程序编译为LLVM IR [英] Compile Haskell programs to LLVM IR

问题描述

根据将此SO帖子的Haskell程序编译为C不再(正式)支持.因此，我想探讨将Haskell程序编译为LLVM IR的选项.我选择了与上述帖子相同的程序:

According to this SO post compilation of Haskell programs to C is no longer (officially) supported. So I wanted to explore the option of compiling Haskell programs to LLVM IR. I chose the same program of the mentioned post:

quicksort [] = []
quicksort (p:xs) = (quicksort lesser) ++ [p] ++ (quicksort greater)
  where
    lesser  = filter (<  p) xs
    greater = filter (>= p) xs

main = print(quicksort([5,2,1,0,8,3]))

，然后尝试使用以下命令将其编译为LLVM IR:

and then tried to compile it to LLVM IR with:

$ ghc -fllvm main.hs

然后我收到有关LLVM版本的此错误:

Then I get this error regarding the LLVM version:

<no location info>: error:
    Warning: Couldn't figure out LLVM version!
             Make sure you have installed LLVM 3.7
ghc: could not execute: opt-3.7

当我检查我的opt版本时，它是3.8.0，该版本更大:

When I check my opt version it's 3.8.0, which is bigger:

$ opt --version
LLVM (http://llvm.org/):
  LLVM version 3.8.0
  DEBUG build with assertions.
  Built Jun 20 2018 (14:59:34).
  Default target: x86_64-unknown-linux-gnu
  Host CPU: broadwell

那是怎么回事? ghc是否可以确切预期3.7.0版，仅此而已！！

编辑:

在安装llvm 3.7.0并复制opt和llc以具有3.7后缀后:

After installing llvm 3.7.0 and copying opt and llc to have 3.7 suffixes:

$ cp opt opt-3.7
$ cp llc llc-3.7

使用以下行，

编译到llvm不会出错:

compilation to llvm goes without errors, using this line:

$ ghc -keep-llvm-files main.hs

并创建一个名为main.ll的文件.

and a file called main.ll is created.

推荐答案

是的，GHC需要LLVM的确切版本. LLVM的内部结构变化非常快，因此GHC(就像许多其他针对或使用LLVM的工具一样)采用了非常保守的方法来对这些工具进行版本控制.

Yes, GHC expects an exact version of LLVM. The LLVM internals change very quickly, and so GHC (like many other tools which target or use LLVM) takes a very conservative approach to versioning of those tools.

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