---
title: GHC Compilation Options
...

Model based on a blog post [Haskell Web Server in a 5MB Docker Image](https://www.fpcomplete.com/blog/2015/05/haskell-web-server-in-5mb). The actual reference for build options is on [GHC Haskell Wiki](https://ghc.haskell.org/trac/ghc/wiki/Building/Using#Buildconfiguration).

When building GHC compiler, one can choose from the following compilation options:

```clafer
CompilationOptions
  with_ghc -> GHC  // the existing version of GHC used for the build
  // should there be a LLVM version of the existing GHC?
  xor buildFlavor
    quick
    perf
    perfLlvm  
      // [ llvm ] // should perfLlvm require choosing GHCBackend.llvm?
  xor INTEGER_LIBRARY
    integer_gmp
    integer_simple
  xor GHCBackend
    asm
    llvm -> LLVM
```

And the available choices for GHC and LLVM:

```clafer
enum GHC =  GHC_784 | GHC_7101
enum LLVM = LLVM_34 | LLVM_35
```

```{.clafer .config}
```