如何使用 GHC/stack 在 macOS 上创建本机 ARM 可执行文件

Question

GHC now ( since 8.10.5 ) supports producing ARM code on macOS.

What flags or options in GHC or Stack do I need to use in order for it to produce ARM executables?

Context: I have an Apple silicon Mac. It can run x86_64 code via Rosetta but it can also run native ARM code.

Answer 1

I will avoid discussing cross-compilation, since I don't think it is necessary.

For versions below GHC 9.2, you need to pass -fllvm in ghc-options . This is because GHC didn't include a Native Code Generator for the M1 yet. The Stack guide has a section on using ghc-options . You can set them globally, or you can set them for a narrower scope. You can try stack repl --resolver lts-19.1 --ghc-options -fllvm in your project to see if its dependencies are compatible with GHC 9.0.2, which is what LTS 19.1 uses.

For versions GHC 9.2+, GHC has a Native Code Generator such that it can compile for the M1 without LLVM. This should just work, with no need to pass any special ghc-options .

Make sure you are using Stack v2.7.5+, because this version added support for installing GHC on macOS aarch64 (which is what the M1 is). See the changelog . You can upgrade Stack using stack upgrade .

Stack v2.7.5 hasn't been tested with versions above GHC 9.0 though, so you may want to use Cabal instead, if you choose to use GHC 9.2+. See this snippet:

$ stack repl --compiler ghc-9.2.2
Stack has not been tested with GHC versions above 9.0, and using 9.2.2, this may fail