Tim Humphries thumphries

Notes on cross-compiling GHC for a Darwin target.

TL;DR I managed to get most of a stage1 to build. I got a linker failure during ghc-prim, but most of the libraries had already built successfully, including some C FFI-heavy packages like bytestring. I suspect my toolchain was just in the wrong spot, and/or libraries misconfigured.

We need a normal host GCC toolchain (build-essential), autoconf, happy, alex, and a platform copy of GHC (the Stage0).
As per the GHC CrossCompiling page on Trac, we need a GCC crosschain. I used osxcross.

Mafia Quick Start

Mafia is a wrapper for cabal-install that eliminates most of the pain points, without the need for a blessed set of packages.

Install, use, upgrade

Put the wrapper script somewhere on your path:

cd $HOME/bin &amp;&amp; wget https://raw.githubusercontent.com/ambiata/mafia/master/script/mafia

	{-# LANGUAGE TemplateHaskell #-}
	module Lens where

	import Control.Lens
	import Data.Monoid (First, (<>))

	data FooBar =
	Foo (Either Int Bool)
	\| Bar (Maybe Bool)


	import Data.ByteString (ByteString)
	import qualified Data.ByteString.Char8 as B8

	import Criterion.Main
	import Criterion.Types (Config (..))

	import qualified Mystery

	{-# LANGUAGE OverloadedStrings #-}
	{-# LANGUAGE PatternSynonyms #-}

	import Control.Applicative
	import Control.Lens
	import Control.Monad

	import Data.ByteString (ByteString)
	import qualified Data.ByteString.Lazy as BSL
	import qualified Data.IORef as IORef

	FROM alpine:latest

	COPY build.mk /tmp/

	RUN apk add --update curl xz alpine-sdk perl gmp-dev file gmp openssh openssl zlib-dev strace vim less jq ncurses-dev bash autoconf

	RUN cd /tmp && \
	wget http://ghc-musl-dist-apse2.s3-website-ap-southeast-2.amazonaws.com/ghc-7.8.4/ghc-7.8.4-x86_64-unknown-linux.tar.bz2 && \
	tar xvf ghc*.tar.bz2 && \
	cd ghc-7.8.4 && \

	name = "Client"
	kernel = "Client"
	memory = 16
	seclabel ='system_u:system_r:domU_t'

	{-# LANGUAGE OverloadedStrings #-}

	import Data.QRCode
	import Data.Text (Text, pack, unpack)
	import qualified Data.Text as T
	import qualified Data.Text.IO as T
	import Data.Word8
	import System.Environment
	import System.IO

	build/
	node_modules/