Initial version of an ARM64 macOS build

.github/workflows/build.yml

@@ -47,7 +47,7 @@ jobs:
     needs: package_source
     strategy:
       matrix:
-        build: [linux.x86_64, linux.aarch64, linux.armv6hf, darwin.x86_64, windows.x86_64]
+        build: [linux.x86_64, linux.aarch64, linux.armv6hf, darwin.x86_64, darwin.aarch64, windows.x86_64]
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository

build/darwin.aarch64/Dockerfile

@@ -0,0 +1,40 @@
+FROM ghcr.io/shepherdjerred/macos-cross-compiler:latest
+
+ENV TARGET aarch64-apple-darwin22
+ENV TARGETNAME darwin.aarch64
+
+# Build dependencies
+USER root
+ENV DEBIAN_FRONTEND noninteractive
+ENV LC_ALL C.utf8
+
+# Install basic deps
+RUN apt-get update && apt-get install -y automake autoconf build-essential curl xz-utils qemu-user-static
+
+# Install a more suitable host compiler
+WORKDIR /host-ghc
+RUN curl -L "https://downloads.haskell.org/~cabal/cabal-install-3.9.0.0/cabal-install-3.9-x86_64-linux-alpine.tar.xz" | tar xJv -C /usr/local/bin
+RUN curl -L 'https://downloads.haskell.org/~ghc/8.10.7/ghc-8.10.7-x86_64-deb10-linux.tar.xz' | tar xJ --strip-components=1
+RUN ./configure && make install
+
+# Build GHC. We have to use an old version because cross-compilation across OS has since broken.
+WORKDIR /ghc
+RUN curl -L "https://downloads.haskell.org/~ghc/8.10.7/ghc-8.10.7-src.tar.xz" | tar xJ --strip-components=1
+RUN apt-get install -y llvm-12
+RUN ./boot && ./configure --host x86_64-linux-gnu --build x86_64-linux-gnu --target "$TARGET"
+RUN cp mk/flavours/quick-cross.mk mk/build.mk && make -j "$(nproc)"
+RUN make install
+
+# Due to an apparent cabal bug, we specify our options directly to cabal
+# It won't reuse caches if ghc-options are specified in ~/.cabal/config
+ENV CABALOPTS "--ghc-options;-optc-Os -optc-fPIC;--with-ghc=$TARGET-ghc;--with-hc-pkg=$TARGET-ghc-pkg;--constraint=hashable==1.3.5.0"
+
+# Prebuild the dependencies
+RUN cabal update
+RUN IFS=';' && cabal install --dependencies-only $CABALOPTS ShellCheck
+
+# Copy the build script
+COPY build /usr/bin
+
+WORKDIR /scratch
+ENTRYPOINT ["/usr/bin/build"]

build/darwin.aarch64/build

@@ -0,0 +1,15 @@
+#!/bin/sh
+set -xe
+{
+  tar xzv --strip-components=1
+  chmod +x striptests && ./striptests
+  mkdir "$TARGETNAME"
+  cabal update
+  ( IFS=';'; cabal build $CABALOPTS )
+  find . -name shellcheck -type f -exec mv {} "$TARGETNAME/" \;
+  ls -l "$TARGETNAME"
+  "$TARGET-strip" "$TARGETNAME/shellcheck"
+  ls -l "$TARGETNAME"
+  file "$TARGETNAME/shellcheck" | grep "Mach-O 64-bit arm64 executable"
+} >&2
+tar czv "$TARGETNAME"

build/darwin.aarch64/tag

@@ -0,0 +1 @@
+koalaman/scbuilder-darwin-aarch64