maint: build wheels for macos arm64 in Cirrus CI

.cirrus.yml

@@ -0,0 +1,22 @@
+#########################################################
+# Build arm64 wheels for OSX on Cirrus CI
+#########################################################
+
+cirrus_wheels_macos_arm64_task:
+  name: Build macOS arm64 wheels.
+  macos_instance:
+    image: ghcr.io/cirruslabs/macos-monterey-xcode:13.3.1
+  env:
+    PATH: /opt/homebrew/opt/[email protected]/bin:$PATH
+    CIBW_ARCHS_MACOS: arm64
+  install_pre_requirements_script:
+    - brew install [email protected]
+    - ln -s python3 /opt/homebrew/opt/[email protected]/bin/python
+    - which python
+    - python --version
+  install_cibuildwheel_script:
+    - python -m pip install cibuildwheel==2.11.4
+  run_cibuildwheel_script:
+    - bin/cibw.sh
+  wheels_artifacts:
+    path: "wheelhouse/*"

.github/workflows/buildwheel.yml

@@ -40,7 +40,7 @@ jobs:
           CIBW_MANYLINUX_X86_64_IMAGE: manylinux2014
           CIBW_MANYLINUX_I686_IMAGE: manylinux2014
           CIBW_BEFORE_ALL_LINUX: bin/cibw_before_all_linux.sh
-          CIBW_BEFORE_ALL_MACOS: bin/cibw_before_all_macosx.sh
+          CIBW_BEFORE_ALL_MACOS: bin/cibw_before_all_macosx_x86_64.sh
           CIBW_BEFORE_ALL_WINDOWS: msys2 -c bin/cibw_before_all_windows.sh
           CIBW_BEFORE_BUILD_WINDOWS: msys2 -c bin/cibw_before_build_windows.sh
           CIBW_BEFORE_BUILD: pip install numpy cython delvewheel

bin/build_dependencies_unix.sh

@@ -9,12 +9,15 @@ set -o errexit
 #                                                                           #
 # Supported options:                                                        #
 #                                                                           #
-# --gmp gmp   - build based on GMP (default)                                #
-# --gmp mpir  - build based on MPIR (instead of GMP)                        #
+# --gmp gmp         - build based on GMP (default)                          #
+# --gmp mpir        - build based on MPIR (no longer works)                 #
+# --host <HOST>     - set the host (target) for GMP build                   #
+# --patch-gmp-arm64 - apply patch to GMP for OSX arm64                      #
 #                                                                           #
 # ------------------------------------------------------------------------- #
 
 USE_GMP=gmp
+PATCH_GMP_ARM64=no
 
 while [[ $# -gt 0 ]]
 do
@@ -41,6 +44,14 @@ do
       shift
       shift
     ;;
+    --patch-gmp-arm64)
+      PATCH_GMP_ARM64=yes
+      shift
+    ;;
+  *)
+    2>&1 echo "unrecognised argument:" $key
+    exit 1
+    ;;
   esac
 done
 
@@ -74,6 +85,23 @@ if [ $USE_GMP = "gmp" ]; then
   curl -O https://gmplib.org/download/gmp/gmp-$GMPVER.tar.xz
   tar xf gmp-$GMPVER.tar.xz
   cd gmp-$GMPVER
+
+    #
+    # See https://github.com/aleaxit/gmpy/issues/350
+    #
+    # We need to patch GMP for OSX arm64 (Apple M1) hardware. This patch is
+    # from the GMP repo but was applied after the release of GMP 6.2.1.
+    # Hopefully when a newer version of GMP is released we will not need to
+    # apply this patch any more.
+    #
+    if [ $PATCH_GMP_ARM64 = "yes" ]; then
+      echo
+      echo --------------------------------------------
+      echo "           patching GMP"
+      echo --------------------------------------------
+      patch -N -Z -p0 < ../../../bin/patch-arm64.diff
+    fi
+
     # Show the output of configfsf.guess
     ./configfsf.guess
     ./configure --prefix=$PREFIX\
@@ -109,6 +137,18 @@ else
   #                                                                         #
   # ----------------------------------------------------------------------- #
 
+  #
+  # The mpir.org domain has expired and no longer hosts the source code so the
+  # call to curl below will fail.
+  # We could try to download from https://github.com/wbhart/mpir/releases.
+  #
+  # Ultimately it seems that MPIR is no longer maintained though so for now
+  # this remains unfixed.
+  #
+
+  >&2 echo "MPIR build of python_flint is no longer supported"
+  exit 1
+
   curl -O http://mpir.org/mpir-$MPIRVER.tar.bz2
   tar xf mpir-$MPIRVER.tar.bz2
   cd mpir-$MPIRVER

bin/cibw.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+#
+# This script can be used to test cibuildwheel locally on OSX/Linux
+#
+# It is also worth commenting out the BEFORE_ALL line to build GMP etc after you have
+# built those once because that is by far the slowest step.
+#
+
+rm -f wheelhouse/*
+
+# bin/build_dependencies_unix.sh places headers and shared libraries under .local
+export CIBW_ENVIRONMENT='C_INCLUDE_PATH=$(pwd)/.local/include/ LIBRARY_PATH=$(pwd)/.local/lib/ LD_LIBRARY_PATH=$(pwd)/.local/lib:$LD_LIBRARY_PATH PYTHON_FLINT_MINGW64=true'
+
+export CIBW_BUILD='cp39-* cp310-* cp311-*'
+# export CIBW_BUILD='cp311-*'
+export CIBW_SKIP='*-win32 *-manylinux_i686 *-musllinux_*'
+
+# export CIBW_ARCHS_MACOS="x86_64"
+export CIBW_ARCHS_MACOS="arm64"
+
+export CIBW_BEFORE_ALL_LINUX=bin/cibw_before_all_linux.sh
+# export CIBW_BEFORE_ALL_MACOS=bin/cibw_before_all_macosx_x86_64.sh
+export CIBW_BEFORE_ALL_MACOS=bin/cibw_before_all_macosx_arm64.sh
+export CIBW_BEFORE_ALL_WINDOWS='C:\\msys64\\usr\\bin\\bash bin/cibw_before_all_windows.sh'
+
+export CIBW_BEFORE_BUILD='pip install numpy cython delvewheel'
+export CIBW_BEFORE_BUILD_WINDOWS='C:\\msys64\\usr\\bin\\bash bin/cibw_before_build_windows.sh'
+
+export CIBW_REPAIR_WHEEL_COMMAND_WINDOWS='bin\cibw_repair_wheel_command_windows.bat {dest_dir} {wheel}'
+
+# export CIBW_TEST_COMMAND="python -c 'import flint; print(str(flint.fmpz(2)))'"
+export CIBW_TEST_COMMAND="python {project}/test/test.py && python {project}/test/dtest.py"
+
+# cibuildwheel --platform linux
+# cibuildwheel --platform windows
+cibuildwheel --platform macos

bin/cibw_before_all_macosx_arm64.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+export CPPFLAGS=" --target=arm64-apple-macos11"
+export LDFLAGS=" -arch arm64"
+
+bin/build_dependencies_unix.sh\
+  --gmp gmp\
+  --host aarch64-apple-darwin\
+  --patch-gmp-arm64