Cross-compilation for MacOS 12 arm64.

.github/workflows/build-test-publish.yml

@@ -40,9 +40,9 @@ jobs:
           - os: macos-11
             arch: x86_64
             fflags: -march=x86-64 -mavx
-#          - os: macos-11
-#            arch: arm64
-#            fflags: -march=armv8.5-a
+          - os: macos-12
+            arch: arm64
+            fflags: -march=armv8.5-a
         python:
           - version: "3.8"
             cp: cp38
@@ -79,11 +79,12 @@ jobs:
         run: gfortran --version
 
       - name: Build wheels
+        if: ${{ matrix.platform.arch != 'arm64' }}
         uses: pypa/[email protected]
         env:
           CIBW_BUILD: ${{ matrix.python.cp }}-*
           CIBW_BUILD_VERBOSITY: 3
-          CIBW_ENVIRONMENT: NPY_DISTUTILS_APPEND_FLAGS=1 FFLAGS='${{ matrix.platform.fflags }}'
+          CIBW_ENVIRONMENT: FFLAGS='${{ matrix.platform.fflags }}'
           CIBW_SKIP: "*-musllinux_*"
           CIBW_ARCHS: ${{ matrix.platform.arch }}
           CIBW_BEFORE_TEST_LINUX: |
@@ -94,6 +95,62 @@ jobs:
           CIBW_TEST_COMMAND: pytest {package}/tests
           PYTHONFAULTHANDLER: "1"
 
+      - name: Build macosx_arm64
+        # This is solely used to build macosx_arm64. As soon as Github Actions make
+        # MacOS arm64 runners available, it should be removed. Adapted from scipy's CI.
+        if: ${{ matrix.platform.os == 'macos-12' && matrix.platform.arch == 'arm64' }}
+        run: |
+          set -ex
+          # Update license
+          cat tools/wheels/LICENSE_osx.txt >> LICENSE.txt
+
+          export PLAT="arm64"
+          export _PYTHON_HOST_PLATFORM="macosx-12.0-arm64"
+          export CROSS_COMPILE=1
+          # Need macOS >= 11 for arm compilation.
+          export MACOSX_DEPLOYMENT_TARGET=11.0
+
+          # SDK root needs to be set early, installation of gfortran/openblas
+          # needs to go in the correct location.
+          export SDKROOT=/Applications/Xcode_13.2.1.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.1.sdk
+          export ARCHFLAGS=" -arch arm64 "
+
+          source tools/wheels/gfortran_utils.sh
+          export MACOSX_DEPLOYMENT_TARGET=11.0
+
+          # The install script requires the PLAT variable in order to set
+          # the FC variable
+          export PLAT=arm64
+          install_arm64_cross_gfortran
+          export FC=$FC_ARM64
+          export PATH=$FC_LOC:$PATH
+
+          export FFLAGS=" -arch arm64 $FFLAGS"
+          export LDFLAGS=" $FC_ARM64_LDFLAGS $LDFLAGS -L/opt/arm64-builds/lib -arch arm64"
+          sudo ln -s $FC $FC_LOC/gfortran
+          echo $(type -p gfortran)
+
+          # having a test fortran program has helped in debugging problems with the
+          # compiler environment.
+          $FC $FFLAGS tools/wheels/test.f $LDFLAGS
+          ls -al *.out
+          otool -L a.out
+
+          export PKG_CONFIG_PATH=/opt/arm64-builds/lib/pkgconfig
+          export PKG_CONFIG=/usr/local/bin/pkg-config
+          export CFLAGS=" -arch arm64 $CFLAGS"
+          export CXXFLAGS=" -arch arm64 $CXXFLAGS"
+          export LD_LIBRARY_PATH="/opt/arm64-builds/lib:$FC_LIBDIR:$LD_LIBRARY_PATH"
+
+          # install dependencies for the build machine
+          pipx run build --wheel
+
+          # Enables delocate to find the libopenblas/libgfortran libraries.
+          export DYLD_LIBRARY_PATH=/opt/gfortran-darwin-arm64/lib/gcc/arm64-apple-darwin20.0.0/10.2.1:/opt/arm64-builds/lib
+          pip3 install delocate
+          delocate-listdeps dist/pysimulators*.whl
+          delocate-wheel --require-archs=arm64 -k -w wheelhouse dist/pysimulators*.whl
+
       - uses: actions/upload-artifact@v3
         with:
           path: ./wheelhouse/*.whl

pyproject.toml

@@ -2,7 +2,7 @@
 build-backend = "setuptools.build_meta"
 requires = [
     "oldest-supported-numpy",
-    "pchanial-legacy-install-hooks>=1.3",
+    "pchanial-legacy-install-hooks>=1.5",
     "setuptools==64.0.3",
     "setuptools_scm[toml]>=6.2",
     "wheel",