add gh action to build python wheels for macos arm64

.github/workflows/python_wheel_macos_arm64.yml

@@ -0,0 +1,54 @@
+name: Python Wheel Build MacOS Arm64
+
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - v*
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  MacOS:
+    runs-on: macos-13
+    env:
+      MACOSX_DEPLOYMENT_TARGET: 11.0
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Install libomp and fftw
+      run: |
+        pkg=$(brew fetch --force --bottle-tag=arm64_ventura fftw | grep 'Downloaded to' | cut -d' ' -f3)
+        brew install $pkg
+        pkg=$(brew fetch --force --bottle-tag=arm64_ventura libomp | grep 'Downloaded to' | cut -d' ' -f3)
+        brew install $pkg
+
+    - name: Compile libfinufft
+      run: |
+        cp make.inc.gh_macos_arm64_whl make.inc
+        make lib
+
+    - name: Build wheels
+      uses: pypa/[email protected]
+      env:
+        FINUFFT_DIR: ${{ github.workspace }}
+        CC: Clang
+        CXX: Clang++
+        CIBW_ARCHS_MACOS: arm64
+        CIBW_BUILD: cp38-* cp39-* cp310-* cp311-* cp312-*
+      with:
+        package-dir: ./python/finufft
+        output-dir: wheelhouse
+
+    - name: Upload wheels
+      uses: actions/upload-artifact@v3
+      with:
+        name: macos-wheels
+        path: wheelhouse/*.whl
+
+    - name: Setup tmate session
+      if: ${{ failure() }}
+      uses: mxschmitt/action-tmate@v3

make.inc.gh_macos_arm64_whl

@@ -0,0 +1,28 @@
+# Makefile variable overrides for Mac OSX compilation with CLANG.
+CFLAGS = -O3 -arch arm64
+
+CXX=clang++
+CC=clang
+
+OMP_ROOT = $(shell brew --prefix libomp)
+# taken from makefile...
+CFLAGS   += -I include -I/usr/local/include -I/opt/homebrew/include -I$(OMP_ROOT)/include -target arm64-apple-macos11
+FFLAGS   = $(CFLAGS)
+CXXFLAGS = $(CFLAGS)
+LIBS += -L/usr/local/lib -L/opt/homebrew/lib -L$(OMP_ROOT)/lib -target arm64-apple-macos11 -arch arm64
+
+# OpenMP with clang needs following...
+OMPFLAGS = -Xpreprocessor -fopenmp
+OMPLIBS = -L/usr/local/lib -L/opt/homebrew/lib -lomp
+# since fftw3_omp doesn't work in OSX, we need...
+FFTWOMPSUFFIX=threads
+
+
+# MATLAB interface: this will probably segfault. Instead we suggest you use
+# make.inc.macosx_clang_matlab
+
+# Some of these will depend on your FFTW library location...
+MFLAGS += -I/usr/local/include -I/opt/homebrew/include -L/usr/local/lib -L/opt/homebrew/lib -lm
+# may need to edit for your MATLAB version location...
+MEX = $(shell ls -d /Applications/MATLAB_R20**.app)/bin/mex
+# Also see docs/install.rst for possible edits to MATLAB's MEX XML file.