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Add support for building and publishing Windows ARM64 wheels #872

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6bb3f49
Add CI support for publishing Windows ARM64 Wheels
MugundanMCW Oct 12, 2026
05b4a67
Update xfail condition for Windows platform in tests
MugundanMCW Oct 12, 2026
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11 changes: 10 additions & 1 deletion .github/workflows/wheel.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,7 @@ jobs:
fail-fast: false
matrix:
# macos-15-large is an intel runner, macos-14 is an arm64 runner
os: [ubuntu-latest, ubuntu-22.04-arm, windows-latest, macos-15-large, macos-14]
os: [ubuntu-latest, ubuntu-22.04-arm, windows-latest, windows-11-arm, macos-15-large, macos-14]
env:
# on free-threaded builds also check that no extension re-enables the GIL
CIBW_TEST_COMMAND: python -c "import sys, sysconfig, numcodecs; assert not (sysconfig.get_config_var('Py_GIL_DISABLED') and sys._is_gil_enabled())"
Expand All @@ -34,6 +34,15 @@ jobs:
with:
submodules: true
fetch-depth: 0 # required for version resolution for nightly wheels

# Windows ARM64 builds fail immediately with the default GCC toolchain,
# so use LLVM Clang to build wheels instead.
- name: Configure Clang for Windows ARM64 Builds
if: matrix.os == 'windows-11-arm'
shell: pwsh
run: |
"CC=clang-cl" >> $env:GITHUB_ENV
"CXX=clang-cl" >> $env:GITHUB_ENV

- uses: pypa/cibuildwheel@v3.4.1

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3 changes: 2 additions & 1 deletion tests/test_pickles.py
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@@ -1,5 +1,6 @@
import itertools
import sys
import platform

import numpy as np
import pytest
Expand Down Expand Up @@ -51,7 +52,7 @@ def test_repr():
# https://stackoverflow.com/questions/58194852/modulenotfounderror-no-module-named-numpy-core-multiarray-r
@pytest.mark.skipif(sys.byteorder != "little", reason="Pickle does not restore byte orders")
@pytest.mark.xfail(
sys.platform == "win32",
sys.platform == "win32" and platform.machine().lower() != "arm64",
reason=(
"Pickle fails to read w/ Windows carriage return "
"( https://github.com/zarr-developers/numcodecs/issues/271 )"
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