add support for building wheels for windows on arm64

README.md

@@ -22,16 +22,17 @@ Python wheels are great. Building them across **Mac, Linux, Windows**, on **mult
 What does it do?
 ----------------
 
-|   | macOS Intel | macOS Apple Silicon | Windows 64bit | Windows 32bit | manylinux<br/>musllinux x86_64 | manylinux<br/>musllinux i686 | manylinux<br/>musllinux aarch64 | manylinux<br/>musllinux ppc64le | manylinux<br/>musllinux s390x |
-|---------------|----|-----|-----|-----|----|-----|----|-----|-----|
-| CPython 3.6   | ✅ | N/A | ✅  | ✅  | ✅ | ✅  | ✅ | ✅  | ✅  |
-| CPython 3.7   | ✅ | N/A | ✅  | ✅  | ✅ | ✅  | ✅ | ✅  | ✅  |
-| CPython 3.8   | ✅ | ✅  | ✅  | ✅  | ✅ | ✅  | ✅ | ✅  | ✅  |
-| CPython 3.9   | ✅ | ✅  | ✅  | ✅  | ✅ | ✅  | ✅ | ✅  | ✅  |
-| CPython 3.10  | ✅ | ✅  | ✅  | ✅  | ✅ | ✅  | ✅ | ✅  | ✅  |
-| PyPy 3.7 v7.3 | ✅ | N/A | ✅  | N/A | ✅¹ | ✅¹  | ✅¹ | N/A | N/A |
+|   | macOS Intel | macOS Apple Silicon | Windows 64bit | Windows 32bit | Windows Arm64 | manylinux<br/>musllinux x86_64 | manylinux<br/>musllinux i686 | manylinux<br/>musllinux aarch64 | manylinux<br/>musllinux ppc64le | manylinux<br/>musllinux s390x |
+|---------------|----|-----|-----|-----|-----|----|-----|----|-----|-----|
+| CPython 3.6   | ✅ | N/A | ✅  | ✅  | N/A | ✅  | ✅  | ✅ | ✅  | ✅  |
+| CPython 3.7   | ✅ | N/A | ✅  | ✅  | N/A | ✅ |✅  | ✅ | ✅  | ✅  |
+| CPython 3.8   | ✅ | ✅  | ✅  | ✅   | N/A | ✅ | ✅  | ✅ | ✅  | ✅  |
+| CPython 3.9   | ✅ | ✅  | ✅  | ✅  | ✅² | ✅ | ✅  | ✅ | ✅  | ✅  |
+| CPython 3.10  | ✅ | ✅  | ✅  | ✅  | ✅² | ✅ | ✅  | ✅ | ✅  | ✅  |
+| PyPy 3.7 v7.3 | ✅ | N/A | ✅  | N/A | N/A | ✅¹ | ✅¹  | ✅¹ | N/A | N/A |
 
 <sup>¹ PyPy is only supported for manylinux wheels.</sup><br>
+<sup>² Windows arm64 support is experimental.</sup><br>
 
 - Builds manylinux, musllinux, macOS 10.9+, and Windows wheels for CPython and PyPy
 - Works on GitHub Actions, Azure Pipelines, Travis CI, AppVeyor, CircleCI, and GitLab CI

bin/update_pythons.py

@@ -28,7 +28,7 @@
 RESOURCES_DIR: Final[Path] = DIR / "cibuildwheel/resources"
 
 
-ArchStr = Literal["32", "64"]
+ArchStr = Literal["32", "64", "ARM64"]
 
 
 class ConfigWinCP(TypedDict):
@@ -68,8 +68,8 @@ def __init__(self, arch_str: ArchStr) -> None:
             if resource["@type"] == "PackageBaseAddress/3.0.0":
                 endpoint = resource["@id"]
 
-        ARCH_DICT = {"32": "win32", "64": "win_amd64"}
-        PACKAGE_DICT = {"32": "pythonx86", "64": "python"}
+        ARCH_DICT = {"32": "win32", "64": "win_amd64", "ARM64": "win_arm64"}
+        PACKAGE_DICT = {"32": "pythonx86", "64": "python", "ARM64": "pythonarm64"}
 
         self.arch_str = arch_str
         self.arch = ARCH_DICT[arch_str]
@@ -237,6 +237,7 @@ class AllVersions:
     def __init__(self) -> None:
         self.windows_32 = WindowsVersions("32")
         self.windows_64 = WindowsVersions("64")
+        self.windows_arm64 = WindowsVersions("ARM64")
         self.windows_pypy_64 = PyPyVersions("64")
 
         self.macos_cpython = CPythonVersions()
@@ -264,6 +265,9 @@ def update_config(self, config: dict[str, str]) -> None:
                 config_update = self.windows_64.update_version_windows(spec)
             elif identifier.startswith("pp"):
                 config_update = self.windows_pypy_64.update_version_windows(spec)
+        elif "win_arm64" in identifier:
+            if identifier.startswith("cp"):
+                config_update = self.windows_arm64.update_version_windows(spec)
 
         assert config_update is not None, f"{identifier} not found!"
         config.update(**config_update)

cibuildwheel/architecture.py

@@ -29,6 +29,7 @@ class Architecture(Enum):
     # windows archs
     x86 = "x86"
     AMD64 = "AMD64"
+    ARM64 = "ARM64"
 
     # Allow this to be sorted
     def __lt__(self, other: "Architecture") -> bool:
@@ -83,7 +84,7 @@ def all_archs(platform: PlatformName) -> "Set[Architecture]":
         elif platform == "macos":
             return {Architecture.x86_64, Architecture.arm64, Architecture.universal2}
         elif platform == "windows":
-            return {Architecture.x86, Architecture.AMD64}
+            return {Architecture.x86, Architecture.AMD64, Architecture.ARM64}
         else:
             assert_never(platform)
 

cibuildwheel/logger.py

@@ -27,6 +27,7 @@
     "musllinux_s390x": "manylinux s390x",
     "win32": "Windows 32bit",
     "win_amd64": "Windows 64bit",
+    "win_arm64": "Windows on ARM 64bit",
     "macosx_x86_64": "macOS x86_64",
     "macosx_universal2": "macOS Universal 2 - x86_64 and arm64",
     "macosx_arm64": "macOS arm64 - Apple Silicon",

cibuildwheel/resources/build-platforms.toml

@@ -87,6 +87,8 @@ python_configurations = [
   { identifier = "cp39-win_amd64", version = "3.9.8", arch = "64" },
   { identifier = "cp310-win32", version = "3.10.0", arch = "32" },
   { identifier = "cp310-win_amd64", version = "3.10.0", arch = "64" },
+  { identifier = "cp39-win_arm64", version = "3.9.9", arch = "ARM64" },
+  { identifier = "cp310-win_arm64", version = "3.10.0", arch = "ARM64" },
   { identifier = "pp37-win_amd64", version = "3.7", arch = "64", url = "https://downloads.python.org/pypy/pypy3.7-v7.3.7-win64.zip" },
   { identifier = "pp38-win_amd64", version = "3.8", arch = "64", url = "https://downloads.python.org/pypy/pypy3.8-v7.3.7-win64.zip" },
 ]

cibuildwheel/windows.py

@@ -7,6 +7,8 @@
 from typing import Dict, List, NamedTuple, Optional, Sequence, Set
 from zipfile import ZipFile
 
+from packaging.version import Version
+
 from .architecture import Architecture
 from .environment import ParsedEnvironment
 from .logger import log
@@ -43,9 +45,8 @@ def shell(
 
 
 def get_nuget_args(version: str, arch: str) -> List[str]:
-    python_name = "python"
-    if arch == "32":
-        python_name += "x86"
+    platform_suffix = {"32": "x86", "64": "", "ARM64": "arm64"}
+    python_name = "python" + platform_suffix[arch]
     return [
         python_name,
         "-Version",
@@ -73,10 +74,7 @@ def get_python_configurations(
 
     python_configurations = [PythonConfiguration(**item) for item in full_python_configs]
 
-    map_arch = {
-        "32": Architecture.x86,
-        "64": Architecture.AMD64,
-    }
+    map_arch = {"32": Architecture.x86, "64": Architecture.AMD64, "ARM64": Architecture.ARM64}
 
     # skip builds as required
     python_configurations = [
@@ -189,10 +187,33 @@ def setup_python(
     # Install pip
 
     requires_reinstall = not (installation_path / "Scripts" / "pip.exe").exists()
+
     if requires_reinstall:
         # maybe pip isn't installed at all. ensurepip resolves that.
         call(["python", "-m", "ensurepip"], env=env, cwd=CIBW_INSTALL_PATH)
 
+    # pip older than 21.3 builds executables such as pip.exe for x64 platform.
+    # The first re-install of pip updates pip module but builds pip.exe using
+    # the old pip which still generates x64 executable. But the second
+    # re-install uses updated pip and correctly builds pip.exe for the target.
+    # This can be removed once ARM64 Pythons (currently 3.9 and 3.10) bundle
+    # pip versions newer than 21.3.
+    if python_configuration.arch == "ARM64" and Version(get_pip_version(env)) < Version("21.3"):
+        call(
+            [
+                "python",
+                "-m",
+                "pip",
+                "install",
+                "--force-reinstall",
+                "--upgrade",
+                "pip",
+                *dependency_constraint_flags,
+            ],
+            env=env,
+            cwd=CIBW_INSTALL_PATH,
+        )
+
     # upgrade pip to the version matching our constraints
     # if necessary, reinstall it to ensure that it's available on PATH as 'pip.exe'
     call(

docs/options.md

@@ -206,8 +206,8 @@ When setting the options, you can use shell-style globbing syntax, as per [fnmat
 | Python 3.6   | cp36-macosx_x86_64                                                     | cp36-win_amd64<br/>cp36-win32    | cp36-manylinux_x86_64<br/>cp36-manylinux_i686<br/>cp36-musllinux_x86_64<br/>cp36-musllinux_i686     | cp36-manylinux_aarch64<br/>cp36-manylinux_ppc64le<br/>cp36-manylinux_s390x<br/>cp36-musllinux_aarch64<br/>cp36-musllinux_ppc64le<br/>cp36-musllinux_s390x       |
 | Python 3.7   | cp37-macosx_x86_64                                                     | cp37-win_amd64<br/>cp37-win32    | cp37-manylinux_x86_64<br/>cp37-manylinux_i686<br/>cp37-musllinux_x86_64<br/>cp37-musllinux_i686     | cp37-manylinux_aarch64<br/>cp37-manylinux_ppc64le<br/>cp37-manylinux_s390x<br/>cp37-musllinux_aarch64<br/>cp37-musllinux_ppc64le<br/>cp37-musllinux_s390x       |
 | Python 3.8   | cp38-macosx_x86_64<br/>cp38-macosx_universal2<br/>cp38-macosx_arm64    | cp38-win_amd64<br/>cp38-win32    | cp38-manylinux_x86_64<br/>cp38-manylinux_i686<br/>cp38-musllinux_x86_64<br/>cp38-musllinux_i686     | cp38-manylinux_aarch64<br/>cp38-manylinux_ppc64le<br/>cp38-manylinux_s390x<br/>cp38-musllinux_aarch64<br/>cp38-musllinux_ppc64le<br/>cp38-musllinux_s390x       |
-| Python 3.9   | cp39-macosx_x86_64<br/>cp39-macosx_universal2<br/>cp39-macosx_arm64    | cp39-win_amd64<br/>cp39-win32    | cp39-manylinux_x86_64<br/>cp39-manylinux_i686<br/>cp39-musllinux_x86_64<br/>cp39-musllinux_i686     | cp39-manylinux_aarch64<br/>cp39-manylinux_ppc64le<br/>cp39-manylinux_s390x<br/>cp39-musllinux_aarch64<br/>cp39-musllinux_ppc64le<br/>cp39-musllinux_s390x       |
-| Python 3.10  | cp310-macosx_x86_64<br/>cp310-macosx_universal2<br/>cp310-macosx_arm64 | cp310-win_amd64<br/>cp310-win32  | cp310-manylinux_x86_64<br/>cp310-manylinux_i686<br/>cp310-musllinux_x86_64<br/>cp310-musllinux_i686 | cp310-manylinux_aarch64<br/>cp310-manylinux_ppc64le<br/>cp310-manylinux_s390x<br/>cp310-musllinux_aarch64<br/>cp310-musllinux_ppc64le<br/>cp310-musllinux_s390x |
+| Python 3.9   | cp39-macosx_x86_64<br/>cp39-macosx_universal2<br/>cp39-macosx_arm64    | cp39-win_amd64<br/>cp39-win32<br/>cp39-win_arm64    | cp39-manylinux_x86_64<br/>cp39-manylinux_i686<br/>cp39-musllinux_x86_64<br/>cp39-musllinux_i686     | cp39-manylinux_aarch64<br/>cp39-manylinux_ppc64le<br/>cp39-manylinux_s390x<br/>cp39-musllinux_aarch64<br/>cp39-musllinux_ppc64le<br/>cp39-musllinux_s390x       |
+| Python 3.10  | cp310-macosx_x86_64<br/>cp310-macosx_universal2<br/>cp310-macosx_arm64 | cp310-win_amd64<br/>cp310-win32<br/>cp310-win_arm64   | cp310-manylinux_x86_64<br/>cp310-manylinux_i686<br/>cp310-musllinux_x86_64<br/>cp310-musllinux_i686 | cp310-manylinux_aarch64<br/>cp310-manylinux_ppc64le<br/>cp310-manylinux_s390x<br/>cp310-musllinux_aarch64<br/>cp310-musllinux_ppc64le<br/>cp310-musllinux_s390x |
 | PyPy3.7 v7.3 | pp37-macosx_x86_64                                                     | pp37-win_amd64                   | pp37-manylinux_x86_64<br/>pp37-manylinux_i686                                                       | pp37-manylinux_aarch64                                                                                                                                          |
 | PyPy3.8 v7.3 | pp38-macosx_x86_64                                                     | pp38-win_amd64                   | pp38-manylinux_x86_64<br/>pp38-manylinux_i686                                                       | pp38-manylinux_aarch64                                                                                                                                          |
 
@@ -216,6 +216,8 @@ The format is `python_tag-platform_tag`, with tags similar to those in [PEP 425]
 
 For CPython, the minimally supported macOS version is 10.9; for PyPy 3.7, macOS 10.13 or higher is required.
 
+Windows arm64 platform support is experimental.
+
 See the [cibuildwheel 1 documentation](https://cibuildwheel.readthedocs.io/en/1.x/) for past end of life versions of Python, and PyPy2.7.
 
 #### Examples

unit_test/main_tests/main_platform_test.py

@@ -178,7 +178,11 @@ def test_archs_platform_all(platform, intercepted_build_args, monkeypatch):
             Architecture.s390x,
         }
     elif platform == "windows":
-        assert options.globals.architectures == {Architecture.x86, Architecture.AMD64}
+        assert options.globals.architectures == {
+            Architecture.x86,
+            Architecture.AMD64,
+            Architecture.ARM64,
+        }
     elif platform == "macos":
         assert options.globals.architectures == {
             Architecture.x86_64,