feat: add Pyodide support

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Hood Chatham <roberthoodchatham@gmail.com>
Co-authored-by: Matthieu Darbois <mayeut@users.noreply.github.com>

.github/workflows/test.yml

@@ -148,3 +148,38 @@ jobs:
     - name: Run the emulation tests
       run: |
         pytest --run-emulation test/test_emulation.py
+
+  test-pyodide:
+    name: Test cibuildwheel building pyodide wheels
+    needs: lint
+    runs-on: ubuntu-20.04
+    timeout-minutes: 180
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-python@v4
+      name: Install Python 3.11
+      with:
+        python-version: '3.11'
+
+
+    - name: Install dependencies
+      run: |
+        python -m pip install ".[test]"
+
+    - name: Generate a sample project
+      run: |
+        python -m test.test_projects test.test_0_basic.basic_project sample_proj
+
+    - name: Run a sample build (GitHub Action)
+      uses: ./
+      with:
+        package-dir: sample_proj
+        output-dir: wheelhouse
+      env:
+        CIBW_PLATFORM: pyodide
+
+    - name: Run tests with 'CIBW_PLATFORM' set to 'pyodide'
+      run: |
+        python ./bin/run_tests.py
+      env:
+        CIBW_PLATFORM: pyodide

README.md

@@ -45,6 +45,7 @@ What does it do?
 - Works on GitHub Actions, Azure Pipelines, Travis CI, AppVeyor, CircleCI, GitLab CI, and Cirrus CI
 - Bundles shared library dependencies on Linux and macOS through [auditwheel](https://github.com/pypa/auditwheel) and [delocate](https://github.com/matthew-brett/delocate)
 - Runs your library's tests against the wheel-installed version of your library
+- Can also build pyodide wheels for web deployment (experimental, not supported on PyPI yet) with `--platform pyodide`
 
 See the [cibuildwheel 1 documentation](https://cibuildwheel.pypa.io/en/1.x/) if you need to build unsupported versions of Python, such as Python 2.
 

cibuildwheel/__main__.py

@@ -15,6 +15,7 @@
 import cibuildwheel
 import cibuildwheel.linux
 import cibuildwheel.macos
+import cibuildwheel.pyodide
 import cibuildwheel.util
 import cibuildwheel.windows
 from cibuildwheel._compat.typing import assert_never
@@ -45,7 +46,7 @@ def main() -> None:
 
     parser.add_argument(
         "--platform",
-        choices=["auto", "linux", "macos", "windows"],
+        choices=["auto", "linux", "macos", "windows", "pyodide"],
         default=None,
         help="""
             Platform to build for. Use this option to override the
@@ -176,6 +177,8 @@ def _compute_platform_only(only: str) -> PlatformName:
         return "macos"
     if "win_" in only or "win32" in only:
         return "windows"
+    if "pyodide_" in only:
+        return "pyodide"
     print(
         f"Invalid --only='{only}', must be a build selector with a known platform",
         file=sys.stderr,
@@ -246,6 +249,8 @@ def get_platform_module(platform: PlatformName) -> PlatformModule:
         return cibuildwheel.windows
     if platform == "macos":
         return cibuildwheel.macos
+    if platform == "pyodide":
+        return cibuildwheel.pyodide
     assert_never(platform)
 
 

cibuildwheel/architecture.py

@@ -15,6 +15,7 @@
     "linux": "Linux",
     "macos": "macOS",
     "windows": "Windows",
+    "pyodide": "Pyodide",
 }
 
 ARCH_SYNONYMS: Final[list[dict[PlatformName, str | None]]] = [
@@ -46,6 +47,9 @@ class Architecture(Enum):
     AMD64 = "AMD64"
     ARM64 = "ARM64"
 
+    # WebAssembly
+    wasm32 = "wasm32"
+
     # Allow this to be sorted
     def __lt__(self, other: Architecture) -> bool:
         return self.value < other.value
@@ -75,6 +79,9 @@ def parse_config(config: str, platform: PlatformName) -> set[Architecture]:
     def auto_archs(platform: PlatformName) -> set[Architecture]:
         native_machine = platform_module.machine()
 
+        if platform == "pyodide":
+            return {Architecture.wasm32}
+
         # Cross-platform support. Used for --print-build-identifiers or docker builds.
         host_platform: PlatformName = (
             "windows"
@@ -120,6 +127,7 @@ def all_archs(platform: PlatformName) -> set[Architecture]:
             },
             "macos": {Architecture.x86_64, Architecture.arm64, Architecture.universal2},
             "windows": {Architecture.x86, Architecture.AMD64, Architecture.ARM64},
+            "pyodide": {Architecture.wasm32},
         }
         return all_archs_map[platform]
 

cibuildwheel/logger.py

@@ -34,6 +34,7 @@
     "macosx_x86_64": "macOS x86_64",
     "macosx_universal2": "macOS Universal 2 - x86_64 and arm64",
     "macosx_arm64": "macOS arm64 - Apple Silicon",
+    "pyodide_wasm32": "Pyodide v0.23.x",
 }