tests: run on pyodide

Signed-off-by: Henry Schreiner <[email protected]>

.github/workflows/emscripten.yaml

@@ -0,0 +1,58 @@
+name: WASM
+
+on:
+  workflow_dispatch:
+  pull_request:
+    branches:
+    - master
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build-wasm-emscripten:
+    name: Pyodide wheel
+    runs-on: ubuntu-22.04
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        submodules: true
+        fetch-depth: 0
+
+    - uses: actions/setup-python@v4
+      with:
+        python-version: "3.11"
+
+    - name: Install pyodide-build
+      run: pip install pyodide-build==0.23.4
+
+    - name: Compute emsdk version
+      id: compute-emsdk-version
+      run: |
+        # Prepare xbuild environment (side-effect)
+        pyodide config list
+        # Save EMSDK version
+        EMSCRIPTEN_VERSION=$(pyodide config get emscripten_version)
+        echo "emsdk-version=$EMSCRIPTEN_VERSION" >> $GITHUB_OUTPUT
+
+    - uses: mymindstorm/setup-emsdk@v12
+      with:
+        version: ${{ steps.compute-emsdk-version.outputs.emsdk-version }}
+        actions-cache-folder: emsdk-cache
+
+    - name: Build
+      run: PYODIDE_BUILD_EXPORTS=whole_archive CFLAGS=-fexceptions LDFLAGS=-fexceptions pyodide build
+      working-directory: tests
+
+    - uses: actions/setup-node@v3
+      with:
+        node-version: 18
+
+    - name: Set up Pyodide virtual environment
+      run: |
+        pyodide venv .venv-pyodide
+        .venv-pyodide/bin/pip install $(echo -n tests/dist/*.whl)
+
+    - name: Test
+      run: .venv-pyodide/bin/pytest

include/pybind11/pybind11.h

@@ -222,7 +222,7 @@ class cpp_function : public function {
 
         /* Dispatch code which converts function arguments and performs the actual function call */
         rec->impl = [](function_call &call) -> handle {
-            cast_in args_converter;
+            cast_in args_converter{};
 
             /* Try to cast the function arguments into the C++ domain */
             if (!args_converter.load_args(call)) {

pyproject.toml

@@ -39,7 +39,7 @@ log_cli_level = "info"
 testpaths = [
     "tests",
 ]
-timeout=300
+# timeout=300
 
 
 [tool.pylint]

tests/CMakeLists.txt

@@ -88,7 +88,12 @@ set(PYBIND11_TEST_FILTER
 if(CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
   # We're being loaded directly, i.e. not via add_subdirectory, so make this
   # work as its own project and load the pybind11Config to get the tools we need
-  find_package(pybind11 REQUIRED CONFIG)
+
+  if(SKBUILD)
+    add_subdirectory(.. pybind11_src)
+  else()
+    find_package(pybind11 REQUIRED CONFIG)
+  endif()
 endif()
 
 if(NOT CMAKE_BUILD_TYPE AND NOT DEFINED CMAKE_CONFIGURATION_TYPES)
@@ -488,6 +493,9 @@ foreach(target ${test_targets})
       endforeach()
     endif()
   endif()
+  if(SKBUILD)
+    install(TARGETS ${target} LIBRARY DESTINATION .)
+  endif()
 endforeach()
 
 # Provide nice organisation in IDEs

tests/pyproject.toml

@@ -0,0 +1,11 @@
+# Warning: this is currently used for pyodide, and is not a general out-of-tree
+# builder for the tests (yet). Specifically, wheels can't be built from SDists.
+
+[build-system]
+requires = ["scikit-build-core[pyproject]"]
+build-backend = "scikit_build_core.build"
+
+[project]
+name = "pybind11_tests"
+version = "0.0.1"
+dependencies = ["pytest", "pytest-timeout"]

tests/test_embed/test_interpreter.py

@@ -1,5 +1,12 @@
 import sys
 
+import pytest
+
+if sys.platform.startswith("emscripten"):
+    pytest.skip(
+        "Test not implemented from single wheel on Pyodide", allow_module_level=True
+    )
+
 from widget_module import Widget
 
 

tests/test_embed/test_trampoline.py

@@ -1,3 +1,12 @@
+import sys
+
+import pytest
+
+if sys.platform.startswith("emscripten"):
+    pytest.skip(
+        "Test not implemented from single wheel on Pyodide", allow_module_level=True
+    )
+
 import trampoline_module