Building with cibuildwheel / pyodide results in "Python config failure: Python is 64-bit, chosen compiler is 32-bit" #1120
Description
Hi,
We're trying to use our python package in the browser using pyodide.
We're using scikit_build_core.setuptools.build_meta as the build backend. I ran cibuildwheel --platform pyodide . from my repo (on a linux machine), and got the error "Python config failure: Python is 64-bit, chosen compiler is 32-bit".
I know scikit-build-core supports WASM, so I'd like to see if I'm missing anything or if this is a bug.
A snippet from my pyproject.toml:
[build-system]
requires = ["scikit-build-core<0.12.0", "setuptools", "setuptools_scm"]
build-backend = "scikit_build_core.setuptools.build_meta"
[tool.setuptools.packages.find]
where=["."]
include=["myrepo*"]
[tool.setuptools.dynamic]
version = {attr = "myrepo._version.__version__"}
[tool.scikit-build]
cmake.build-type = "Release"
editable.verbose=false
# https://cibuildwheel.pypa.io/en/stableoptions/
[tool.cibuildwheel]
build-frontend = "build[uv]"
Full error:
configure: cmake -DCMAKE_C_COMPILER=/tmp/tmpuxjd2rpt/cc -DCMAKE_CXX_COMPILER=/tmp/tmpuxjd2rpt/c++ -DCMAKE_AR=/tmp/tmpuxjd2rpt/ar -DCMAKE_C_COMPILER_AR=/tmp/tmpuxjd2rpt/ar -DCMAKE_CXX_COMPILER_AR=/tmp/tmpuxjd2rpt/ar --fresh -S. -Bbuild/temp.emscripten_3_1_46_wasm32-cpython-310/_skbuild -DCMAKE_BUILD_TYPE:STRING=Release -Cbuild/temp.emscripten_3_1_46_wasm32-cpython-310/_skbuild/CMakeInit.txt -DCMAKE_INSTALL_PREFIX=build/lib.emscripten_3_1_46_wasm32-cpython-310 -DCMAKE_MAKE_PROGRAM=ninja -DCMAKE_CROSSCOMPILING_EMULATOR=/home/adiw/code/emsdk/node/22.16.0_64bit/bin/node
loading initial cache file build/temp.emscripten_3_1_46_wasm32-cpython-310/_skbuild/CMakeInit.txt
CMake Deprecation Warning at build/temp.emscripten_3_1_46_wasm32-cpython-310/_skbuild/_deps/pybind11-src/CMakeLists.txt:13 (cmake_minimum_required):
Compatibility with CMake < 3.10 will be removed from a future version of
CMake.
Update the VERSION argument <min> value. Or, use the <min>...<max> syntax
to tell CMake that the project requires at least <min> but has been updated
to work with policies introduced by <max> or earlier.
-- pybind11 v2.13.6
-- Found PythonInterp: /tmp/build-env-62vjaez4/bin/python (found suitable version "3.10.12", minimum required is "3.7")
CMake Error at build/temp.emscripten_3_1_46_wasm32-cpython-310/_skbuild/_deps/pybind11-src/tools/FindPythonLibsNew.cmake:214 (message):
Python config failure: Python is 64-bit, chosen compiler is 32-bit
Call Stack (most recent call first):
build/temp.emscripten_3_1_46_wasm32-cpython-310/_skbuild/_deps/pybind11-src/tools/pybind11Tools.cmake:50 (find_package)
build/temp.emscripten_3_1_46_wasm32-cpython-310/_skbuild/_deps/pybind11-src/tools/pybind11Common.cmake:228 (include)
build/temp.emscripten_3_1_46_wasm32-cpython-310/_skbuild/_deps/pybind11-src/CMakeLists.txt:251 (include)
-- Configuring incomplete, errors occurred!
emcmake: error: 'cmake -DCMAKE_C_COMPILER=/tmp/tmpuxjd2rpt/cc -DCMAKE_CXX_COMPILER=/tmp/tmpuxjd2rpt/c++ -DCMAKE_AR=/tmp/tmpuxjd2rpt/ar -DCMAKE_C_COMPILER_AR=/tmp/tmpuxjd2rpt/ar -DCMAKE_CXX_COMPILER_AR=/tmp/tmpuxjd2rpt/ar --fresh -S. -Bbuild/temp.emscripten_3_1_46_wasm32-cpython-310/_skbuild -DCMAKE_BUILD_TYPE:STRING=Release -Cbuild/temp.emscripten_3_1_46_wasm32-cpython-310/_skbuild/CMakeInit.txt -DCMAKE_INSTALL_PREFIX=build/lib.emscripten_3_1_46_wasm32-cpython-310 -DCMAKE_MAKE_PROGRAM=ninja -DCMAKE_CROSSCOMPILING_EMULATOR=/home/adiw/code/emsdk/node/22.16.0_64bit/bin/node' failed (returned 1)
Traceback (most recent call last):
File "/home/adiw/code/myrepo/venv/lib/python3.10/site-packages/pyproject_hooks/_in_process/_in_process.py", line 389, in <module>
main()
File "/home/adiw/code/myrepo/venv/lib/python3.10/site-packages/pyproject_hooks/_in_process/_in_process.py", line 373, in main
json_out["return_val"] = hook(**hook_input["kwargs"])
File "/home/adiw/code/myrepo/venv/lib/python3.10/site-packages/pyproject_hooks/_in_process/_in_process.py", line 280, in build_wheel
return _build_backend().build_wheel(
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/setuptools/build_meta.py", line 432, in build_wheel
return _build(['bdist_wheel'])
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/setuptools/build_meta.py", line 423, in _build
return self._build_with_temp_dir(
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/setuptools/build_meta.py", line 404, in _build_with_temp_dir
self.run_setup()
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/setuptools/build_meta.py", line 317, in run_setup
exec(code, locals())
File "<string>", line 22, in <module>
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/setuptools/__init__.py", line 115, in setup
return distutils.core.setup(**attrs)
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/setuptools/_distutils/core.py", line 186, in setup
return run_commands(dist)
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/setuptools/_distutils/core.py", line 202, in run_commands
dist.run_commands()
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/setuptools/_distutils/dist.py", line 1002, in run_commands
self.run_command(cmd)
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/setuptools/dist.py", line 1102, in run_command
super().run_command(command)
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/setuptools/_distutils/dist.py", line 1021, in run_command
cmd_obj.run()
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/setuptools/command/bdist_wheel.py", line 370, in run
self.run_command("build")
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/setuptools/_distutils/cmd.py", line 357, in run_command
self.distribution.run_command(command)
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/setuptools/dist.py", line 1102, in run_command
super().run_command(command)
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/setuptools/_distutils/dist.py", line 1021, in run_command
cmd_obj.run()
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/setuptools/_distutils/command/build.py", line 135, in run
self.run_command(cmd_name)
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/setuptools/_distutils/cmd.py", line 357, in run_command
self.distribution.run_command(command)
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/setuptools/dist.py", line 1102, in run_command
super().run_command(command)
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/setuptools/_distutils/dist.py", line 1021, in run_command
cmd_obj.run()
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/scikit_build_core/setuptools/build_cmake.py", line 166, in run
builder.configure(
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/scikit_build_core/builder/builder.py", line 294, in configure
self.config.configure(
File "/tmp/build-env-62vjaez4/lib/python3.10/site-packages/scikit_build_core/cmake.py", line 262, in configure
raise FailedLiveProcessError(msg) from None
scikit_build_core.errors.FailedLiveProcessError: CMake configuration failed
ERROR Backend subprocess exited when trying to invoke build_wheel