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https://issues.apache.org/jira/browse/CASSPYTHON-5?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18051605#comment-18051605
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Brad Schoening commented on CASSPYTHON-5:
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[~absurdfarce] if win64 works, I'm fine with yanking win32.
> Win32 wheels do not include compiled libev modules
> --------------------------------------------------
>
> Key: CASSPYTHON-5
> URL: https://issues.apache.org/jira/browse/CASSPYTHON-5
> Project: Apache Cassandra Python driver
> Issue Type: Bug
> Reporter: Bret McGuire
> Priority: Normal
>
> Noticed while working on CASSPYTHON-3. Seems like it stems from a
> compilation issue on 32-bit platforms:
>
> {noformat}
> building 'cassandra.io.libevwrapper' extension
> creating build\temp.win32-cpython-39\Release\cassandra\io
> "C:\Program Files\Microsoft Visual
> Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\bin\HostX86\x86\cl.exe" /c
> /nologo /O2 /W3 /GL /DNDEBUG /MD
> -IC:\vcpkg\packages\libev_x64-windows\include\libev
> -IC:\Users\runneradmin\AppData\Local\Temp\build-env-e3vm6q30\include
> -IC:\Users\runneradmin\AppData\Local\pypa\cibuildwheel\Cache\nuget-cpython\pythonx86.3.9.13\tools\include
>
> -IC:\Users\runneradmin\AppData\Local\pypa\cibuildwheel\Cache\nuget-cpython\pythonx86.3.9.13\tools\Include
> "-IC:\Program Files\Microsoft Visual
> Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\include" "-IC:\Program
> Files\Microsoft Visual
> Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\ATLMFC\include"
> "-IC:\Program Files\Microsoft Visual
> Studio\2022\Enterprise\VC\Auxiliary\VS\include" "-IC:\Program Files
> (x86)\Windows Kits\10\include\10.0.26100.0\ucrt" "-IC:\Program Files
> (x86)\Windows Kits\10\\include\10.0.26100.0\\um" "-IC:\Program Files
> (x86)\Windows Kits\10\\include\10.0.26100.0\\shared" "-IC:\Program Files
> (x86)\Windows Kits\10\\include\10.0.26100.0\\winrt" "-IC:\Program Files
> (x86)\Windows Kits\10\\include\10.0.26100.0\\cppwinrt" "-IC:\Program Files
> (x86)\Windows Kits\NETFXSDK\4.8\include\um" /Tccassandra/io/libevwrapper.c
> /Fobuild\temp.win32-cpython-39\Release\cassandra\io\libevwrapper.obj
> libevwrapper.c
> "C:\Program Files\Microsoft Visual
> Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\bin\HostX86\x86\link.exe"
> /nologo /INCREMENTAL:NO /LTCG /DLL /MANIFEST:EMBED,ID=2 /MANIFESTUAC:NO
> /LIBPATH:C:\vcpkg\packages\libev_x64-windows\lib
> /LIBPATH:C:\Users\runneradmin\AppData\Local\Temp\build-env-e3vm6q30\libs
> /LIBPATH:C:\Users\runneradmin\AppData\Local\pypa\cibuildwheel\Cache\nuget-cpython\pythonx86.3.9.13\tools\libs
>
> /LIBPATH:C:\Users\runneradmin\AppData\Local\pypa\cibuildwheel\Cache\nuget-cpython\pythonx86.3.9.13\tools
>
> /LIBPATH:C:\Users\runneradmin\AppData\Local\Temp\build-env-e3vm6q30\PCbuild\win32
> "/LIBPATH:C:\Program Files\Microsoft Visual
> Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\ATLMFC\lib\x86"
> "/LIBPATH:C:\Program Files\Microsoft Visual
> Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\lib\x86"
> "/LIBPATH:C:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\lib\um\x86"
> "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.26100.0\ucrt\x86"
> "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\\lib\10.0.26100.0\\um\x86"
> ev.lib /EXPORT:PyInit_libevwrapper
> build\temp.win32-cpython-39\Release\cassandra\io\libevwrapper.obj
> /OUT:build\lib.win32-cpython-39\cassandra\io\libevwrapper.cp39-win32.pyd
> /IMPLIB:build\temp.win32-cpython-39\Release\cassandra\io\libevwrapper.cp39-win32.lib
> Creating library
> build\temp.win32-cpython-39\Release\cassandra\io\libevwrapper.cp39-win32.lib
> and object
> build\temp.win32-cpython-39\Release\cassandra\io\libevwrapper.cp39-win32.exp
> libevwrapper.obj : error LNK2001: unresolved external symbol _ev_io_stop
> libevwrapper.obj : error LNK2001: unresolved external symbol
> _ev_prepare_start
> libevwrapper.obj : error LNK2001: unresolved external symbol _ev_io_start
> libevwrapper.obj : error LNK2001: unresolved external symbol
> _ev_loop_destroy
> libevwrapper.obj : error LNK2001: unresolved external symbol _ev_loop_new
> libevwrapper.obj : error LNK2001: unresolved external symbol _ev_timer_again
> libevwrapper.obj : error LNK2001: unresolved external symbol _ev_run
> libevwrapper.obj : error LNK2001: unresolved external symbol _ev_async_start
> libevwrapper.obj : error LNK2001: unresolved external symbol
> _ev_prepare_stop
> libevwrapper.obj : error LNK2001: unresolved external symbol _ev_async_send
> libevwrapper.obj : error LNK2001: unresolved external symbol _ev_unref
> libevwrapper.obj : error LNK2001: unresolved external symbol _ev_timer_stop
> build\lib.win32-cpython-39\cassandra\io\libevwrapper.cp39-win32.pyd : fatal
> error LNK1120: 12 unresolved externals
> error: command 'C:\\Program Files\\Microsoft Visual
> Studio\\2022\\Enterprise\\VC\\Tools\\MSVC\\14.44.35207\\bin\\HostX86\\x86\\link.exe'
> failed with exit code 1120
>
> ERROR Backend subprocess exited when trying to invoke build_wheel
> Error: cibuildwheel: Command
> ['C:\\Users\\runneradmin\\AppData\\Local\\Temp\\cibw-run-k3x8x9gw\\cp39-win32\\build\\venv\\Scripts\\python.EXE',
> '-m', 'build',
> 'D:\\a\\python-driver-wheels\\python-driver-wheels\\python-driver',
> '--wheel',
> '--outdir=C:\\Users\\runneradmin\\AppData\\Local\\Temp\\cibw-run-k3x8x9gw\\cp39-win32\\built_wheel']
> failed with code 1. {noformat}
>
> These errors don't appear on the 64-bit builds for the same Windows platform.
> This is against libev 4.33; I haven't looked at this specific issue on the
> lib but my guess is there's limited 32-bit support there.
>
> Note that this has been the case for a while; the wheels for 3.29.3 also
> suffer from the same problem:
>
> {noformat}
> % unzip -l cassandra_driver-3.29.3-cp312-cp312-win32.whl| grep -i libev
> 13260 10-22-2025 00:04 cassandra/io/libevreactor.py
> 23056 10-22-2025 00:04 cassandra/io/libevwrapper.c
> % unzip -l cassandra_driver-3.29.3-cp312-cp312-win_amd64.whl| grep -i libev
> 13260 10-22-2025 00:04 cassandra/io/libevreactor.py
> 23056 10-22-2025 00:04 cassandra/io/libevwrapper.c
> 18944 10-22-2025 00:15
> cassandra/io/libevwrapper.cp312-win_amd64.pyd{noformat}
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