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GeezerVison is showing github.com — gh-148690: Build Windows freethreaded binaries into separate directory and include python3t.dll on GIL-enabled by zooba · Pull Request #149218 · python/cpython

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@zooba

@zooba zooba commented May 1, 2026 •
edited by bedevere-app Bot
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Based heavily on @encukou's work in #148912, split into a separate PR because I'm going to need my own branch for testing release process stuff.

  • Issue: Free-threaded and GIL-enabled Windows builds should share an abi3 libpython dll #148690

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encukou, chris-eibl, and stonebig reacted with heart emoji
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  • ❤️ 3 reactions
encukou and others added 15 commits April 23, 2026 12:21
@encukou
Link against python3t.lib
5db5a47
@encukou
Add ABI3T_COMPAT_DLLNAME
1153d48
@encukou
Build abi3t-compat\python3t.dll
fda3900
@encukou
Add abi3tcompat to MSI installer
96676cf
@ngoldbaum @encukou
minimal fix for build errors on Petr's PR
32083dd
@encukou
Merge in the main branch
e25d7ff
@encukou
Build python3.dll & python3t.dll separately, with fixed names
eb61469
@encukou
Don't use !(bindpath.build)
92ae703
@encukou @zooba @ngoldbaum
Apply suggestions from code review
3dc7bc1 
Co-authored-by: Steve Dower <[email protected]>
Co-authored-by: Nathan Goldbaum <[email protected]>
@encukou
Look for python3t.dll without the directory too
b64ad2c
@encukou
Merge in the main branch
9dd8cae
@encukou
PC/layout: Include python3t in GIL-ful builds
4bc0289
@encukou
Build in the abi3t-compat directory
8b2981e
@zooba
Build FT to separate directory. Start updating everything that depend…
1cb147a 
…s on that...
@zooba
Fix bindpath and simplify some settings
555d016
@zooba
zooba requested review from a team, FFY00 and ericsnowcurrently as code owners May 1, 2026 10:29
@bedevere-app bedevere-app Bot added the awaiting core review label May 1, 2026
@bedevere-app bedevere-app Bot mentioned this pull request May 1, 2026
Free-threaded and GIL-enabled Windows builds should share an abi3 libpython dll #148690
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@read-the-docs-community

read-the-docs-community Bot commented May 1, 2026 •
edited
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Documentation build overview

📚 cpython-previews | 🛠️ Build #32528719 | 📁 Comparing 57871e9 against main (f4f82f0)

  🔍 Preview build  

3 files changed
± library/email.policy.html
± whatsnew/3.15.html
± whatsnew/changelog.html
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zooba added 4 commits May 1, 2026 11:56
@zooba
Fix zlib-ng generator and MSI paths
90681fc
@zooba
Add NEWS and update rt.bat
4bf0990
@zooba
Merge from main
8529d44
@zooba
Fix venv
ee8d037
@zooba
zooba requested a review from vsajip as a code owner May 1, 2026 11:39
encukou
encukou reviewed May 1, 2026
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@encukou encukou left a comment

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Thank you for taking this on!

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Comment thread PCbuild/_testcapi.vcxproj Resolved

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Comment thread PCbuild/readme.txt Resolved

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@zooba
Revert unneeded changes
b40f782
@zooba

zooba commented May 1, 2026

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I have a test release build running at https://dev.azure.com/Python/cpython/_build/results?buildId=169826&view=results If anyone wants to grab the results (look on the artifacts page for msi, embed, nuget, and pymanager_bundle) and post success/failure, that'd be great (cc @ngoldbaum )
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@zooba

zooba commented May 1, 2026

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So far, I know that the PyManager packages are missing the python3t.dll (because I got the version check in PC/layout correct, but we haven't rev'd to that version yet, so it's "wrong" for testing). So far, I think the rest is looking good.
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@bedevere-bot

bedevere-bot commented May 1, 2026

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🤖 New build scheduled with the buildbot fleet by @zooba for commit de2da65 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F149218%2Fmerge

If you want to schedule another build, you need to add the 🔨 test-with-buildbots label again.
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@bedevere-bot bedevere-bot removed the 🔨 test-with-buildbots Test PR w/ buildbots; report in status section label May 1, 2026
@zooba

zooba commented May 1, 2026

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A buildbot run ought to flush out any of the remaining edge cases we have to worry about. Anything else will just have to be found in the beta, I guess.

If someone else wants to merge when it passes, feel free. I probably won't see any results until after the weekend, which is getting very close to release.
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@zooba zooba mentioned this pull request May 1, 2026
Add support for new build layout in Windows free-threaded builds python/release-tools#373
Merged
chris-eibl
chris-eibl reviewed May 2, 2026
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Comment thread PCbuild/pythoncore.vcxproj
<ClCompile Include="..\Python\dynload_win.c" />
<ClCompile Include="..\Python\dynload_win.c">
<PreprocessorDefinitions Condition="$(DisableGil) != 'true'">PY3_DLLNAME=L"$(Py3DllName)";%(PreprocessorDefinitions)</PreprocessorDefinitions>
<PreprocessorDefinitions>ABI3T_DLLNAME=L"$(Abi3tDllName)";%(PreprocessorDefinitions)</PreprocessorDefinitions>

@chris-eibl chris-eibl May 2, 2026

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Suggested change
<PreprocessorDefinitions>ABI3T_DLLNAME=L"$(Abi3tDllName)";%(PreprocessorDefinitions)</PreprocessorDefinitions>
<PreprocessorDefinitions Condition="$(DisableGil) != 'true'>ABI3T_DLLNAME=L"$(Abi3tDllName)";%(PreprocessorDefinitions)</PreprocessorDefinitions>

See also comment in dynload_win.c:

 * ABI3T_DLLNAME is undefined for free-threaded builds, and so this function is
 * a no-op (we assume that _Py_CheckPython3 has already been called).

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@zooba zooba May 4, 2026

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Hmm... I think it might be the comment that's out of date. If we add this condition, then no preprocessor value is ever set when the condition is false.

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@chris-eibl chris-eibl May 4, 2026

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Yupp, your current approach to dynload_win.c in 185a6d7 seems much better. I've just checked again copying python315t.dll from a local build into the intermingled msi layout and it also fixes the crash when importing Nathan's extension 👍

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@chris-eibl

chris-eibl commented May 2, 2026

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Thanks @zooba , @encukou and @ngoldbaum!

I've tried the most recent artifacts from https://dev.azure.com/Python/cpython/_build/results?buildId=169835&view=artifacts&pathAsName=false&type=publishedArtifacts

  • pymanager_amd64
  • pymanager_amd64_t
  • msi

and installed Nathan's limited_api-1.2.3-cp315-abi3.abi3t-win_amd64.whl. Everything fine except the ft case in the intermingled msi layout.

But using the resulting python315t.dll from a custom build with the fix I've suggested above, it works for me, too 🚀
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@encukou encukou mentioned this pull request May 4, 2026
gh-148690: Build abi3t-compat\python3.dll on Windows #148912
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@encukou

encukou commented May 4, 2026

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The Fedora failure is unrelated of course, but the nogil failures look concerning. In test_cext test_cppext test_peg_generator (PGO) or test_peg_generator only (2022) we get:

LINK : fatal error LNK1104: cannot open file 'python315t.lib'
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@zooba

zooba commented May 4, 2026

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the nogil failures look concerning

I think these tests just need updating for the new build output directory. I figured there'd be a few cases, but decided to flush them out in CI rather than tying up my laptop for all the tests 🙃
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@zooba
Update tests that build extensions
185a6d7
@zooba
zooba requested review from lysnikolaou and pablogsal as code owners May 4, 2026 15:17
@zooba

zooba commented May 4, 2026

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!buildbot .+Windows.+
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@bedevere-bot

bedevere-bot commented May 4, 2026

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🤖 New build scheduled with the buildbot fleet by @zooba for commit 185a6d7 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F149218%2Fmerge

The command will test the builders whose names match following regular expression: .+Windows.+

The builders matched are:

  • AMD64 Windows10 PR
  • AMD64 Windows11 Non-Debug PR
  • AMD64 Windows Server 2022 NoGIL PR
  • AMD64 Windows PGO PR
  • AMD64 Windows11 Refleaks PR
  • AMD64 Windows PGO Tailcall PR
  • AMD64 Windows11 Bigmem PR
  • AMD64 Windows PGO NoGIL PR
  • AMD64 Windows PGO NoGIL Tailcall PR
  • ARM64 Windows Non-Debug PR
  • ARM64 Windows PR
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zooba added 2 commits May 4, 2026 16:21
@zooba
Satisfy linter
57871e9
@zooba
Maybe satisfy mypy
ec2bf28
@encukou

encukou commented May 4, 2026

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I'll echo Zach's words: I see nothing that gives me pause here :)

Thanks for pushing this through!
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@ngoldbaum

ngoldbaum commented May 4, 2026

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Yes, thanks for making sure this is ready in time!
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@zooba

zooba commented May 4, 2026

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Yeah, clean buildbots are as good as we're going to get without shipping it. Thanks for all the help from everyone!
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@zooba
zooba merged commit 10f950c into python:main May 4, 2026
66 checks passed

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@bedevere-app bedevere-app Bot removed the awaiting core review label May 4, 2026
@bedevere-bot

bedevere-bot commented May 4, 2026

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⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot iOS ARM64 Simulator 3.x (tier-3) has failed when building commit 10f950c.

What do you need to do:

  1. Don't panic.
  2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
  3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/1380/builds/6540) and take a look at the build logs.
  4. Check if the failure is related to this commit (10f950c) or if it is a false positive.
  5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/1380/builds/6540

Summary of the results of the build (if available):

Click to see traceback logs 
remote: Enumerating objects: 104, done.        
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remote: Counting objects: 100% (104/104), done.        
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remote: Compressing objects: 100% (45/45), done.        
remote: Total 55 (delta 47), reused 15 (delta 10), pack-reused 0 (from 0)        
From https://github.com/python/cpython
 * branch                    main       -> FETCH_HEAD
Note: switching to '10f950c9bb0ff4583f361a42aaed562b330e1dba'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by switching back to a branch.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at 10f950c9bb0 gh-148690: Build Windows freethreaded binaries into separate directory and include python3t.dll on GIL-enabled (GH-149218)
Switched to and reset branch 'main'

configure: WARNING: no system libmpdec found; falling back to pure-Python version for the decimal module
configure: WARNING: pkg-config is missing. Some dependencies may not be detected correctly.

configure: WARNING: pkg-config is missing. Some dependencies may not be detected correctly.
ld: warning: ignoring duplicate libraries: '-lm'
In file included from ../../Modules/_remote_debugging/module.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../../Modules/_remote_debugging/gc_stats.c:7:
In file included from ../../Modules/_remote_debugging/gc_stats.h:14:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
In file included from ../../Modules/_remote_debugging/object_reading.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../../Modules/_remote_debugging/code_objects.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../../Modules/_remote_debugging/frames.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
1 warning generated.
In file included from ../../Modules/_remote_debugging/frame_cache.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
In file included from ../../Modules/_remote_debugging/threads.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
1 warning generated.
In file included from ../../Modules/_remote_debugging/asyncio.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../../Modules/_remote_debugging/binary_io_writer.c:13:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
In file included from ../../Modules/_remote_debugging/binary_io_reader.c:13:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../../Modules/_remote_debugging/subprocess.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../Modules/_remote_debugging/subprocess.c:100:1: warning: unused function 'find_children_bfs' [-Wunused-function]
  100 | find_children_bfs(pid_t target_pid, int recursive,
      | ^~~~~~~~~~~~~~~~~
2 warnings generated.
In file included from ../../Modules/_remote_debugging/interpreters.c:7:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
1 warning generated.
1 warning generated.
1 warning generated.
ld: warning: ignoring duplicate libraries: '-lm'
configure: WARNING: pkg-config is missing. Some dependencies may not be detected correctly.
ld: warning: ignoring duplicate libraries: '-lm'
In file included from ../../Modules/_remote_debugging/module.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../../Modules/_remote_debugging/gc_stats.c:7:
In file included from ../../Modules/_remote_debugging/gc_stats.h:14:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
In file included from ../../Modules/_remote_debugging/object_reading.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../../Modules/_remote_debugging/code_objects.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../../Modules/_remote_debugging/frames.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
1 warning generated.
1 warning generated.
In file included from ../../Modules/_remote_debugging/frame_cache.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../../Modules/_remote_debugging/threads.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
In file included from ../../Modules/_remote_debugging/asyncio.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
1 warning generated.
In file included from ../../Modules/_remote_debugging/binary_io_writer.c:13:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../../Modules/_remote_debugging/subprocess.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../Modules/_remote_debugging/subprocess.c:100:1: warning: unused function 'find_children_bfs' [-Wunused-function]
  100 | find_children_bfs(pid_t target_pid, int recursive,
      | ^~~~~~~~~~~~~~~~~
2 warnings generated.
In file included from ../../Modules/_remote_debugging/binary_io_reader.c:13:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../../Modules/_remote_debugging/interpreters.c:7:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
1 warning generated.
1 warning generated.
1 warning generated.
ld: warning: ignoring duplicate libraries: '-lm'
configure: WARNING: x86_64-apple-ios-simulator/clang is not supported
configure: WARNING: pkg-config is missing. Some dependencies may not be detected correctly.
configure: WARNING:

Platform "x86_64-apple-ios-simulator" with compiler "clang" is not supported by the
CPython core team, see https://peps.python.org/pep-0011/ for more information.

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.15.a(brc.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.15.a(dynamic_annotations.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.15.a(gc_free_threading.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.15.a(index_pool.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.15.a(jit.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.15.a(optimizer_analysis.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.15.a(optimizer_symbols.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.15.a(pystats.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.15.a(stackrefs.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.15.a(uniqueid.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.15.a(perf_jit_trampoline.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.15.a(jit_unwind.o) has no symbols
ld: warning: ignoring duplicate libraries: '-lm'
In file included from ../../Modules/_remote_debugging/gc_stats.c:7:
In file included from ../../Modules/_remote_debugging/gc_stats.h:14:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../../Modules/_remote_debugging/module.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
In file included from ../../Modules/_remote_debugging/object_reading.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
In file included from ../../Modules/_remote_debugging/code_objects.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../../Modules/_remote_debugging/frames.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../../Modules/_remote_debugging/frame_cache.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
1 warning generated.
1 warning generated.
In file included from ../../Modules/_remote_debugging/threads.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../../Modules/_remote_debugging/asyncio.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../../Modules/_remote_debugging/binary_io_writer.c:13:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
In file included from ../../Modules/_remote_debugging/subprocess.c:8:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../Modules/_remote_debugging/subprocess.c:100:1: warning: unused function 'find_children_bfs' [-Wunused-function]
  100 | find_children_bfs(pid_t target_pid, int recursive,
      | ^~~~~~~~~~~~~~~~~
1 warning generated.
2 warnings generated.
In file included from ../../Modules/_remote_debugging/interpreters.c:7:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
In file included from ../../Modules/_remote_debugging/binary_io_reader.c:13:
In file included from ../../Modules/_remote_debugging/_remote_debugging.h:34:
../../Modules/_remote_debugging/../../Python/remote_debug.h:165:1: warning: unused function '_Py_RemoteDebug_ValidatePyRuntimeCookie' [-Wunused-function]
  165 | _Py_RemoteDebug_ValidatePyRuntimeCookie(proc_handle_t *handle, uintptr_t address)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
1 warning generated.
1 warning generated.
ld: warning: ignoring duplicate libraries: '-lm'

--- xcodebuild: WARNING: Using the first of multiple matching destinations:
{ platform:iOS Simulator, id:4F9AFDE7-A49A-46AD-B161-FCA22E48EA55, OS:18.3.1, name:iPhone SE (3rd generation) }
{ platform:iOS Simulator, id:4F9AFDE7-A49A-46AD-B161-FCA22E48EA55, OS:18.3.1, name:iPhone SE (3rd generation) }
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@zooba
zooba deleted the gh-148690 branch May 5, 2026 13:35
@chris-eibl

chris-eibl commented May 7, 2026

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I've just tested the official 3.15 beta 1 binaries and get this error when loading Nathan's wheel:

(venv3.15) C:\>python
Python 3.15.0b1 (tags/v3.15.0b1:f31a89b, May  7 2026, 13:53:53) [MSC v.1950 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import limited
Traceback (most recent call last):
  File "<python-input-0>", line 1, in <module>
    import limited
  File "C:\Users\suc\venv3.15\Lib\site-packages\limited\__init__.py", line 1, in <module>
    from .limited import *
SystemError: invalid module slot 5 (Py_mp_subscript)
>>>

I think this is related to PEP 820 #149055 and the wheel just needs to be recompiled?
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@ngoldbaum

ngoldbaum commented May 7, 2026

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Yes, that's right. @mgorny is working on the update for the stable-abi-testing repo.
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@jjhelmus jjhelmus mentioned this pull request May 7, 2026
CPython 3.15.0a8 -> 3.15.0b1 astral-sh/python-build-standalone#1123
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@ngoldbaum

ngoldbaum commented May 8, 2026

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@chris-eibl here are updated wheel files. The first was generated using a GIL-enabled interpreter, the second with a free-threaded interpreter.

limited_api-1.2.3-cp315-abi3.abi3t-win_amd64.whl.gil-enabled.zip
limited_api-1.2.3-cp315-abi3.abi3t-win_amd64.whl.free-threaded.zip
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@chris-eibl

chris-eibl commented May 8, 2026

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Works great with the official 3.15b1 binaries 🚀

I can install, load and call add() for both of them in

  • pyinstaller based 3.15 and 3.15t installs
  • and a legacy install with 3.15 and 3.15t intermingled. Regardless which of those two wheels is installed, both interpreters can always load and run them 👍
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@bashonly bashonly mentioned this pull request Oct 29, 2026
Bundled modules with abi3.abi3t extensions are broken on Windows Python 3.15 pyinstaller/pyinstaller#9562
Closed
6 tasks done
@ck0i ck0i mentioned this pull request Oct 31, 2026
gh-150467: Fix linking python3.dll and python3t.dll with ASan on Windows #160992
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@zooba @ngoldbaum @bedevere-bot @chris-eibl @encukou @zware
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