Description

jjhelmus

opened on Feb 11, 2026

Issue body actions

Bug report

Bug description:

When building with the --enable-experimental-jit option, the _Py_jit_entry symbol is duplicated in Python/ceval.o and Modules/_testinternalcapi/interpreter.o preventing them from being linked into the same DSO.

The later symbol was added in #143944. This symbol should likely be marked as extern.

I found this issue when building 3.15.0a6 for python-build-standalone, astral-sh/python-build-standalone#981. The build is configured so that the _testinternalcapi module is statically linked into the interpreter.

Example build log

cpython-3.15> ld64.lld: error: duplicate symbol: _Py_jit_entry
cpython-3.15> >>> defined in Python/ceval.o
cpython-3.15> >>> defined in Modules/_testinternalcapi/interpreter.o
cpython-3.15> clang: error: linker command failed with exit code 1 (use -v to see invocation)

CPython versions tested on:

CPython main branch, 3.15

Operating systems tested on:

macOS

Linked PRs

• gh-144712 extern _Py_jit_entry in Modules/_testinternalcapi/interpreter.c #144713
• gh-144712: Export _Py_jit_entry symbol via PyAPI_DATA #145840

Activity

1. jjhelmus

   added

   type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

   on Feb 11, 2026
2. StanFromIreland

   added

   extension-modulesC modules in the Modules dirC modules in the Modules dir

   topic-JIT

   on Feb 11, 2026
3. jjhelmus commented on Feb 11, 2026

   

   jjhelmus

   on Feb 11, 2026

   ContributorAuthor

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   This is a bit tricky. When statically linking _testinternalcapi the symbol must not be duplicated and the second definition can be marked extern. In the more common case where _testinternalcapi is dynamic the symbol needs to be defined in the module because it is not a global.
4. jjhelmus commented on Feb 11, 2026

   

   jjhelmus

   on Feb 11, 2026

   ContributorAuthor

   More actions

   The declaration of _Py_jit_entry in Modules/_testinternalcapi/interpreter.c is unusual as it is NULL. I does not seem to be used for anything functionally but is needed to allow the extension to be properly linked. Should this be made more clear in the file?
5. dlin09119-design commented on Feb 19, 2026

   

   dlin09119-design

   on Feb 19, 2026 · Hidden as spam

   show commentMore actions
6. ashm-dev

   added a commit that references this issue on Apr 15, 2026

   Merge branch 'main' into pythongh-144712

   61840e1
7. ashm-dev

   added 2 commits that reference this issue on Apr 29, 2026

   Merge branch 'main' into pythongh-144712

   d7a1a08

   pythongh-144712: Fix _Py_jit_entry initializer after merge

   082a57e
8. ashm-dev

   added 2 commits that reference this issue on May 19, 2026

   pythongh-144712: Export _Py_jit_entry symbol via PyAPI_DATA

   00c9eb3

   Merge branch 'main' into pythongh-144712

   a553b9f
9. ashm-dev

   added a commit that references this issue on Aug 24, 2026

   Merge branch 'main' into pythongh-144712

   cf15bb6
10. ashm-dev

    added a commit that references this issue on Sep 17, 2026

    Merge branch 'main' into pythongh-144712

    519d58b
11. diegorusso

    added a commit that references this issue on Sep 17, 2026

    gh-144712: Export _Py_jit_entry symbol via PyAPI_DATA (#145840)

    e8c06d6

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