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Duplicate symbol _Py_jit_entry when built with --enable-exterimental-jit #144712
Description
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.
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
Activity
jjhelmus commented on Feb 11, 2026
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.
jjhelmus commented on Feb 11, 2026
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?
dlin09119-design commented on Feb 19, 2026
Merge branch 'main' into pythongh-144712
Merge branch 'main' into pythongh-144712
pythongh-144712: Fix _Py_jit_entry initializer after merge
pythongh-144712: Export _Py_jit_entry symbol via PyAPI_DATA
Merge branch 'main' into pythongh-144712
Merge branch 'main' into pythongh-144712
Merge branch 'main' into pythongh-144712
gh-144712: Export _Py_jit_entry symbol via PyAPI_DATA (#145840)