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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Duplicate symbol _Py_jit_entry when built with --enable-exterimental-jit","articleBody":"# Bug report\n\n### Bug description:\n\nWhen 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.\n\nThe later symbol was added in #143944. This symbol should likely be marked as `extern`.\n\nI 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. \n\n[Example build log](https://github.com/astral-sh/python-build-standalone/actions/runs/21909181789/job/63257981473)\n```\ncpython-3.15> ld64.lld: error: duplicate symbol: _Py_jit_entry\ncpython-3.15> >>> defined in Python/ceval.o\ncpython-3.15> >>> defined in Modules/_testinternalcapi/interpreter.o\ncpython-3.15> clang: error: linker command failed with exit code 1 (use -v to see invocation)\n```\n\n### CPython versions tested on:\n\nCPython main branch, 3.15\n\n### Operating systems tested on:\n\nmacOS\n\n\u003c!-- gh-linked-prs -->\n### Linked PRs\n* gh-144713\n* gh-145840\n\u003c!-- /gh-linked-prs -->\n","author":{"url":"https://github.com/jjhelmus","@type":"Person","name":"jjhelmus"},"datePublished":"2026-02-11T15:42:41Z","url":"https://github.com/python/cpython/issues/144712"}