gh-144712: Export _Py_jit_entry symbol via PyAPI_DATA

Author: ashm-dev

Include/internal/pycore_ceval.h

@@ -131,7 +131,7 @@ _Py_CODEUNIT *_PyTier2Interpreter(
 );
 #endif
 
-extern _PyJitEntryFuncPtr _Py_jit_entry;
+PyAPI_DATA(_PyJitEntryFuncPtr) _Py_jit_entry;
 
 extern PyObject*
 _PyEval_Vector(PyThreadState *tstate,

Misc/NEWS.d/next/Build/2026-03-11-17-23-39.gh-issue-144712.fix-jit-entry.rst

@@ -0,0 +1 @@
+Fix ``_testinternalcapi`` import failure due to missing ``_Py_jit_entry`` symbol when built with :option:`--enable-experimental-jit`. Patch by Shamil Abdulaev.

Modules/_testinternalcapi/interpreter.c

@@ -24,8 +24,6 @@ stop_tracing_and_jit(PyThreadState *tstate, _PyInterpreterFrame *frame)
 }
 #endif
 
-_PyJitEntryFuncPtr _Py_jit_entry;
-
 #if _Py_TAIL_CALL_INTERP
 #include "test_targets.h"
 #include "test_cases.c.h"

Python/ceval.c

@@ -1337,9 +1337,9 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int
 }
 #ifdef _Py_TIER2
 #ifdef _Py_JIT
-_PyJitEntryFuncPtr _Py_jit_entry = _PyJIT_Entry;
+PyAPI_DATA(_PyJitEntryFuncPtr) _Py_jit_entry = _PyJIT_Entry;
 #else
-_PyJitEntryFuncPtr _Py_jit_entry = _PyTier2Interpreter;
+PyAPI_DATA(_PyJitEntryFuncPtr) _Py_jit_entry = _PyTier2Interpreter;
 #endif
 #endif