Properly disable tailcall interp in configure

Author: Fidget-Spinner

Lib/test/test_generated_cases.py

@@ -5235,7 +5235,7 @@ dummy_func(
             }
 #endif
             RELOAD_STACK();
-#ifdef Py_TAIL_CALL_INTERP
+#if Py_TAIL_CALL_INTERP
             int opcode;
 #endif
             DISPATCH();
@@ -5277,7 +5277,7 @@ dummy_func(
             assert(!_PyErr_Occurred(tstate));
         #endif
             RELOAD_STACK();
-#ifdef Py_TAIL_CALL_INTERP
+#if Py_TAIL_CALL_INTERP
             int opcode;
 #endif
             DISPATCH();

Python/bytecodes.c

@@ -764,7 +764,7 @@ _PyObjectArray_Free(PyObject **array, PyObject **scratch)
 #define PY_EVAL_C_STACK_UNITS 2
 
 
-#ifdef Py_TAIL_CALL_INTERP
+#if Py_TAIL_CALL_INTERP
 #include "opcode_targets.h"
 #include "generated_cases.c.h"
 #endif
@@ -847,7 +847,7 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int
         next_instr = frame->instr_ptr;
         stack_pointer = _PyFrame_GetStackPointer(frame);
         monitor_throw(tstate, frame, next_instr);
-#ifdef Py_TAIL_CALL_INTERP
+#if Py_TAIL_CALL_INTERP
         return _TAIL_CALL_error(frame, stack_pointer, tstate, next_instr, 0);
 #else
         goto error;
@@ -860,7 +860,7 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int
     const _PyUOpInstruction *next_uop = NULL;
 #endif
 
-#ifdef Py_TAIL_CALL_INTERP
+#if Py_TAIL_CALL_INTERP
     return _TAIL_CALL_start_frame(frame, NULL, tstate, NULL, 0);
 #else
     goto start_frame;

Python/ceval.c

@@ -73,7 +73,7 @@
 #define TAIL_CALL_PARAMS _PyInterpreterFrame *frame, _PyStackRef *stack_pointer, PyThreadState *tstate, _Py_CODEUNIT *next_instr, int oparg
 #define TAIL_CALL_ARGS frame, stack_pointer, tstate, next_instr, oparg
 
-#ifdef Py_TAIL_CALL_INTERP
+#if Py_TAIL_CALL_INTERP
     // Note: [[clang::musttail]] works for GCC 15, but not __attribute__((musttail)) at the moment.
 #   define Py_MUSTTAIL [[clang::musttail]]
 #   define Py_PRESERVE_NONE_CC __attribute__((preserve_none))