gh-129819: Allow tier2/JIT and tailcall (GH-129820)

Misc/NEWS.d/next/Build/2025-02-11-08-06-44.gh-issue-129819.7rn4dY.rst

@@ -0,0 +1 @@
+Allow building the JIT with the tailcall interpreter.

Python/ceval_macros.h

@@ -397,7 +397,7 @@ do {                                                   \
     stack_pointer = _PyFrame_GetStackPointer(frame);   \
     if (next_instr == NULL) {                          \
         next_instr = frame->instr_ptr;                 \
-        goto error;                                    \
+        JUMP_TO_LABEL(error);                          \
     }                                                  \
     DISPATCH();                                        \
 } while (0)

configure

@@ -29284,18 +29284,6 @@ esac
 fi
 
 
-# Do not enable tail-calling interpreter if tier 2 is enabled.
-if ${tier2_flags:+false} :
-then :
-
-    case "$ac_cv_tail_call" in yes*)
-
-printf "%s\n" "#define Py_TAIL_CALL_INTERP 1" >>confdefs.h
-
-    esac
-
-fi
-
 
 case $ac_sys_system in
 AIX*)

configure.ac

@@ -7033,19 +7033,6 @@ fi
 ],
 [AC_MSG_RESULT([no value specified])])
 
-# Do not enable tail-calling interpreter if tier 2 is enabled.
-AS_VAR_IF(
-  [tier2_flags],
-  [],
-  [
-    case "$ac_cv_tail_call" in yes*)
-      AC_DEFINE([Py_TAIL_CALL_INTERP], [1],
-      [Define if the C compiler supports efficient proper tail calls.])
-    esac
-  ],
-  []
-)
-
 
 case $ac_sys_system in
 AIX*)

pyconfig.h.in

@@ -1718,7 +1718,7 @@
 /* The version of SunOS/Solaris as reported by `uname -r' without the dot. */
 #undef Py_SUNOS_VERSION
 
-/* Define if the C compiler supports efficient proper tail calls. */
+/* Define if you want to use tail-calling interpreters in CPython. */
 #undef Py_TAIL_CALL_INTERP
 
 /* Define if you want to enable tracing references for debugging purpose */