Fix test and keep test_frozenmain.h stable

Author: colesbury

Lib/test/test_code.py

@@ -571,14 +571,11 @@ def f(a='str_value'):
         self.assertIsInterned(f())
 
     @cpython_only
+    @unittest.skipIf(Py_GIL_DISABLED, "free-threaded build interns all string constants")
     def test_interned_string_with_null(self):
         co = compile(r'res = "str\0value!"', '?', 'exec')
         v = self.find_const(co.co_consts, 'str\0value!')
-        if Py_GIL_DISABLED:
-            # The free-threaded build interns all string constants
-            self.assertIsInterned(v)
-        else:
-            self.assertIsNotInterned(v)
+        self.assertIsNotInterned(v)
 
     @cpython_only
     @unittest.skipUnless(Py_GIL_DISABLED, "does not intern all constants")

Objects/codeobject.c

@@ -110,7 +110,7 @@ should_intern_string(PyObject *o)
     // unless we've disabled immortalizing objects that use deferred reference
     // counting.
     PyInterpreterState *interp = _PyInterpreterState_GET();
-    if (!interp->gc.immortalize.enable_on_thread_created) {
+    if (interp->gc.immortalize.enable_on_thread_created) {
         return 1;
     }
 #endif

Programs/freeze_test_frozenmain.py

@@ -2,7 +2,6 @@
 import tokenize
 import os.path
 import sys
-from test.support import suppress_immortalization
 
 PROGRAM_DIR = os.path.dirname(__file__)
 SRC_DIR = os.path.dirname(PROGRAM_DIR)
@@ -25,11 +24,7 @@ def dump(fp, filename, name):
 
     with tokenize.open(filename) as source_fp:
         source = source_fp.read()
-        # The output of marshal can depend on the reference count so suppress
-        # immortalization in the free-threaded build to keep the output
-        # consistent with the default build.
-        with suppress_immortalization():
-            code = compile(source, code_filename, 'exec')
+        code = compile(source, code_filename, 'exec')
 
     data = marshal.dumps(code)
     writecode(fp, name, data)

Python/bltinmodule.c

@@ -866,8 +866,21 @@ builtin_compile_impl(PyObject *module, PyObject *source, PyObject *filename,
     if (str == NULL)
         goto error;
 
+#ifdef Py_GIL_DISABLED
+    // gh-118527: Disable immortalization of code constants for explicit
+    // compile() calls to get consistent frozen outputs between the default
+    // and free-threaded builds.
+    PyInterpreterState *interp = _PyInterpreterState_GET();
+    int old_value = interp->gc.immortalize.enable_on_thread_created;
+    interp->gc.immortalize.enable_on_thread_created = 0;
+#endif
+
     result = Py_CompileStringObject(str, filename, start[compile_mode], &cf, optimize);
 
+#ifdef Py_GIL_DISABLED
+    interp->gc.immortalize.enable_on_thread_created = old_value;
+#endif
+
     Py_XDECREF(source_copy);
     goto finally;