Add command-line tests for enabling TLBC

Lib/test/test_cmd_line.py

@@ -1084,6 +1084,23 @@ def test(x, y):
         assert_python_ok("-W", "always", "-X", "tlbc=0", "-c", code)
         assert_python_ok("-W", "always", "-c", code, PYTHON_TLBC="0")
 
+    @unittest.skipUnless(support.Py_GIL_DISABLED,
+                         "PYTHON_TLBC and -X tlbc"
+                         " only supported in Py_GIL_DISABLED builds")
+    @threading_helper.requires_working_threading()
+    def test_enable_thread_local_bytecode(self):
+        code = """if 1:
+            import threading
+            def test(x, y):
+                return x + y
+            t = threading.Thread(target=test, args=(1,2))
+            t.start()
+            t.join()"""
+        # The functionality of thread-local bytecode is tested more extensively
+        # in test_thread_local_bytecode
+        assert_python_ok("-W", "always", "-X", "tlbc=1", "-c", code)
+        assert_python_ok("-W", "always", "-c", code, PYTHON_TLBC="1")
+
     @unittest.skipUnless(support.Py_GIL_DISABLED,
                          "PYTHON_TLBC and -X tlbc"
                          " only supported in Py_GIL_DISABLED builds")