bpo-31370: Remove support for threads-less builds (#3385)

* Remove Setup.config
* Always define WITH_THREAD for compatibility.

1 files changed, 9 insertions, 15 deletions

diff --git a/Lib/trace.py b/Lib/trace.py
index e443edd6061..48a1d1b6a91 100755
--- a/Lib/trace.py
+++ b/Lib/trace.py
@@ -61,21 +61,15 @@ import dis
 import pickle
 from time import monotonic as _time
 
-try:
-    import threading
-except ImportError:
-    _settrace = sys.settrace
-
-    def _unsettrace():
-        sys.settrace(None)
-else:
-    def _settrace(func):
-        threading.settrace(func)
-        sys.settrace(func)
-
-    def _unsettrace():
-        sys.settrace(None)
-        threading.settrace(None)
+import threading
+
+def _settrace(func):
+    threading.settrace(func)
+    sys.settrace(func)
+
+def _unsettrace():
+    sys.settrace(None)
+    threading.settrace(None)
 
 PRAGMA_NOCOVER = "#pragma NO COVER"