Fix Issue 12604 - Use a proper no-op macro expansion for VTRACE macro in _sre.c

diff --git a/Modules/_sre.c b/Modules/_sre.c
index 200e8dd95f45a73697ceaedfcb263ecfff0a51ce..cd9591796283a0dfd0c99c7bcc14c172cea5c6f8 100644 (file)
--- a/Modules/_sre.c
+++ b/Modules/_sre.c
@@ -2744,7 +2744,7 @@ _compile(PyObject* self_, PyObject* args)
 #if defined(VVERBOSE)
 #define VTRACE(v) printf v
 #else
-#define VTRACE(v)
+#define VTRACE(v) do {} while(0)  /* do nothing */
 #endif
 
 /* Report failure */