squash -Wempty-body warnings from expanding trace() inside a conditional body

diff --git a/lib/expr/extoken.c b/lib/expr/extoken.c
index 8a6baa56824b331316abc75d65dfa7fa8f509067..2b748592c352e8ed7893fceb9acd58836926e2c6 100644 (file)
--- a/lib/expr/extoken.c
+++ b/lib/expr/extoken.c
@@ -253,7 +253,7 @@ extoken_fn(Expr_t* ex)
 
 #else
 
-#define trace(p,a,b,c)
+#define trace(p,a,b,c) do { } while (0)
 
 #endif