From 629b7fcfe54eb918ea53f063da2d1979da7ea1c4 Mon Sep 17 00:00:00 2001
From: rubidium <rubidium@openttd.org>
Date: Sat, 14 Nov 2009 11:57:55 +0000
Subject: [PATCH] (svn r18070) -Fix: some possible unwanted side effects if
 using some sorts of boolean expressions in DEBUG

---
 src/debug.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/debug.h b/src/debug.h
index 0355bf5920..b17597d801 100644
--- a/src/debug.h
+++ b/src/debug.h
@@ -29,7 +29,7 @@
 #ifdef NO_DEBUG_MESSAGES
 	#define DEBUG(name, level, ...) { }
 #else /* NO_DEBUG_MESSAGES */
-	#define DEBUG(name, level, ...) if (level == 0 || _debug_ ## name ## _level >= level) debug(#name, __VA_ARGS__)
+	#define DEBUG(name, level, ...) if ((level) == 0 || _debug_ ## name ## _level >= (level)) debug(#name, __VA_ARGS__)
 
 	extern int _debug_ai_level;
 	extern int _debug_driver_level;