[Qemu-devel] [PATCH 23/43] page-cahe: made printf always compile in debug output

[Danil Antonov]

>From fc02b5cacabab0d1fc547167954abb7447bfef21 Mon Sep 17 00:00:00 2001
From: Danil Antonov <address@hidden>
Date: Wed, 29 Mar 2017 12:34:38 +0300
Subject: [PATCH 23/43] page-cahe: made printf always compile in debug output

Wrapped printf calls inside debug macros (DPRINTF) in `if` statement.
This will ensure that printf function will always compile even if debug
output is turned off and, in turn, will prevent bitrot of the format
strings.

Signed-off-by: Danil Antonov <address@hidden>
---
 page_cache.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/page_cache.c b/page_cache.c
index 5f85787..783a9a4 100644
--- a/page_cache.c
+++ b/page_cache.c
@@ -18,13 +18,16 @@
 #include "qemu/host-utils.h"
 #include "migration/page_cache.h"

-#ifdef DEBUG_CACHE
-#define DPRINTF(fmt, ...) \
-    do { fprintf(stdout, "cache: " fmt, ## __VA_ARGS__); } while (0)
-#else
-#define DPRINTF(fmt, ...) \
-    do { } while (0)
-#endif
+
+#ifndef DEBUG_CACHE
+#define DEBUG_CACHE 0
+#endif
+
+#define DPRINTF(fmt, ...) do {                          \
+    if (DEBUG_CACHE) {                                  \
+        fprintf(stderr, "cache: " fmt, ## __VA_ARGS__); \
+    }                                                   \
+} while (0);

 /* the page in cache will not be replaced in two cycles */
 #define CACHED_PAGE_LIFETIME 2
-- 
2.8.0.rc3