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authorEric Blake <eblake@redhat.com>2016-04-05 21:35:03 -0600
committerPaolo Bonzini <pbonzini@redhat.com>2016-04-08 00:07:43 +0200
commit8c6597123af4abdd632d79ba5a40856d77a11505 (patch)
treedfec75662656799687b5cae60462ed18ae5fdfb7 /nbd/nbd-internal.h
parentc0301fcc811432a587f6f94fee08d7965c1671d0 (diff)
nbd: Avoid bitrot in TRACE() usage
The compiler is smart enough to optimize out 'if (0)', but won't type-check our printfs if they are hidden behind #if. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <1459913704-19949-3-git-send-email-eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'nbd/nbd-internal.h')
-rw-r--r--nbd/nbd-internal.h15
1 files changed, 9 insertions, 6 deletions
diff --git a/nbd/nbd-internal.h b/nbd/nbd-internal.h
index d09b4ee308..379153561d 100644
--- a/nbd/nbd-internal.h
+++ b/nbd/nbd-internal.h
@@ -33,18 +33,21 @@
/* #define DEBUG_NBD */
#ifdef DEBUG_NBD
-#define TRACE(msg, ...) do { \
- LOG(msg, ## __VA_ARGS__); \
-} while(0)
+#define DEBUG_NBD_PRINT 1
#else
-#define TRACE(msg, ...) \
- do { } while (0)
+#define DEBUG_NBD_PRINT 0
#endif
+#define TRACE(msg, ...) do { \
+ if (DEBUG_NBD_PRINT) { \
+ LOG(msg, ## __VA_ARGS__); \
+ } \
+} while (0)
+
#define LOG(msg, ...) do { \
fprintf(stderr, "%s:%s():L%d: " msg "\n", \
__FILE__, __FUNCTION__, __LINE__, ## __VA_ARGS__); \
-} while(0)
+} while (0)
/* This is all part of the "official" NBD API.
*