2 files changed, 9 insertions, 0 deletions
diff --git a/trace.c b/trace.c
index 82c00f1..04dbae6 100644
--- a/trace.c
+++ b/trace.c
@@ -10,6 +10,7 @@
 
 enum pack_trace pack_trace = PACK_TRACE_OFF;
 
+ATTRIBUTE_FORMAT(printf, 2, 0)
 static void trace(enum pack_trace level, const char *fmt, va_list va)
 {
 	char *type;
diff --git a/trace.h b/trace.h
index cef9927..8dee696 100644
--- a/trace.h
+++ b/trace.h
@@ -5,7 +5,15 @@
 #ifndef PACK_TRACE_H
 #define PACK_TRACE_H
 
+#ifdef DEVEL
+#define ATTRIBUTE_FORMAT(type, fmt, args) __attribute__((format(type, fmt, args)))
+#else
+#define ATTRIBUTE_FORMAT(type, fmt, args)
+#endif
+
+ATTRIBUTE_FORMAT(printf, 1, 2)
 void tr_call(const char *fmt, ...);
+ATTRIBUTE_FORMAT(printf, 1, 2)
 void tr_debug(const char *fmt, ...);
 
 #endif // !PACK_TRACE_H