Improve use of compiler attributes

[tinc] / src / dropin.h

diff --git a/src/dropin.h b/src/dropin.h
index f020f21..6fa7a9d 100644 (file)
--- a/src/dropin.h
+++ b/src/dropin.h
@@ -26,8 +26,8 @@ extern int daemon(int, int);
 #endif
 
 #ifndef HAVE_ASPRINTF
-extern int asprintf(char **, const char *, ...);
-extern int vasprintf(char **, const char *, va_list ap);
+extern int asprintf(char **, const char *, ...) ATTR_FORMAT(printf, 2, 3);
+extern int vasprintf(char **, const char *, va_list ap) ATTR_FORMAT(printf, 2, 0);
 #endif
 
 #ifndef HAVE_GETTIMEOFDAY