util: Add printf format GCC attribute to panic() function

This fixes the following GCC warning:

  util.h:55:2: warning: function might be possible candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 5 insertions, 1 deletions

diff --git a/compiler.h b/compiler.h
index 4180086..8153f56 100644
--- a/compiler.h
+++ b/compiler.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2015 Tobias Klauser <tklauser@distanz.ch>
+ * Copyright (C) 2015-2017 Tobias Klauser <tklauser@distanz.ch>
  *
  * This file is part of llmnrd.
  *
@@ -28,6 +28,10 @@
 # ifndef __unused
 #  define __unused		__attribute__((unused))
 # endif
+# ifndef __check_format_printf
+#  define __check_format_printf(__fmt, __args)	\
+				__attribute__ ((format (printf, (__fmt), (__args))))
+# endif
 # ifndef offsetof
 #  define offsetof(a, b)	__builtin_offsetof(a, b)
 # endif