gallium debug: Add gcc printf hint to debug_printf

This causes gcc to issue warnings when format parameters do not match up
with the format string in calls to debug_printf.

Signed-off-by: Nicolai Hähnle <nhaehnle@gmail.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/src/gallium/auxiliary/util/u_debug.h b/src/gallium/auxiliary/util/u_debug.h
index 1380d98d7e..b82e7cb4d4 100644
--- a/src/gallium/auxiliary/util/u_debug.h
+++ b/src/gallium/auxiliary/util/u_debug.h
@@ -65,6 +65,11 @@ extern "C" {
 #define __FUNCTION__ "???"
 #endif
 
+#if defined(__GNUC__)
+#define _util_printf_format(fmt, list) __attribute__ ((format (printf, fmt, list)))
+#else
+#define _util_printf_format(fmt, list)
+#endif
 
 void _debug_vprintf(const char *format, va_list ap);
    
@@ -82,14 +87,17 @@ _debug_printf(const char *format, ...)
 /**
  * Print debug messages.
  *
- * The actual channel used to output debug message is platform specific. To 
- * avoid misformating or truncation, follow these rules of thumb:   
+ * The actual channel used to output debug message is platform specific. To
+ * avoid misformating or truncation, follow these rules of thumb:
  * - output whole lines
- * - avoid outputing large strings (512 bytes is the current maximum length 
+ * - avoid outputing large strings (512 bytes is the current maximum length
  * that is guaranteed to be printed in all platforms)
  */
 #if !defined(PIPE_OS_HAIKU)
 static INLINE void
+debug_printf(const char *format, ...) _util_printf_format(1,2);
+
+static INLINE void
 debug_printf(const char *format, ...)
 {
 #ifdef DEBUG