Fix printf formats

src/log-utils.h

 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_LOG_UTILS_H_
 #define V8_LOG_UTILS_H_
 
 #include <stdio.h>
 
 #include <cstdarg>
 
 #include "src/allocation.h"
+#include "src/base/compiler-specific.h"
 #include "src/base/platform/mutex.h"
 #include "src/flags.h"
 
 namespace v8 {
 namespace internal {
 
 class Logger;
 
 // Functions and data for performing output of log messages.
 class Log {
@@ skipping 32 matching lines @@
   // Utility class for formatting log messages. It fills the message into the
   // static buffer in Log.
   class MessageBuilder BASE_EMBEDDED {
    public:
     // Create a message builder starting from position 0.
     // This acquires the mutex in the log as well.
     explicit MessageBuilder(Log* log);
     ~MessageBuilder() { }
 
     // Append string data to the log message.
-    void Append(const char* format, ...);
+    void PRINTF_FORMAT(2, 3) Append(const char* format, ...);
 
     // Append string data to the log message.
-    void AppendVA(const char* format, va_list args);
+    void PRINTF_FORMAT(2, 0) AppendVA(const char* format, va_list args);
 
     // Append a character to the log message.
     void Append(const char c);
 
     // Append double quoted string to the log message.
     void AppendDoubleQuotedString(const char* string);
 
     // Append a heap string.
     void Append(String* str);
 
@@ skipping 56 matching lines @@
   Logger* logger_;
 
   friend class Logger;
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_LOG_UTILS_H_