--- old/src/share/vm/runtime/os.hpp	2018-07-13 12:03:30.309382093 -0700
+++ new/src/share/vm/runtime/os.hpp	2018-07-13 12:03:30.202372491 -0700
@@ -616,6 +616,9 @@
   static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib,
                                    const char *syms[], size_t syms_len);
 
+  static int vsnprintf(char* buf, size_t len, const char* fmt, va_list args) ATTRIBUTE_PRINTF(3, 0);
+  static int snprintf(char* buf, size_t len, const char* fmt, ...) ATTRIBUTE_PRINTF(3, 4);
+
   // Print out system information; they are called by fatal error handler.
   // Output format may be different on different platforms.
   static void print_os_info(outputStream* st);