--- a/js/src/builtin/Profilers.cpp
+++ b/js/src/builtin/Profilers.cpp
@@ -36,19 +36,17 @@ using namespace js;
 using mozilla::ArrayLength;
 
 /* Thread-unsafe error management */
 
 static char gLastError[2000];
 
 #if defined(__APPLE__) || defined(__linux__) || defined(MOZ_CALLGRIND)
 static void
-#ifdef __GNUC__
-__attribute__((format(printf,1,2)))
-#endif
+MOZ_FORMAT_PRINTF(1, 2)
 UnsafeError(const char* format, ...)
 {
     va_list args;
     va_start(args, format);
     (void) VsprintfLiteral(gLastError, format, args);
     va_end(args);
 }
 #endif

--- a/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h
+++ b/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h
@@ -181,20 +181,17 @@ namespace jit {
         GenericAssembler()
           : printer(NULL)
         {}
 
         void setPrinter(Sprinter* sp) {
             printer = sp;
         }
 
-        void spew(const char* fmt, ...)
-#ifdef __GNUC__
-            __attribute__ ((format (printf, 2, 3)))
-#endif
+        void spew(const char* fmt, ...) MOZ_FORMAT_PRINTF(2, 3)
         {
             if (MOZ_UNLIKELY(printer || JitSpewEnabled(JitSpew_Codegen))) {
                 va_list va;
                 va_start(va, fmt);
                 spew(fmt, va);
                 va_end(va);
             }
         }

--- a/mfbt/Sprintf.h
+++ b/mfbt/Sprintf.h
@@ -8,32 +8,31 @@
 
 #ifndef mozilla_Sprintf_h_
 #define mozilla_Sprintf_h_
 
 #include <stdio.h>
 #include <stdarg.h>
 
 #include "mozilla/Assertions.h"
+#include "mozilla/Attributes.h"
 
 #ifdef __cplusplus
 
 template <size_t N>
 int VsprintfLiteral(char (&buffer)[N], const char* format, va_list args)
 {
     MOZ_ASSERT(format != buffer);
     int result = vsnprintf(buffer, N, format, args);
     buffer[N - 1] = '\0';
     return result;
 }
 
 template <size_t N>
-#if defined(__GNUC__)
-  __attribute__((format(printf, 2, 3)))
-#endif
+MOZ_FORMAT_PRINTF(2, 3)
 int SprintfLiteral(char (&buffer)[N], const char* format, ...)
 {
   va_list args;
   va_start(args, format);
   int result = VsprintfLiteral(buffer, format, args);
   va_end(args);
   return result;
 }