use format string attributes for functions accepting va_list params, too

include/SDL_log.h

@@ -352,7 +352,7 @@ extern DECLSPEC void SDLCALL SDL_LogMessage(int category,
  */
 extern DECLSPEC void SDLCALL SDL_LogMessageV(int category,
                                              SDL_LogPriority priority,
-                                             const char *fmt, va_list ap);
+                                             SDL_PRINTF_FORMAT_STRING const char *fmt, va_list ap) SDL_PRINTF_VARARG_FUNCV(3);
 
 /**
  * The prototype for the log output callback function.

include/SDL_stdinc.h

@@ -336,7 +336,9 @@ typedef uint64_t Uint64;
 #define SDL_PRINTF_FORMAT_STRING
 #define SDL_SCANF_FORMAT_STRING
 #define SDL_PRINTF_VARARG_FUNC( fmtargnumber )
+#define SDL_PRINTF_VARARG_FUNCV( fmtargnumber )
 #define SDL_SCANF_VARARG_FUNC( fmtargnumber )
+#define SDL_SCANF_VARARG_FUNCV( fmtargnumber )
 #else
 #if defined(_MSC_VER) && (_MSC_VER >= 1600) /* VS 2010 and above */
 #include <sal.h>
@@ -362,10 +364,14 @@ typedef uint64_t Uint64;
 #endif
 #if defined(__GNUC__)
 #define SDL_PRINTF_VARARG_FUNC( fmtargnumber ) __attribute__ (( format( __printf__, fmtargnumber, fmtargnumber+1 )))
+#define SDL_PRINTF_VARARG_FUNCV( fmtargnumber ) __attribute__(( format( __printf__, fmtargnumber, 0 )))
 #define SDL_SCANF_VARARG_FUNC( fmtargnumber ) __attribute__ (( format( __scanf__, fmtargnumber, fmtargnumber+1 )))
+#define SDL_SCANF_VARARG_FUNCV( fmtargnumber ) __attribute__(( format( __scanf__, fmtargnumber, 0 )))
 #else
 #define SDL_PRINTF_VARARG_FUNC( fmtargnumber )
+#define SDL_PRINTF_VARARG_FUNCV( fmtargnumber )
 #define SDL_SCANF_VARARG_FUNC( fmtargnumber )
+#define SDL_SCANF_VARARG_FUNCV( fmtargnumber )
 #endif
 #endif /* SDL_DISABLE_ANALYZE_MACROS */
 
@@ -603,11 +609,11 @@ extern DECLSPEC int SDLCALL SDL_strcasecmp(const char *str1, const char *str2);
 extern DECLSPEC int SDLCALL SDL_strncasecmp(const char *str1, const char *str2, size_t len);
 
 extern DECLSPEC int SDLCALL SDL_sscanf(const char *text, SDL_SCANF_FORMAT_STRING const char *fmt, ...) SDL_SCANF_VARARG_FUNC(2);
-extern DECLSPEC int SDLCALL SDL_vsscanf(const char *text, const char *fmt, va_list ap);
+extern DECLSPEC int SDLCALL SDL_vsscanf(const char *text, SDL_SCANF_FORMAT_STRING const char *fmt, va_list ap) SDL_SCANF_VARARG_FUNCV(2);
 extern DECLSPEC int SDLCALL SDL_snprintf(SDL_OUT_Z_CAP(maxlen) char *text, size_t maxlen, SDL_PRINTF_FORMAT_STRING const char *fmt, ... ) SDL_PRINTF_VARARG_FUNC(3);
-extern DECLSPEC int SDLCALL SDL_vsnprintf(SDL_OUT_Z_CAP(maxlen) char *text, size_t maxlen, const char *fmt, va_list ap);
+extern DECLSPEC int SDLCALL SDL_vsnprintf(SDL_OUT_Z_CAP(maxlen) char *text, size_t maxlen, SDL_PRINTF_FORMAT_STRING const char *fmt, va_list ap) SDL_PRINTF_VARARG_FUNCV(3);
 extern DECLSPEC int SDLCALL SDL_asprintf(char **strp, SDL_PRINTF_FORMAT_STRING const char *fmt, ...) SDL_PRINTF_VARARG_FUNC(2);
-extern DECLSPEC int SDLCALL SDL_vasprintf(char **strp, const char *fmt, va_list ap);
+extern DECLSPEC int SDLCALL SDL_vasprintf(char **strp, SDL_PRINTF_FORMAT_STRING const char *fmt, va_list ap) SDL_PRINTF_VARARG_FUNCV(2);
 
 #ifndef HAVE_M_PI
 #ifndef M_PI