* image.c (tiff_error_handler, tiff_warning_handler): Mark as

printf-like functions.
(tiff_load): Add casts to remove these marks before passing them
to system-supplied API.

src/ChangeLog

@@ -2,6 +2,11 @@
 	Fix more problems found by GCC 4.6.0's static checks.
+	* image.c (tiff_error_handler, tiff_warning_handler): Mark as
+	printf-like functions.
+	(tiff_load): Add casts to remove these marks before passing them
+	to system-supplied API.
+
 	* eval.c (Fsignal): Remove excess argument to 'fatal'.
 	* coding.c (EMIT_ONE_BYTE, EMIT_TWO_BYTES): Use unsigned, not int.

src/image.c

@@ -6714,6 +6714,8 @@ tiff_size_of_memory (thandle_t data)
 }
 
 
+static void tiff_error_handler (const char *, const char *, va_list)
+  ATTRIBUTE_FORMAT_PRINTF (2, 0);
 static void
 tiff_error_handler (const char *title, const char *format, va_list ap)
 {
@@ -6726,6 +6728,8 @@ tiff_error_handler (const char *title, const char *format, va_list ap)
 }
 
 
+static void tiff_warning_handler (const char *, const char *, va_list)
+  ATTRIBUTE_FORMAT_PRINTF (2, 0);
 static void
 tiff_warning_handler (const char *title, const char *format, va_list ap)
 {
@@ -6757,8 +6761,8 @@ tiff_load (struct frame *f, struct image *img)
   specified_file = image_spec_value (img->spec, QCfile, NULL);
   specified_data = image_spec_value (img->spec, QCdata, NULL);
 
-  fn_TIFFSetErrorHandler (tiff_error_handler);
-  fn_TIFFSetWarningHandler (tiff_warning_handler);
+  fn_TIFFSetErrorHandler ((TIFFErrorHandler) tiff_error_handler);
+  fn_TIFFSetWarningHandler ((TIFFErrorHandler) tiff_warning_handler);
 
   if (NILP (specified_data))
     {