[devel] Simplified the PNG_UNUSED macro.

ANNOUNCE

@@ -109,7 +109,7 @@ Version 1.5.1beta10 [January 27, 2010]
     argument names file_gamma, int_file_gamma, and srgb_intent consistently.
 
 Version 1.5.1beta11 [January 27, 2011]
-  Changed PNG_UNUSED from "param=param;" to "(void)(param ? 0 : 0));" (Cosmin)
+  Changed PNG_UNUSED from "param=param;" to "{(void)param;}".
 
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CHANGES

@@ -3225,7 +3225,7 @@ Version 1.5.1beta10 [January 27, 2010]
     argument names file_gamma, int_file_gamma, and srgb_intent consistently.
 
 Version 1.5.1beta11 [January 27, 2011]
-  Changed PNG_UNUSED from "param=param;" to "(void)(param ? 0 : 0));" (Cosmin)
+  Changed PNG_UNUSED from "param=param;" to "{(void)param;}".
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit

pngpriv.h

@@ -89,13 +89,13 @@ typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp;
  * the terminating semicolon.
  */
 #ifndef PNG_UNUSED
-/* Different possiblities being discussed on png-mng-implement, Jan 2011 */
+#  define PNG_UNUSED(param) {(void)param;}
+/* Other possiblities being discussed on png-mng-implement, Jan 2011 */
 /* #  define PNG_UNUSED(param) param = param; */
-/* #  define PNG_UNUSED(param) if(param); */
+/* #  define PNG_UNUSED(param) if(param); */ /* gcc-4.2 warns about this one */
 /* #  define PNG_UNUSED(param) if(param){} */
 /* #  define PNG_UNUSED(param) {if(param){}} */
-/* #  define PNG_UNUSED(param) {(void)param;} */
-#  define PNG_UNUSED(param) ((void)(param ? 0 : 0));
+/* #  define PNG_UNUSED(param) ((void)(param ? 0 : 0)); */
 #endif
 
 /* Just a little check that someone hasn't tried to define something