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[devel] Fixed comments around PNG_UNUSED macro definition in pngpriv.h

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Glenn Randers-Pehrson 2011-01-28 15:14:43 -06:00
parent 4e7c47fb73
commit bf3293a3cb
1 changed files with 21 additions and 19 deletions
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40
pngpriv.h
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@ -86,26 +86,28 @@ typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp;
/* Unused formal parameter errors are removed using the following macro
* which is expected to have no bad effects on performance. Note that
* if you replace it with something other than whitespace, you must include
* the terminating semicolon.
* the terminating semicolon. Also note that some of these might not
* work when "param" is a structure, but that is never the case in libpng.
*/
#ifndef PNG_UNUSED
# define PNG_UNUSED(param) {if(param){}}
/* Other possiblities being discussed on png-mng-implement, Jan 2011 */
/* #define PNG_UNUSED(param) param = param; */ /* What we used before */
/* #define PNG_UNUSED(param) {(void)param;} */ /* Visual C complains */
/* #define PNG_UNUSED(param) if(param); */ /* gcc-4.2 complains */
/* #define PNG_UNUSED(param) if(param){} */
/* #define PNG_UNUSED(param) ((void)(param ? 0 : 0)); */ /* 0:0 might be seen */
/* #define PNG_UNUSED(param) {if(&param){}} */ /* gcc-4 complains */
/* #define PNG_UNUSED(param) {if(&param-&param){}} */ /* No comment. */
/*
* #if defined(__GNUC__) || defined(_MSC_VER)
* # define UNUSED(param) (void)param;
* #else
* # define UNUSED(param)
* #endif
*/
#endif
#define PNG_UNUSED(param) {if(param){}}
#if 0 /* Possibilities discussed on png-mng-implement, starting 27 Jan 2011 */
#ifndef PNG_UNUSED /* "best" but complex */
#if defined(__GNUC__) || defined(_MSC_VER)
# define PNG_UNUSED(param) (void)param;
#else
# define PNG_UNUSED(param)
#endif
#define PNG_UNUSED(param) param = param; /* What we used before */
#define PNG_UNUSED(param) {(void)param;} /* Visual C complains */
#define PNG_UNUSED(param) if(param); /* gcc-4.2 complains */
#define PNG_UNUSED(param) if(param){} /* more brackets nicer */
#define PNG_UNUSED(param) ((void)(param ? 0 : 0)); /* 0:0 might be seen */
#define PNG_UNUSED(param) {if(&param){}} /* gcc-4 complains */
#define PNG_UNUSED(param) {if(&param-&param){}} /* No comment. */
#define PNG_UNUSED(param) /* generates smallest (no) code but emits warning */
#endif /* 0 */
#endif /* PNG_UNUSED */
/* Just a little check that someone hasn't tried to define something
* contradictory.