[PATCH v2 4/5] png2pnm: introduce an use PNGMINUS_UNUSED()

From: Christian Hesse <[email protected]>

PNG_UNUSED() is defined in pngpriv.h, which we do not want to include.
Instead define a new macro PNGMINUS_UNUSED() and use that.

Signed-off-by: Christian Hesse <[email protected]>
---
 contrib/pngminus/png2pnm.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/contrib/pngminus/png2pnm.c b/contrib/pngminus/png2pnm.c
index ae6f299cf..9414f2295 100644
--- a/contrib/pngminus/png2pnm.c
+++ b/contrib/pngminus/png2pnm.c
@@ -51,6 +51,16 @@
 #  define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
 #endif
 
+#ifndef PNGMINUS_UNUSED
+/* Unused formal parameter warnings are silenced using the following macro
+ * which is expected to have no bad effects on performance (optimizing
+ * compilers will probably remove it entirely).  Note that if you replace
+ * it with something other than whitespace, you must include the terminating
+ * semicolon.
+ */
+#  define PNGMINUS_UNUSED(param) (void)param;
+#endif
+
 /* function prototypes */
 
 int  main (int argc, char *argv[]);
@@ -443,7 +453,7 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file,
   if (png_pixels != (unsigned char*) NULL)
     free (png_pixels);
 
-  PNG_UNUSED(raw); /* to quiet a Coverity defect */
+  PNGMINUS_UNUSED(raw); /* to quiet a Coverity defect */
   return TRUE;
 
 } /* end of source */

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