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src/common.h : Add macro UNUSED for marking function parameters as unused.

--- a/ChangeLog

+++ b/ChangeLog

@@ -1,3 +1,8 @@

+2009-11-29  Erik de Castro Lopo  <erikd AT mega-nerd DOT com>

+

+    * src/common.h

+    Add macro UNUSED for marking function parameters as unused.

+

 2009-10-07  Erik de Castro Lopo  <erikd AT mega-nerd DOT com>

     * tests/misc_test.c

--- a/src/common.h

+++ b/src/common.h

@@ -46,6 +46,18 @@

 #define	MAKE_MAGIC(a,b,c,d,e,f)	((a) + ((b) << 4) + ((c) << 8) + ((d) << 12) + ((e) << 16) + ((f) << 20))

+/*

+** Inspiration : http://sourcefrog.net/weblog/software/languages/C/unused.html

+*/

+#ifdef UNUSED

+#elif defined (__GNUC__)

+#	define UNUSED(x) UNUSED_ ## x __attribute__ ((unused))

+#elif defined (__LCLINT__)

+#	define UNUSED(x) /*@unused@*/ x

+#else

+#	define UNUSED(x) x

+#endif

+

 #ifdef __GNUC__

 #	define WARN_UNUSED	__attribute__ ((warn_unused_result))

 #else