Added a PRIsize_t constant to help printing size_t without having to cast them to long long explicitely everywhere.

This commit was SVN r17626.

opal/include/opal_stdint.h

@@ -309,5 +309,17 @@ typedef unsigned long long uintptr_t;
 
 #endif
 
+#ifndef PRIsize_t
+# if defined(ACCEPT_C99)
+#   define PRIsize_t "zu"
+# elif SIZEOF_SIZE_T == SIZEOF_LONG
+#   define PRIsize_t "lu"
+# elif SIZEOF_SIZE_T == SIZEOF_LONG_LONG
+#   define PRIsize_t "llu"
+# elif SIZEOF_SIZE_T == SIZEOF_INT
+#   define PRIsize_t "u"
+# endif
+#endif 
+
 #endif /* OPAL_STDINT_H */