lib/posix: SPARC newlib has unsigned short mode_t

This commit eliminates a compilation error by passing int to va_arg
rather than mode_t on SPARC.

Newlib sys/_types.h defines mode_t for SPARC as:
  typedef unsigned short __mode_t;

GCC 10.2.0 gave the following error message and suggested solution:

mqueue.c: In function 'mq_open':
mqueue.c:61:21: error: 'mode_t' {aka 'short unsigned int'} is promoted
 to 'int' when passed through '...' [-Werror]
   61 |   mode = va_arg(va, mode_t);
      |                     ^
mqueue.c:61:21: note: (so you should pass 'int' not 'mode_t' {aka 'short
unsigned int'} to 'va_arg')

Signed-off-by: Martin Åberg <[email protected]>

Author: tbr-tt

lib/posix/mqueue.c

@@ -38,6 +38,17 @@ static int receive_message(mqueue_desc *mqd, char *msg_ptr, size_t msg_len,
 			   k_timeout_t timeout);
 static void remove_mq(mqueue_object *msg_queue);
 
+#if defined(__sparc__)
+/*
+ * mode_t is defined as "unsigned short" on SPARC newlib. This type is promoted
+ * to "int" when passed through '...' so we should pass the promoted type to
+ * va_arg().
+ */
+#define PROMOTED_MODE_T int
+#else
+#define PROMOTED_MODE_T mode_t
+#endif
+
 /**
  * @brief Open a message queue.
  *
@@ -58,7 +69,7 @@ mqd_t mq_open(const char *name, int oflags, ...)
 
 	va_start(va, oflags);
 	if ((oflags & O_CREAT) != 0) {
-		mode = va_arg(va, mode_t);
+		mode = va_arg(va, PROMOTED_MODE_T);
 		attrs = va_arg(va, mq_attr*);
 	}
 	va_end(va);