TT#14008 use temporary variable to avoid stray compiler warning

The glib macro for g_atomic_pointer_get() uses typeof() with an
intermediate variable, resulting in a stray compiler warning if the
argument uses `const` as the intermediate variable also ends up being
const. Use an extra non-const intermediate variable to work around this.

closes #1270

Change-Id: I3bf1404240d3b8571aaf40c38b524f578e0fdbd9

include/aux.h

@@ -364,14 +364,16 @@ INLINE int bit_array_clear(volatile unsigned int *name, unsigned int bit) {
 #if GLIB_SIZEOF_VOID_P >= 8
 
 typedef struct {
-	volatile void *p;
+	void *p;
 } atomic64;
 
 INLINE uint64_t atomic64_get(const atomic64 *u) {
-	return (uint64_t) g_atomic_pointer_get(&u->p);
+	void **p = (void *) &u->p;
+	return (uint64_t) g_atomic_pointer_get(p);
 }
 INLINE uint64_t atomic64_get_na(const atomic64 *u) {
-	return (uint64_t) u->p;
+	void **p = (void *) &u->p;
+	return (uint64_t) *p;
 }
 INLINE void atomic64_set(atomic64 *u, uint64_t a) {
 	g_atomic_pointer_set(&u->p, (void *) a);
@@ -389,7 +391,7 @@ INLINE uint64_t atomic64_get_set(atomic64 *u, uint64_t a) {
 	uint64_t old;
 	do {
 		old = atomic64_get(u);
-		if (g_atomic_pointer_compare_and_exchange(&u->p, (volatile void *) old, (void *) a))
+		if (g_atomic_pointer_compare_and_exchange(&u->p, (void *) old, (void *) a))
 			return old;
 	} while (1);
 }