+/* We prefer the new C11-style atomic extension of GCC if available */
+#if defined(__ATOMIC_SEQ_CST) && !defined(__clang__)
+
+/* We use __atomic_load_4, so we rely on this being true */
+G_STATIC_ASSERT (sizeof (gint) == 4);
+
+#define g_atomic_int_get(atomic) \
+ (G_GNUC_EXTENSION ({ \
+ G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint)); \
+ (void) (0 ? *(atomic) ^ *(atomic) : 0); \
+ (gint) __atomic_load_4 ((atomic), __ATOMIC_SEQ_CST); \
+ }))
+#define g_atomic_int_set(atomic, newval) \
+ (G_GNUC_EXTENSION ({ \
+ G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint)); \
+ (void) (0 ? *(atomic) ^ (newval) : 0); \
+ __atomic_store_4 ((atomic), (newval), __ATOMIC_SEQ_CST); \
+ }))
+
+#if GLIB_SIZEOF_VOID_P == 8
+
+#define g_atomic_pointer_get(atomic) \
+ (G_GNUC_EXTENSION ({ \
+ G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer)); \
+ (gpointer) __atomic_load_8 ((atomic), __ATOMIC_SEQ_CST); \
+ }))
+#define g_atomic_pointer_set(atomic, newval) \
+ (G_GNUC_EXTENSION ({ \
+ G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer)); \
+ (void) (0 ? (gpointer) *(atomic) : 0); \
+ __atomic_store_8 ((atomic), (gsize) (newval), __ATOMIC_SEQ_CST); \
+ }))
+
+#else /* GLIB_SIZEOF_VOID_P == 8 */
+
+/* Assume that if GLIB_SIZEOF_VOID_P is not 8, it must be 4 */
+G_STATIC_ASSERT (sizeof (gpointer) == 4);
+
+#define g_atomic_pointer_get(atomic) \
+ (G_GNUC_EXTENSION ({ \
+ G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer)); \
+ (gpointer) __atomic_load_4 ((atomic), __ATOMIC_SEQ_CST); \
+ }))
+#define g_atomic_pointer_set(atomic, newval) \
+ (G_GNUC_EXTENSION ({ \
+ G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer)); \
+ (void) (0 ? (gpointer) *(atomic) : 0); \
+ __atomic_store_4 ((atomic), (gsize) (newval), __ATOMIC_SEQ_CST); \
+ }))
+
+#endif /* GLIB_SIZEOF_VOID_P == 8 */
+
+#else /* defined(__ATOMIC_SEQ_CST) */
+