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Index: head/sys/sys/qmath.h
===================================================================
--- head/sys/sys/qmath.h
+++ head/sys/sys/qmath.h
@@ -58,11 +58,16 @@
typedef s64q_t smaxq_t;
typedef u64q_t umaxq_t;
+#if defined(__GNUC__)
+/* Ancient GCC hack to de-const, remove when GCC4 is removed. */
+#define Q_BT(q) __typeof(1 * q)
+#else
/* The underlying base type of 'q'. */
#define Q_BT(q) __typeof(q)
+#endif
/* Type-cast variable 'v' to the same underlying type as 'q'. */
-#define Q_TC(q, v) ((Q_BT(q))(v))
+#define Q_TC(q, v) ((__typeof(q))(v))
/* Number of total bits associated with the data type underlying 'q'. */
#define Q_NTBITS(q) ((uint32_t)(sizeof(q) << 3))

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