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Fix Q_TOSTR(3) with GCC when it's called with first parameter being const.

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Discussed with:	cem
MFC after:	2 weeks
Sponsored by:	Klara Inc, Netflix
Differential Revision:	https://reviews.freebsd.org/D21766
This commit is contained in:
trasz 2019-09-28 09:54:03 +00:00
parent d046858b85
commit 4ed8c79723
1 changed files with 6 additions and 1 deletions
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7
sys/sys/qmath.h
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@ -58,11 +58,16 @@ typedef uint64_t u64q_t;
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))