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diff --git a/sys/sys/cdefs.h b/sys/sys/cdefs.h
--- a/sys/sys/cdefs.h
+++ b/sys/sys/cdefs.h
@@ -326,6 +326,17 @@
#if __GNUC_PREREQ__(3, 4)
#define __fastcall __attribute__((__fastcall__))
#define __result_use_check __attribute__((__warn_unused_result__))
+#ifdef __clang__
+/*
+ * clang and gcc have different semantics for __warn_unused_result__: the latter
+ * does not permit the use of a void cast to suppress the warning. Use
+ * __result_use_or_ignore_check in places where a void cast is acceptable.
+ * This can be implemented by [[nodiscard]] from C23.
+ */
+#define __result_use_or_ignore_check __result_use_check
+#else
+#define __result_use_or_ignore_check
+#endif /* !__clang__ */
#else
#define __fastcall
#define __result_use_check
diff --git a/sys/sys/systm.h b/sys/sys/systm.h
--- a/sys/sys/systm.h
+++ b/sys/sys/systm.h
@@ -299,10 +299,11 @@
void * _Nonnull __restrict kaddr, size_t len);
int __result_use_check copyin_nofault(const void * __restrict udaddr,
void * _Nonnull __restrict kaddr, size_t len);
-int copyout(const void * _Nonnull __restrict kaddr,
- void * __restrict udaddr, size_t len);
-int copyout_nofault(const void * _Nonnull __restrict kaddr,
+int __result_use_or_ignore_check copyout(const void * _Nonnull __restrict kaddr,
void * __restrict udaddr, size_t len);
+int __result_use_or_ignore_check copyout_nofault(
+ const void * _Nonnull __restrict kaddr, void * __restrict udaddr,
+ size_t len);
#ifdef SAN_NEEDS_INTERCEPTORS
int SAN_INTERCEPTOR(copyin)(const void *, void *, size_t);
@@ -323,11 +324,11 @@
int __result_use_check fueword(volatile const void *base, long *val);
int __result_use_check fueword32(volatile const void *base, int32_t *val);
int __result_use_check fueword64(volatile const void *base, int64_t *val);
-int subyte(volatile void *base, int byte);
-int suword(volatile void *base, long word);
-int suword16(volatile void *base, int word);
-int suword32(volatile void *base, int32_t word);
-int suword64(volatile void *base, int64_t word);
+int __result_use_or_ignore_check subyte(volatile void *base, int byte);
+int __result_use_or_ignore_check suword(volatile void *base, long word);
+int __result_use_or_ignore_check suword16(volatile void *base, int word);
+int __result_use_or_ignore_check suword32(volatile void *base, int32_t word);
+int __result_use_or_ignore_check suword64(volatile void *base, int64_t word);
uint32_t casuword32(volatile uint32_t *base, uint32_t oldval, uint32_t newval);
u_long casuword(volatile u_long *p, u_long oldval, u_long newval);
int casueword32(volatile uint32_t *base, uint32_t oldval, uint32_t *oldvalp,

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