The branch main has been updated by andrew:
URL:
https://cgit.FreeBSD.org/src/commit/?id=a7ae78caaa17ff840da844c1dcaa780d194c9e20
commit a7ae78caaa17ff840da844c1dcaa780d194c9e20
Author: Andrew Turner <and...@freebsd.org>
AuthorDate: 2024-06-12 13:04:13 +0000
Commit: Andrew Turner <and...@freebsd.org>
CommitDate: 2024-06-12 13:04:13 +0000
cdefs: Add __writeonly to mark write only vars
When a variable in write only and can't be removed, e.g. for API
reasons, it is useful to document this fact similar to __diagused
and __witness_used.
Add __writeonly to tell the compiler and anyone looking at the code
that this variable is expected to only be written to, and to not
raise and error.
Reviewed by: imp, kib
Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D45561
---
sys/sys/cdefs.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/sys/sys/cdefs.h b/sys/sys/cdefs.h
index 037dfa55f923..c3268791787f 100644
--- a/sys/sys/cdefs.h
+++ b/sys/sys/cdefs.h
@@ -180,6 +180,7 @@
#define __aligned(x) __attribute__((__aligned__(x)))
#define __section(x) __attribute__((__section__(x)))
#endif
+#define __writeonly __unused
#if __GNUC_PREREQ__(4, 3) || __has_attribute(__alloc_size__)
#define __alloc_size(x) __attribute__((__alloc_size__(x)))
#define __alloc_size2(n, x) __attribute__((__alloc_size__(n, x)))
