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[src/trunk]: src/sys/sys Add comments explaining what __unused and __used are...
details: https://anonhg.NetBSD.org/src/rev/9c2a3b87a418
branches: trunk
changeset: 790846:9c2a3b87a418
user: apb <apb%NetBSD.org@localhost>
date: Fri Oct 25 08:47:30 2013 +0000
description:
Add comments explaining what __unused and __used are for.
diffstat:
sys/sys/cdefs.h | 11 ++++++++++-
1 files changed, 10 insertions(+), 1 deletions(-)
diffs (31 lines):
diff -r 3b9cece79cad -r 9c2a3b87a418 sys/sys/cdefs.h
--- a/sys/sys/cdefs.h Fri Oct 25 08:19:46 2013 +0000
+++ b/sys/sys/cdefs.h Fri Oct 25 08:47:30 2013 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: cdefs.h,v 1.113 2013/10/16 19:31:43 christos Exp $ */
+/* $NetBSD: cdefs.h,v 1.114 2013/10/25 08:47:30 apb Exp $ */
/*
* Copyright (c) 1991, 1993
@@ -250,12 +250,21 @@
#define __noclone /* nothing */
#endif
+/*
+ * __unused: Note that variable might be unused.
+ * Do not warn if variable is unused.
+ */
#if __GNUC_PREREQ__(2, 7)
#define __unused __attribute__((__unused__))
#else
#define __unused /* delete */
#endif
+/*
+ * __used: Note that variable is needed, even if it appears to be unused.
+ * Valid only for static variables. Do not optimise variable away.
+ * Do not warn if variable is unused.
+ */
#if __GNUC_PREREQ__(3, 1)
#define __used __attribute__((__used__))
#else
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