[src/trunk]: src/sys/sys Add __CTASSERT(x)

[matt <matt%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/2e5f0d4af0d8
branches:  trunk
changeset: 762306:2e5f0d4af0d8
user:      matt <matt%NetBSD.org@localhost>
date:      Sat Feb 19 02:01:46 2011 +0000

description:
Add __CTASSERT(x)

diffstat:

 sys/sys/cdefs.h |  9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diffs (23 lines):

diff -r 63495efb933a -r 2e5f0d4af0d8 sys/sys/cdefs.h
--- a/sys/sys/cdefs.h   Sat Feb 19 01:12:39 2011 +0000
+++ b/sys/sys/cdefs.h   Sat Feb 19 02:01:46 2011 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cdefs.h,v 1.82 2011/02/18 21:06:12 matt Exp $  */
+/*     $NetBSD: cdefs.h,v 1.83 2011/02/19 02:01:46 matt Exp $  */
 
 /*
  * Copyright (c) 1991, 1993
@@ -126,6 +126,13 @@
 #endif
 
 /*
+ * Compile Time Assertion.
+ */
+#define        __CTASSERT(x)           __CTASSERT0(x, __ctassert, __LINE__)
+#define        __CTASSERT0(x, y, z)    __CTASSERT1(x, y, z)
+#define        __CTASSERT1(x, y, z)    typedef char y ## z[(x) ? 1 : -1];
+
+/*
  * The following macro is used to remove const cast-away warnings
  * from gcc -Wcast-qual; it should be used with caution because it
  * can hide valid errors; in particular most valid uses are in