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[src/trunk]: src/sys/sys Use __builtin_offsetof if present for _DIRENT_NAMEOF...
details: https://anonhg.NetBSD.org/src/rev/106d21237087
branches: trunk
changeset: 765273:106d21237087
user: joerg <joerg%NetBSD.org@localhost>
date: Mon May 23 21:59:23 2011 +0000
description:
Use __builtin_offsetof if present for _DIRENT_NAMEOFF to avoid false
positives for uninitialized variable checks.
diffstat:
sys/sys/dirent.h | 6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)
diffs (22 lines):
diff -r 4bb740c22265 -r 106d21237087 sys/sys/dirent.h
--- a/sys/sys/dirent.h Mon May 23 21:52:54 2011 +0000
+++ b/sys/sys/dirent.h Mon May 23 21:59:23 2011 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: dirent.h,v 1.24 2008/03/15 19:02:49 christos Exp $ */
+/* $NetBSD: dirent.h,v 1.25 2011/05/23 21:59:23 joerg Exp $ */
/*-
* Copyright (c) 1989, 1993
@@ -83,8 +83,12 @@
* The _DIRENT_NAMEOFF macro returns the offset of the d_name field in
* struct dirent
*/
+#if __GNUC_PREREQ__(4, 0)
+#define _DIRENT_NAMEOFF(dp) __builtin_offsetof(struct dirent, d_name)
+#else
#define _DIRENT_NAMEOFF(dp) \
((char *)(void *)&(dp)->d_name - (char *)(void *)dp)
+#endif
/*
* The _DIRENT_RECLEN macro gives the minimum record length which will hold
* a name of size "namlen". This requires the amount of space in struct dirent
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