[src/trunk]: src/sys/lib/libkern GCC 2.95 supports __builtin_ffs(); use it.

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

details:   https://anonhg.NetBSD.org/src/rev/c79301437576
branches:  trunk
changeset: 535525:c79301437576
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Wed Aug 21 01:27:58 2002 +0000

description:
GCC 2.95 supports __builtin_ffs(); use it.

diffstat:

 sys/lib/libkern/libkern.h |  6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diffs (21 lines):

diff -r 9eaed5580265 -r c79301437576 sys/lib/libkern/libkern.h
--- a/sys/lib/libkern/libkern.h Wed Aug 21 01:27:14 2002 +0000
+++ b/sys/lib/libkern/libkern.h Wed Aug 21 01:27:58 2002 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: libkern.h,v 1.40 2002/05/28 10:09:24 itojun Exp $      */
+/*     $NetBSD: libkern.h,v 1.41 2002/08/21 01:27:58 thorpej Exp $     */
 
 /*-
  * Copyright (c) 1992, 1993
@@ -286,8 +286,10 @@
 char   *strchr __P((const char *, int));
 char   *strrchr __P((const char *, int));
 
-/* This exists in GCC 3.x, but we don't bother (yet). */
 int     ffs __P((int));
+#if __GNUC_PREREQ__(2, 95)
+#define        ffs(x)                  __builtin_ffs(x)
+#endif
 
 void    __assert __P((const char *, const char *, int, const char *))
            __attribute__((__noreturn__));