From: WANG Cong <xiyou.wangcong@gmail.com>
To: Jan Engelhardt <jengelh@computergmbh.de>
Cc: Al Viro <viro@ftp.linux.org.uk>,
Linus Torvalds <torvalds@linux-foundation.org>,
mingo@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] take sched_debug.c out of nasal demon territory
Date: Wed, 8 Aug 2007 17:17:53 +0800 [thread overview]
Message-ID: <20070808091752.GA5548@localhost.localdomain> (raw)
In-Reply-To: <Pine.LNX.4.64.0708061750270.13469@fbirervta.pbzchgretzou.qr>
On Mon, Aug 06, 2007 at 05:51:29PM +0200, Jan Engelhardt wrote:
>
>On Aug 6 2007 04:26, Al Viro wrote:
>>
>> C99 6.10.3[11]: preprocessing directive within the argument list
>>of macro invocation => undefined behaviour. Don't do that...
>
>String concatenation ("a" "b") is not a preprocessing directive.
>
>$ gcc -E test.c
># 1 "test.c"
># 1 "<built-in>"
># 1 "<command line>"
># 1 "test.c"
>printf("a" "b");
>
>(If it was, the "a" "b" would have already been joined.)
>
Yes. According to C99 5.1.1.2, string concatenation is done in Phase 6,
that's after preprocessing.
Regards.
--
_ /|
\'o.O'
=(___)=
U ack!
prev parent reply other threads:[~2007-08-08 9:17 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-06 3:26 Al Viro
2007-08-06 15:51 ` Jan Engelhardt
2007-08-06 17:05 ` Al Viro
2007-08-08 9:17 ` WANG Cong [this message]
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