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Date: Wed, 8 Aug 2007 17:17:53 +0800
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
Message-ID: <20070808091752.GA5548@localhost.localdomain>
Reply-To: WANG Cong <xiyou.wangcong@gmail.com>
References: <20070806032659.GX21089@ftp.linux.org.uk> <Pine.LNX.4.64.0708061750270.13469@fbirervta.pbzchgretzou.qr>
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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.

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