Messages in this thread | | | Date | Wed, 8 Aug 2007 17:17:53 +0800 | From | WANG Cong <> | Subject | Re: [PATCH] take sched_debug.c out of nasal demon territory |
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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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