Date: Wed, 31 Mar 2004 12:20:35 +0200 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Rene Ladan <r.c.ladan@student.tue.nl> Cc: freebsd-current@freebsd.org Subject: Re: system's gcc bug? Message-ID: <9532.1080728435@critter.freebsd.dk> In-Reply-To: Your message of "Wed, 31 Mar 2004 12:18:34 %2B0200." <20040331101834.GA21652@dyn-099164.nbw.tue.nl>
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In message <20040331101834.GA21652@dyn-099164.nbw.tue.nl>, Rene Ladan writes:
>
>--rwEMma7ioTxnRzrJ
>Content-Type: text/plain; charset=us-ascii
>Content-Disposition: inline
>
>Hi,
>
>I'm getting runtime errors when executing the following program and
>declaring one of the arrays:
>
>----------------
>
>#include <stdio.h>
>
>int main(void) {
>/* int a[4] = { 0, 1, 2, 3 }; enable this line to get a buserror */
> int *i;
>/* int b[4] = { 0, 1, 2, 3 }; enable this line to get a segfault */
> for (*i = 0; *i < 4; (*i)++)
> printf("%p %i\n", i, *i);
> return(0);
> }
You have allocated no storage backing for *i, so your for loop writes
the integers 0...3 to a random place in memory.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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