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Date: Fri, 02 Apr 2004 14:17:21 +0000
From: Jens Rehsack <rehsack@liwing.de>
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To: Rene Ladan <r.c.ladan@student.tue.nl>
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cc: freebsd-current@freebsd.org
Subject: Re: system's gcc bug?
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Rene Ladan wrote:
> 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);
>  }
> 
> ----------------
> 
> I'm running system's gcc on 5.2.1-release:
> 
>  Using built-in specs.
>  Configured with: FreeBSD/i386 system compiler
>  Thread model: posix
>  gcc version 3.3.3 [FreeBSD] 20031106
> 
> I have not yet mailed to the gcc developers, as the system gcc is
> somewhat patched. Neither have I filed a PR yet.

$ gcc -o test2 -W -O test2.c
test2.c: In function `main':
test2.c:6: warning: `i' might be used uninitialized in this function

Some warnings doesn't occur without using '-O', so the recommented 
compile may be 'gcc -W -Wall -O ...'

Furthermore it's never wrong using lint(1):
$ lint test2.c
test2.c:
test2.c(8): warning: i may be used before set [158]
stdio.h(76): warning: struct __sFILEX never defined [233]
lint: cannot find llib-lc.ln
Lint pass2:
printf used( test2.c(9) ), but not defined

Best regards,
Jens