* -Wall not detecting uninitialized variables
@ 2011-09-07 16:34 sudhakar govindavajhala
2011-09-07 16:37 ` Andrew Haley
0 siblings, 1 reply; 4+ messages in thread
From: sudhakar govindavajhala @ 2011-09-07 16:34 UTC (permalink / raw)
To: gcc-help
Hello all,
How come -Wall is not detecting unitialized variables?
Thanks,
Sudhakar
$cat test.c
#include <stdio.h>
int main() {
int i;
printf(" hi sud %d \n", i);
return 0;
}
$gcc --version
gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-48)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$gcc -Wall test.c
$g++ -Wall test.c
$
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: -Wall not detecting uninitialized variables
2011-09-07 16:34 -Wall not detecting uninitialized variables sudhakar govindavajhala
@ 2011-09-07 16:37 ` Andrew Haley
2011-09-07 16:44 ` Axel Freyn
0 siblings, 1 reply; 4+ messages in thread
From: Andrew Haley @ 2011-09-07 16:37 UTC (permalink / raw)
To: gcc-help
On 09/07/2011 05:34 PM, sudhakar govindavajhala wrote:
> #include <stdio.h>
>
> int main() {
> int i;
> printf(" hi sud %d \n", i);
> return 0;
>
> }
zebedee:~ $ gcc --version
gcc (GCC) 4.5.1 20100924 (Red Hat 4.5.1-4)
zebedee:~ $ gcc -Wall t.c
t.c: In function 'main':
t.c:5:15: warning: 'i' is used uninitialized in this function
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: -Wall not detecting uninitialized variables
2011-09-07 16:37 ` Andrew Haley
@ 2011-09-07 16:44 ` Axel Freyn
2011-09-08 2:48 ` sudhakar govindavajhala
0 siblings, 1 reply; 4+ messages in thread
From: Axel Freyn @ 2011-09-07 16:44 UTC (permalink / raw)
To: gcc-help
On Wed, Sep 07, 2011 at 05:36:50PM +0100, Andrew Haley wrote:
> On 09/07/2011 05:34 PM, sudhakar govindavajhala wrote:
> > #include <stdio.h>
> >
> > int main() {
> > int i;
> > printf(" hi sud %d \n", i);
> > return 0;
> >
> > }
>
> zebedee:~ $ gcc --version
> gcc (GCC) 4.5.1 20100924 (Red Hat 4.5.1-4)
>
> zebedee:~ $ gcc -Wall t.c
> t.c: In function 'main':
> t.c:5:15: warning: 'i' is used uninitialized in this function
gcc 4.1 warns if optimization is activated:
Jupiter:~ $ gcc-4.1 -Wall -O test.c
test.c: In function ‘main’:
test.c:5: warning: ‘i’ is used uninitialized in this function
Jupiter:~ $ gcc-4.1 --version
gcc-4.1 (GCC) 4.1.3 20080704 (prerelease) (Debian 4.1.2-29)
Axel
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: -Wall not detecting uninitialized variables
2011-09-07 16:44 ` Axel Freyn
@ 2011-09-08 2:48 ` sudhakar govindavajhala
0 siblings, 0 replies; 4+ messages in thread
From: sudhakar govindavajhala @ 2011-09-08 2:48 UTC (permalink / raw)
To: gcc-help
thank you.
On Wed, Sep 7, 2011 at 12:44 PM, Axel Freyn <axel-freyn@gmx.de> wrote:
> On Wed, Sep 07, 2011 at 05:36:50PM +0100, Andrew Haley wrote:
>> On 09/07/2011 05:34 PM, sudhakar govindavajhala wrote:
>> > #include <stdio.h>
>> >
>> > int main() {
>> > int i;
>> > printf(" hi sud %d \n", i);
>> > return 0;
>> >
>> > }
>>
>> zebedee:~ $ gcc --version
>> gcc (GCC) 4.5.1 20100924 (Red Hat 4.5.1-4)
>>
>> zebedee:~ $ gcc -Wall t.c
>> t.c: In function 'main':
>> t.c:5:15: warning: 'i' is used uninitialized in this function
>
> gcc 4.1 warns if optimization is activated:
> Jupiter:~ $ gcc-4.1 -Wall -O test.c
> test.c: In function ‘main’:
> test.c:5: warning: ‘i’ is used uninitialized in this function
>
> Jupiter:~ $ gcc-4.1 --version
> gcc-4.1 (GCC) 4.1.3 20080704 (prerelease) (Debian 4.1.2-29)
>
> Axel
>
^ permalink raw reply [flat|nested] 4+ messages in thread
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2011-09-07 16:34 -Wall not detecting uninitialized variables sudhakar govindavajhala
2011-09-07 16:37 ` Andrew Haley
2011-09-07 16:44 ` Axel Freyn
2011-09-08 2:48 ` sudhakar govindavajhala
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