GSoC project
Greeting to the team, I am Utkarsh Singh. I was going through various projects in the archive section of GSoC. I searched for some specific projects in Mathematics and C programming as I am most used with this field. I feel I can contribute to the organisation which is in turn contributing to the world. I wanted to know if the organisation has registered for GSoC 2021 and how I should start my contribution journey in GNU Compiler Collection. Thanks and Regards.
Re: GSoC project
Thanks, I'll check it out. On Mon, Feb 22, 2021 at 12:23 PM Ankur Saini wrote: > I think this is what you are looking for > > https://gcc.gnu.org/wiki/SummerOfCode > > > On 22-Feb-2021, at 12:08 PM, Utkarsh singh via Gcc > wrote: > > > > Greeting to the team, > > I am Utkarsh Singh. I was going through various projects in the > > archive section of GSoC. I searched for some specific projects in > > Mathematics and C programming as I am most used with this field. I feel I > > can contribute to the organisation which is in turn contributing to the > > world. I wanted to know if the organisation has registered for GSoC 2021 > > and how I should start my contribution journey in GNU Compiler > Collection. > > Thanks and Regards. > >
Problems in array access
Hello GCC mailing list,
In one of my friend's C programming class, they asked him a question on
the topic of array bounds based on the follwing code snippet:
#include
int main(void)
{
char str[] = {'G' , 'C' , 'C' };
str[3] = '\0' ; /* Isn't this invalid? */
printf("%s\n", str);
}
In an ideal case, str[3] should be a case of out-of-bound array access.
But when compiling the above with -Wall option flag GCC shows no
warning. So, am I missing something?
Thank you,
Utkarsh Singh
--
Utkarsh Singh
http://utkarshsingh.xyz
Re: Problems in array access
On 2021-08-31, 09:28 +0100, Jonathan Wakely wrote:
> On Tue, 31 Aug 2021 at 09:11, Utkarsh Singh wrote:
>>
>> Hello GCC mailing list,
>>
>> In one of my friend's C programming class, they asked him a question on
>> the topic of array bounds based on the follwing code snippet:
>>
>> #include
>>
>> int main(void)
>> {
>> char str[] = {'G' , 'C' , 'C' };
>> str[3] = '\0' ; /* Isn't this invalid? */
>> printf("%s\n", str);
>> }
>>
>> In an ideal case, str[3] should be a case of out-of-bound array access.
>> But when compiling the above with -Wall option flag GCC shows no
>> warning. So, am I missing something?
>
> This question belongs on the gcc-help mailing list, not here.
Sorry! I will keep this in mind.
> The code has undefined behaviour.
>
> Some GCC warnings depend on checks done during optimization. GCC will
> warn about this code if you use -Wall -O2 and you will get a runtime
> error if you compile with -fsanitize=undefined
Great! And thank you for a quick reply.
--
Utkarsh Singh
http://utkarshsingh.xyz
Re: Problems in array access
On 2021-08-31, 09:08 -0600, Martin Sebor wrote: > To refine Jonathan's answer: In cases where the index is constant > like this one the warning could be issued even with no optimization. > That it isn't is the result of the choice to depend on optimizations > unconditionally. It's worth revisiting this choice in the future. > If you would like to see such a change for -Warray-bounds (or any > other warning) please open requests in Bugzilla. Sure! Currently user account registration is restricted at Bugzilla, I will request it ASAP. -- Utkarsh Singh http://utkarshsingh.xyz
