[BUG] missing warning for pointer arithmetic out of bounds

[Alejandro Colomar via Gcc]

Hi!

For the following program:


    $ cat buf.c
    #include <stdio.h>

    int main(void)
    {
        char *p, buf[5];

        p = buf + 6;
        printf("%p\n", p);
    }


There are no warnings in gcc, as I would expect:

    $ gcc -Wall -Wextra buf.c -O0

Clang does warn, however:

    $ clang -Weverything -Wall -Wextra buf.c -O0

        printf("%p\n", p);
                ~~     ^
                %s

        p = buf + 6;
            ^     ~
    buf.c:5:2: note: array 'buf' declared here
        char *p, buf[5];
        ^
    2 warnings generated.

Cheers,

Alex


--
<http://www.alejandro-colomar.es/>

buf.c:8:17: warning: format specifies type 'void *' but the argument has type 'char *' [-Wformat-pedantic] buf.c:7:6: warning: the pointer incremented by 6 refers past the end of the array (that contains 5 elements) [-Warray-bounds-pointer-arithmetic]

OpenPGP_signature
Description: OpenPGP digital signature