Hi,
Christoph Lameter <[EMAIL PROTECTED]> writes:
> On Wed, 16 Jan 2008, Johannes Weiner wrote:
>
>> So if I got it right and you actually modify the memory you only got a
>> const pointer to, you reach a level where you _have to_ break this
>> policy and cast to a non-const pointer, as it is currently done in
>> kfree(). No?
>
> Correct and we have gcc 4.2 currently spitting out warnings because of
> casting to non const. Any idea how to convince gcc that this is okay?
Just for the record, this really seems to be a gcc bug, I can not
explain this otherwise:
$ cat test.c
#include <stdio.h>
static void test(void *p)
{
char *v = p;
puts(v);
}
int main(void)
{
const char foo[] = "foo";
test((void *)foo);
return 0;
}
$ gcc -Wall test.c -o test
$ gcc -Wall -O test.c -o test
test.c: In function 'main':
test.c:12: warning: passing argument 1 of 'test' discards qualifiers from
pointer target type
$ gcc -Wall -O -fno-inline test.c -o test
$
gcc is version 4.2.2.
Hannes
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
