Adam Jackson wrote:
> On 3/7/11 10:35 AM, Richard W.M. Jones wrote:
>
>> Below is how the failure line expands(!)
>
> Thanks, I needed a laugh this morning.
>
> If I do this as a minimal testcase:
>
> ---
>
> #include <string.h>
> #include <stdio.h>
>
> int
> do_rm_rf (const char *path)
> {
> int r;
> char *buf, *err;
>
> if (!strcmp(path, "/")) {
> printf ("cannot remove root directory");
> return -1;
> }
>
> return 0;
> }
Shame on me.
I forgot string.h and -Wall ;-)
With the former and -O3, I do see your warning.
Here's a pared-down test case:
$ cat k.c
#include <string.h>
void do_rm_rf (const char *p) { if (strcmp (p, "/") == 0) return; }
$ gcc -Wall -O3 -c k.c -Werror=strict-overflow
k.c: In function âdo_rm_rfâ:
k.c:2:1678: error: assuming signed overflow does not occur when changing X +- C1 cmp C2 to X cmp C1 +- C2 [-Werror=strict-overflow]
cc1: some warnings being treated as errors
[Exit 1]
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