Richard W.M. Jones wrote:
> Compiling libguestfs using gcc-4.6.0-0.11.fc15.x86_64 gives lots of:
>
> error: assuming signed overflow does not occur when changing X +- C1 cmp C2 to X cmp C1 +- C2 [-Werror=strict-overflow]
>
> These seem to be associated with code that does 'if (strcmp (s1, s2) == 0)'
>
> For example:
>
> dir.c: In function âdo_rm_rfâ:
> dir.c:59:7: error: assuming signed overflow does not occur when changing X +- C1 cmp C2 to X cmp C1 +- C2 [-Werror=strict-overflow]
>
> ----------------------------------------------------------------------
> int
> do_rm_rf (const char *path)
> {
> int r;
> char *buf, *err;
>
> if (STREQ (path, "/")) { <------ here
> reply_with_error ("cannot remove root directory");
> return -1;
> }
> ----------------------------------------------------------------------
>
> where STREQ is a simple macro:
>
> #define STREQ(a,b) (strcmp((a),(b)) == 0)
>
> AFAIK this code should be correct? I can't find anything at all about
> this specific error from Google.
Hi Rich,
I suspect that there was a problem with .11, perhaps one of these:
* Fri Mar 04 2011 Jakub Jelinek <jakub@xxxxxxxxxx> 4.6.0-0.12
- update from trunk
- PRs c++/46159, c++/46282, c++/47200, c++/47774, c++/47851, c++/47950,
c++/47974, c/47963, libstdc++/47913, middle-end/47283,
rtl-optimization/47925, target/47935, tree-optimization/47890
- rebuilt against ppl 0.11.2, reenable cloog-ppl Requires
because I can't reproduce that with the latest in rawhide,
gcc-4.6.0-0.12.fc15.x86_64:
$ cat k.c :
#define STREQ(a,b) (strcmp((a),(b)) == 0)
int
do_rm_rf (const char *path)
{
int r;
char *buf, *err;
if (STREQ (path, "/"))
{
reply_with_error ("cannot remove root directory");
return -1;
}
}
$ gcc -O3 -c k.c -Werror=strict-overflow :
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