On Mon, Dec 15, 2014 at 06:25:04PM +0100, Uros Bizjak wrote:
> Hello!
>
> Attached patch fixes PR 68323, where code tries to access what
> compiler think is out of bounds element.
>
> 2014-12-15 Uros Bizjak <ubiz...@gmail.com>
>
> PR libgcc/63832
> * crtstuff.c (__do_global_dtors_aux) [HIDDEN_DTOR_LIST_END]: Use
> func_ptr *dtor_list temporary variable to avoid "array subscript
> is above array bounds" warnings.
>
> Bootstrapped and regression tested on x86_64-linux-gnu {,m32} CentOS 5.11.
>
> OK for mainline?
Ok, thanks.
> Index: crtstuff.c
> ===================================================================
> --- crtstuff.c (revision 218733)
> +++ crtstuff.c (working copy)
> @@ -393,13 +393,11 @@ __do_global_dtors_aux (void)
> extern func_ptr __DTOR_END__[] __attribute__((visibility ("hidden")));
> static size_t dtor_idx;
> const size_t max_idx = __DTOR_END__ - __DTOR_LIST__ - 1;
> - func_ptr f;
> + func_ptr *dtor_list;
>
> + __asm ("" : "=g" (dtor_list) : "0" (__DTOR_LIST__));
> while (dtor_idx < max_idx)
> - {
> - f = __DTOR_LIST__[++dtor_idx];
> - f ();
> - }
> + dtor_list[++dtor_idx] ();
> }
> #else /* !defined (FINI_ARRAY_SECTION_ASM_OP) */
> {
Jakub
