* Frans Pop <[EMAIL PROTECTED]> [2007-11-21 17:47]:
> The most effective/efficient way to do this may be an archive rebuild with
> a modified gcc that emits a warning if this case is hit and then check build
> logs for the warning.
>
> Something like the patch below (stolen from the thread on linux-kernel).
Sounds like something Lucas (CCed) could do.
> --- trunk/gcc/fold-const.c 2007/11/17 13:46:53 130257
> +++ trunk/gcc/fold-const.c 2007/11/17 14:22:42 130258
> @@ -6095,6 +6095,9 @@
> }
> break;
> }
> + /* If the constant is negative, we cannot simplify this. */
> + if (tree_int_cst_sgn (c) == -1)
> + { warning(0, "Unpatched gcc miscompiles this"); break; }
> /* FALLTHROUGH */
> case NEGATE_EXPR:
> if ((t1 = extract_muldiv (op0, c, code, wide_type, strict_overflow_p))
--
Martin Michlmayr
http://www.cyrius.com/
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