------- Comment #24 from hjl dot tools at gmail dot com 2009-05-19 02:37
-------
(In reply to comment #23)
> Subject: Re: [4.5 Regression] Revision 147596 breaks bootstrap
>
> I still feel that if this patch is put in, we eventually will have the same
> discussion, as the compiler gets smarter about flow control and propigation,
This particular warning comes from front-end. I don't think front-end
will do such transformation.
> since semantically:
>
> if (test1)
> {
> if (test2)
> {
> /* ... */
> }
> }
>
> is the same as:
>
> if (test1 && test2)
> {
> /* ... */
> }
>
Gcc can eliminate many dead codes today. I don't think we will ever warn
any of them, if at all.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40172
