[PATCH][4.3] Deprecate -ftrapv

[Richard Guenther]

On Fri, 29 Feb 2008, Robert Dewar wrote:

> Richard Guenther wrote:
> > This is a request to depcrecate -ftrapv which has numerous problems
> > making it not work as expected since a long time.  As nobody seems
> > to have the energy to ensure it is working I propose to deprecate it
> > for GCC 4.3 to make it possible to remove it during 4.4 (and not
> > block removing libcall notes by it).
> 
> Seems a pity, this feature is really needed for Ada, which requires
> efficient overflow checking for signed arithmetic, and it seems
> useful for C, where signed overflow is undefined, and it would be
> nice to enable trapping.
> 
> Right now, Ada uses really horrible double length arithmetic to
> do trapping.
> 
> So I would hestitate to deprecate it so quickly

Maybe you should organize some resources to fix its implementation
then?

Richard.