This is the mail archive of the
gcc@gcc.gnu.org
mailing list for the GCC project.
Re: Turning warning "returning reference to temporary" into error?
- From: dewar at gnat dot com (Robert Dewar)
- To: eyal at eyal dot emu dot id dot au, rguenth at tat dot physik dot uni-tuebingen dot de
- Cc: gcc at gcc dot gnu dot org
- Date: Mon, 12 May 2003 03:23:25 -0400 (EDT)
- Subject: Re: Turning warning "returning reference to temporary" into error?
> > Richard Guenther wrote:
> > > Wouldnt it be a good idea to at least turn the
> > > maybe_warn_about_returning_address_of_local warnings into an error with
> > > -pedantic? Or always?
> >
> > Let me show you an example where I use it. A function has a large object
> > on the stack which it initialises and returns the address of when called
> > for the first time.
> >
> > On a later call it checks how much of it was overwritten and returns
> > this
> > number of an estimate of how much stack was used suring the time since
> > the first call.
>
> You are relying on undefined behavior here, dont you?
Sure, that's true from a technical point of view, but in fact this seems a
quite reasonable approach which is likely to work with most compilers. Obviously
there is no legitimate way to do this computation :-)