On Wed, 20 Oct 2021 at 09:42, Jonathan Wakely wrote:
>
> On Wed, 20 Oct 2021 at 06:48, Tim Song wrote:
> >
> > On Tue, Oct 19, 2021 at 9:05 AM Jonathan Wakely via Gcc-patches
> > <gcc-patches@gcc.gnu.org> wrote:
> > >
> > > +constexpr bool
> > > +test_copy_elision()
> > > +{
> > > +  return true;
> > > +}
> > > +
> > > +static_assert( test_copy_elision() );
> > > +
> >
> > This isn't much of a test :)
>
> The ultimate copy elision. The copies even get removed from the source code.
>
> Thanks for spotting it. I meant to check we're constructing directly
> into the union member without materializing the temporary early. I'll
> add that today.

Fixed by the attached patch. Tested x86_64-linux, pushed to trunk.

Thanks again!