https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58950
--- Comment #26 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #25)
> (In reply to Marc Glisse from comment #6)
> > For:
> >
> > void f(){
> > int i = 2;
> > (i+i);
> > }
>
> This case is fixed on the trunk:
>
> <source>: In function 'void f1()':
> <source>:9:5: warning: statement has no effect [-Wunused-value]
> 9 | (i+i);
> | ~~^~~
I think it was fixed via r12-1804-g65870e75616ee4359d1c13b99 .
