[Bug c/80868] "Duplicate const" warning emitted in `const typeof(foo) bar;`

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80868

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mpolacek at gcc dot gnu.org

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
We're supposed to complain for

        const const int x;
and
        typedef const int t;
        const t x;

and I think we should thus also warn for this (-std=gnu89 -pedantic only).

        const int a;
        const __typeof(a) x;

because __typeof() doesn't strip outermost type qualifications.  There were
discussion about adding __nonqual_typeof() but that hasn't been added yet.