[Bug c++/89722] [8/9 regression] strange warning: type qualifiers ignored on cast result type [-Wignored-qualifiers]

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89722

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2019-03-15
     Ever confirmed|0                           |1

--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Xavier from comment #9)
> We are compiling with -std=gnu++98 so decltype is not available there.

But __decltype is.

> And the "+ 0" trick does not seem to work correctly.

It will cause integer promotion for types with smaller rank than int.

> Do you have a solution that works with -std=gnu++98 ?

__decltype


But I think we want to suppress the warning for (__typeof__(expr))x
(we do still want to strip the qualifiers from the result type, just not warn).