Re: [Bug c++/38759] New: Incorrect warning/error when compiling with a typedef'ed ptr return type

[Andrew Thomas Pinski <pinskia at gmail dot com>]

On Jan 7, 2009, at 12:44 PM, "gnu at bluedreamer dot com" <gcc-bugzilla@gcc.gnu.org 
> wrote:

> When a pointer to type is typedef'ed to a new type gcc incorrectly  
> warns about
> const modifier if new typedef is used in function return type.
>
> gcc info:
> dluadrianc:/home/adrianc> gcc -v
> Using built-in specs.
> Target: i686-pc-linux-gnu
> Configured with: ../gcc-4.3.1/configure --prefix=/usr --enable- 
> languages=c,c++
> --enable-shared --enable-threads=posix
> Thread model: posix
> gcc version 4.3.1 (GCC)
>
> Command line:g++ -save-temps -Wall -ansi -Wextra -pedantic -Werror  
> const.cc
> Error message:
> cc1plus: warnings being treated as errors
> const.cc:10: error: type qualifiers ignored on function return type
>
> Code
> # 1 "const.cc"
> # 1 "<built-in>"
> # 1 "<command-line>"
> # 1 "const.cc"
> class Foo { };
>
> const Foo *func1()
> {
>   return 0;
> }
>
> typedef Foo* Bar;
>
> const Bar func2()

The const here is applying to the pointer type and not what the  
pointer points to so the warning is correct.

> {
>   return 0;
> }
>
> int main(int , char *[])
> {
>   func1();
>   func2();
>
>   return 0;
> }
>
>
> --
>           Summary: Incorrect warning/error when compiling with a  
> typedef'ed
>                    ptr return type
>           Product: gcc
>           Version: 4.3.1
>            Status: UNCONFIRMED
>          Severity: minor
>          Priority: P3
>         Component: c++
>        AssignedTo: unassigned at gcc dot gnu dot org
>        ReportedBy: gnu at bluedreamer dot com
> GCC build triplet: i686-pc-linux-gnu
>  GCC host triplet: i686-pc-linux-gnu
> GCC target triplet: i686-pc-linux-gnu
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38759