[Bug c++/118392] "-w" fails to fully inhibit "'void a::b()' has not been declared within a" warning

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118392

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
There is auto_diagnostic_group but it looks like it is not working. 


      if (hidden_p)
        {
          auto_diagnostic_group d;
          pedwarn (DECL_SOURCE_LOCATION (decl), 0,
                   "%qD has not been declared within %qD", decl, scope);
          inform (DECL_SOURCE_LOCATION (found),
                  "only here as a %<friend%>");
        }