Re: Warnings about hiding

[Simon Wright <simon@pushface.org>]

Adam Beneschan <adam@irvine.com> writes:

> On Oct 8, 5:47 am, Julian Leyh <jul...@vgai.de> wrote:
>> Hi,
>>
>> "-gnatwh" activates warnings on hiding declarations. But sometimes,
>> hiding is necessary.
>>
>> For example, consider this (Controlled type with it's own comparison
>> operator and finalize procedure, you can reproduce the errors using
>> these ads files):
>>
>> $ cat foo.ads
>> with Ada.Finalization;
>> package foo is
>>    type Foobar is new Ada.Finalization.Controlled with null record;
>>    function "=" (L,R : in Foobar) return Boolean;
>> private
>>    procedure Finalize (Object : in out Foobar);
>> end foo;
>> $ gnat -gnatwh -gnatc foo.ads
>> gcc -c -gnatwh -gnatc foo.ads
>> foo.ads:4:13: warning: declaration of "=" hides one in package
>> Standard
>> foo.ads:6:14: warning: declaration of "Finalize" hides one at line 3
>> $
>
> Well, I was going to suggest using the "overriding" keyword (not a bad
> idea anyway), but when I tried it, GNAT still displayed the warnings.
> Now *that* looks like a bug.  (I'm using 4.3.3; maybe it's been fixed
> in a later version)

Still there in GCC 4.5.0 & GNAT GPL 2010.