No warning for module global variable which is set but never used

[webmaster]

Is it possible to request such feature?

Am 09.12.2020 um 16:45 schrieb webmaster:
> I have the following Code C\C++:
> 
> static int foo = 0;
> 
> static void bar(void)
> {
>     foo = 1;
> }
> 
> Here it is clear for the compiler that the variable foo can only be
> accessed from the same modul and not from ther modules. From the
> explanations before I understand that the variable is removed due to
> optimization. But I do not understand why GCC does not throws a warning.
> 
>>From my point of view it is responsibility of the developer to remove
> the unused variable.
>