[Bug c++/68257] Reject empty abi_tag attribute on inline namespace

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68257

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Stephan Bergmann from comment #3)
> Would that be considered something worthwhile to change, to only accept
> 
>   __attribute__((__abi_tag__))
> 
> but reject
> 
>   __attribute__((__abi_tag__()))
> 
> ?

GCC generally treats both forms the same, try any other attribute that accepts
zero arguments.